CN112934640A - Passivation and dacromet composite treatment method for cast aluminum alloy for integrated stove gas valve - Google Patents
Passivation and dacromet composite treatment method for cast aluminum alloy for integrated stove gas valve Download PDFInfo
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- CN112934640A CN112934640A CN202110037647.1A CN202110037647A CN112934640A CN 112934640 A CN112934640 A CN 112934640A CN 202110037647 A CN202110037647 A CN 202110037647A CN 112934640 A CN112934640 A CN 112934640A
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- aluminum alloy
- gas valve
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- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 97
- 238000002161 passivation Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000002131 composite material Substances 0.000 title claims abstract description 37
- 238000000576 coating method Methods 0.000 claims abstract description 51
- 239000011248 coating agent Substances 0.000 claims abstract description 47
- 238000005238 degreasing Methods 0.000 claims abstract description 35
- 230000007797 corrosion Effects 0.000 claims abstract description 32
- 238000005260 corrosion Methods 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000005406 washing Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000001723 curing Methods 0.000 claims abstract description 18
- 238000001035 drying Methods 0.000 claims abstract description 16
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 150000001844 chromium Chemical class 0.000 claims abstract description 10
- 239000003513 alkali Substances 0.000 claims abstract description 7
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 238000002791 soaking Methods 0.000 claims abstract description 3
- 238000005422 blasting Methods 0.000 claims description 19
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 238000005488 sandblasting Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 4
- 239000004327 boric acid Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000003618 dip coating Methods 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- 238000009991 scouring Methods 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 239000001488 sodium phosphate Substances 0.000 claims description 4
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 4
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 4
- 229940103272 aluminum potassium sulfate Drugs 0.000 claims description 3
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 claims description 3
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 claims description 3
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 238000010828 elution Methods 0.000 claims description 2
- 239000013043 chemical agent Substances 0.000 claims 1
- 238000010411 cooking Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 74
- 230000000052 comparative effect Effects 0.000 description 21
- 239000000306 component Substances 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007865 diluting Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- RYZCLUQMCYZBJQ-UHFFFAOYSA-H lead(2+);dicarbonate;dihydroxide Chemical compound [OH-].[OH-].[Pb+2].[Pb+2].[Pb+2].[O-]C([O-])=O.[O-]C([O-])=O RYZCLUQMCYZBJQ-UHFFFAOYSA-H 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 238000006388 chemical passivation reaction Methods 0.000 description 1
- DQIPXGFHRRCVHY-UHFFFAOYSA-N chromium zinc Chemical compound [Cr].[Zn] DQIPXGFHRRCVHY-UHFFFAOYSA-N 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- NINOVVRCHXVOKB-UHFFFAOYSA-N dialuminum;dioxido(dioxo)chromium Chemical compound [Al+3].[Al+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O NINOVVRCHXVOKB-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
- B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
- B05D5/061—Special surface effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/10—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by other chemical means
- B05D3/102—Pretreatment of metallic substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/546—No clear coat specified each layer being cured, at least partially, separately
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/56—Treatment of aluminium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/78—Pretreatment of the material to be coated
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
- C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Treatment Of Metals (AREA)
Abstract
The invention discloses a passivation and dacromet composite treatment method for cast aluminum alloy for an integrated stove gas valve, which comprises the steps of firstly removing rust on the surface of the aluminum alloy gas valve, then carrying out alkali washing, degreasing and deoiling, and then washing with water to obtain a first pretreatment piece; soaking the pretreatment piece I in a trivalent chromium salt passivation solution for passivation, then washing with water, and then sealing with hot water and drying to obtain a pretreatment piece II; and finally, performing first Dacromet coating on the second pretreatment piece, heating, curing and cooling to obtain a first Dacromet treatment piece, performing second Dacromet coating, heating, curing and cooling to obtain a composite treatment piece with corrosion resistance and bright color. And (3) Dacromet spraying, heating, curing and cooling to obtain the composite treatment piece with corrosion resistance and uniform color. The coating film obtained by the composite passivation method achieves good corrosion resistance and meets the production requirements.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to a passivation and dacromet composite treatment method for cast aluminum alloy for an integrated stove gas valve.
Background
The integrated kitchen is a kitchen appliance developed for improving kitchen and home environment, integrates multiple functions of a range hood, a gas stove, a disinfection cabinet and the like, and has the advantages of space saving, good oil fume extraction effect, energy saving, low consumption, environmental protection and the like. The gas valve is used as a core component of the gas stove and plays the roles of opening or cutting off a gas source of the burner, opening or closing an ignition device, adjusting the output power of the burner and the like. The gas valve has a complex structure, so that the gas valve is generally cast and formed by aluminum alloy. The surface of the die-cast aluminum alloy part has casting special micropores, and some casting defects such as air holes, needle holes and the like, and if the surface protection treatment is not carried out, the aluminum alloy part can be corroded under the action of a corrosive medium. The corrosion of the gas valve not only affects the normal use of the kitchen range, but also brings safety hidden troubles. Therefore, the aluminum alloy gas valve has higher corrosion resistance requirements. According to the standard T/CNHA 1020-2019, after 24-hour neutral salt spray tests of metal parts such as a burner, a gas pipe chariot and a valve body assembly are carried out according to the QB/T3826-1999, the corrosion resistance grade is not lower than the grade 3 of the QB/T3832-1999 standard.
The passivation is a method for effectively improving the corrosion resistance of the aluminum alloy gas valve, and has wide application in industry. According to the method, the aluminum alloy gas valve is usually placed in a passivating solution to be soaked for a period of time, and then a layer of compact oxide film is generated on the surface of the aluminum alloy gas valve, and the oxide film can separate the aluminum alloy from an external corrosion medium and has good corrosion resistance. Also, the dacromet technique is a surface anticorrosion technique which is recently developed, and is substantially an anticorrosion coating layer mainly composed of zinc and aluminum chromate which is formed by dipping, brushing or spraying a zinc-chromium coating material on the surface of a steel part or member and baking the coating. The Dacromet coating has no hydrogen embrittlement, good permeability, can work for a long time under the condition of high temperature, has certain aesthetic degree, but has poor corrosion resistance, and limits the further application of the Dacromet coating.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a passivation and dacromet composite treatment method for cast aluminum alloy for an integrated stove gas valve, so that the aesthetic degree and the corrosion resistance of the surface after passivation treatment are improved.
The passivation and Dacromet composite treatment method of the cast aluminum alloy for the integrated stove gas valve is characterized by comprising the following steps of:
step 1: carrying out surface rust removal on the aluminum alloy gas valve to be treated, removing oxides on the surface of the aluminum alloy gas valve, and then washing with alkali, degreasing and degreasing, and then washing with water to obtain a first pretreatment piece;
step 2: soaking the pretreatment piece I in a trivalent chromium salt passivation solution for passivation, then washing with water, and then sealing with hot water and drying to obtain a pretreatment piece II;
and step 3: and carrying out first Dacromet coating on the second pretreatment piece, heating, curing and cooling to obtain a first Dacromet treatment piece, then carrying out second Dacromet coating, heating, curing and cooling to obtain the composite treatment piece with corrosion resistance and bright color.
The passivation and Dacromet composite treatment method of the cast aluminum alloy for the integrated stove gas valve is characterized in that in the step 1, shot blasting is adopted for surface rust removal, a shot blasting machine is used for shot blasting, shots are sprayed to the surface of the aluminum alloy gas valve from a nozzle of the shot blasting machine by means of compressed air, and rust and oxide skin are removed by means of the scouring force of the shots; the shot for shot blasting is quartz sand or steel shot, and the granularity of the shot is below 1.5 mm; the pressure of the compressed air is 0.3-0.5Mpa, the distance between the nozzle of the sand blasting machine and the surface of the aluminum alloy gas valve is 80-150mm, and the spraying angle is controlled within the range of 60-75 degrees.
The passivation and dacromet composite treatment method for the cast aluminum alloy for the integrated stove gas valve is characterized in that degreasing treatment is carried out by adopting degreasing liquid in an alkali-elution degreasing process in the step 1, wherein the degreasing liquid contains the following chemical components in mass concentration: 1-15g/L sodium carbonate and 5-8g/L sodium phosphate; when degreasing treatment is carried out by adopting degreasing liquid, the degreasing temperature is 55-65 ℃, and the degreasing time is 5-8 minutes.
The passivation and dacromet compound treatment method of the cast aluminum alloy for the integrated stove gas valve is characterized in that the step of washing in the step 1 is to wash the degreased aluminum alloy gas valve in a water tank at room temperature to remove residual chemical reagents and stains on the aluminum alloy gas valve so as to obtain a pure surface to be passivated of the aluminum alloy gas valve, and the washing time is 1-2 minutes.
The passivation and dacromet composite treatment method of the cast aluminum alloy for the integrated stove gas valve is characterized in that in the step 2, the trivalent chromium salt passivation solution contains the following chemical components in mass concentration: 10-30g/L of chromium sulfate, 10-20g/L of aluminum potassium sulfate, 1-5g/L of ammonium metavanadate and 5-10g/L of hydrochloric acid.
The passivation and dacromet composite treatment method for the cast aluminum alloy for the integrated stove gas valve is characterized in that in the step 2, the passivation temperature is between room temperature and 40 ℃, and the passivation time is 1-10 minutes, preferably 8-9 minutes; in the step 2, the temperature of hot water in hot water sealing treatment is 55-65 ℃, and the aluminum alloy gas valve is placed in the hot water for sealing treatment, wherein the treatment time is 30-60 seconds.
The passivation and dacromet compound treatment method for the cast aluminum alloy for the integrated stove gas valve is characterized in that the aluminum alloy gas valve subjected to hot water sealing treatment in the step 2 is placed in a drying box for rapid drying treatment, the drying treatment temperature is 35-45 ℃, and the drying treatment time is 80-120 seconds until the moisture on the surface of the aluminum alloy gas valve is removed.
The passivation and dacromet composite treatment method for the cast aluminum alloy for the integrated stove gas valve is characterized in that in the step 3, the coating adopted by the first dacromet coating and the coating adopted by the second dacromet coating are respectively composed of the following raw material components in percentage by mass: 15-30% of flaky zinc powder, 5-10% of flaky aluminum powder, 5-15% of ethylene glycol, 5-10% of chromic anhydride, 1-3% of boric acid, 2-4% of polyethylene glycol (molecular weight is 1000), and the balance of deionized water.
The passivation and dacromet composite treatment method for the cast aluminum alloy for the integrated stove gas valve is characterized in that in the first dacromet coating process and the second dacromet coating process in the step 3, dip-coating is carried out at normal temperature for 5-7 minutes.
The passivation and dacromet composite treatment method for the cast aluminum alloy for the integrated stove gas valve is characterized in that the heating curing process in the step 3 is as follows: drying at 70-80 deg.C for 8-10 min, heating to 300 deg.C at a rate of 9-13 deg.C/min, and curing for 20-40 min; the cooling temperature in step 3 is 30-40 ℃.
The beneficial effects obtained by the invention are as follows:
according to the passivation and Dacromet composite treatment method for the cast aluminum alloy for the integrated stove gas valve, chemical passivation and Dacromet coating are combined, the color of the aluminum alloy surface coating prepared by the method is uniform and bright, and the aluminum alloy surface coating has good corrosion resistance.
Drawings
Fig. 1 is a process flow of the cast aluminum alloy passivation and dacromet composite treatment method for the integrated cooker gas valve.
Detailed Description
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example 1:
a passivation and Dacromet composite treatment method for cast aluminum alloy for an integrated stove gas valve comprises the following steps (a process flow diagram is shown in figure 1):
step 1:
the surface rust removal is carried out on the aluminum alloy gas valve to be processed, shot blasting is carried out by a shot blasting machine, shot is sprayed to the surface of the aluminum alloy gas valve through a nozzle of the shot blasting machine by means of compressed air, and rust and oxide skin are made to fall off by the scouring force of the shot. The shot for shot blasting is steel shot, the granularity of the shot for shot blasting is below 1.5mm, the air pressure is 0.5Mpa, the distance between the nozzle of the sand blasting machine and the surface of the aluminum alloy gas valve is 100mm, and the injection angle is controlled to be 70o。
Then, carrying out alkali washing degreasing oil removal treatment on the aluminum alloy gas valve with the surface subjected to rust removal, and carrying out alkali washing degreasing by adopting degreasing liquid, wherein the degreasing liquid contains the following chemical components in mass concentration: 10g/L of sodium carbonate, 6g/L of sodium phosphate and water as a solvent. The degreasing temperature is 60 ℃ and the degreasing time is 5 minutes.
After the alkaline washing degreasing is finished, the aluminum alloy gas valve is placed in a water tank at room temperature for washing, and chemical reagents and stains remained on the aluminum alloy gas valve are removed, so that a pure surface to be passivated of the aluminum alloy gas valve is obtained, and the washing time is 1 minute.
Step 2:
preparing trivalent chromium salt passivation solution in advance, wherein the trivalent chromium salt passivation solution contains the following chemical components in mass concentration: 10g/L of chromium sulfate, 20g/L of aluminum potassium sulfate, 2.5g/L of ammonium metavanadate, 5g/L of hydrochloric acid and water as a solvent.
Mixing and diluting the prepared trivalent chromium salt passivation solution and deionized water according to the weight ratio of 1:4, and after diluting the prepared trivalent chromium salt passivation solution to 20% concentration, placing the aluminum alloy gas valve workpiece treated in the step 1 in the diluted trivalent chromium salt passivation solution for passivation treatment for 1 minute at room temperature; and (3) washing the passivated aluminum alloy gas valve workpiece for 1 minute at room temperature. And then hot water sealing treatment is carried out for 60s (the hot water temperature is 60 ℃), the aluminum alloy gas valve after sealing treatment is placed in a drying box for rapid drying treatment, the drying treatment temperature is 40 ℃, and the drying treatment time is 100 seconds until the moisture on the surface of the aluminum alloy gas valve is removed.
And step 3:
preparing a Dacromet coating, wherein the Dacromet coating comprises the following raw material components in percentage by mass: 30% of flake zinc powder, 5% of flake aluminum powder, 10% of ethylene glycol, 5% of chromic anhydride, 2% of boric acid, 2% of polyethylene glycol (molecular weight is 1000), and the balance of deionized water.
And (3) performing first dacromet coating on the aluminum alloy gas valve dried in the step (2), putting the aluminum alloy gas valve into the dacromet coating, dip-coating for 5 minutes at normal temperature, performing first heating and curing, wherein the heating and curing conditions are that the aluminum alloy gas valve is dried at the temperature of 80 ℃ for 8 minutes, then the temperature is increased to about 300 ℃ at the heating rate of 10 ℃/min, and the aluminum alloy gas valve is cured for 30 minutes, and then the aluminum alloy gas valve is cooled at the temperature of 30 ℃.
And then carrying out second Dacromet coating under the same treatment condition as the first Dacromet coating, then carrying out second heating and curing under the same treatment condition as the first heating and curing, and then cooling at 30 ℃ to obtain the composite treatment member.
Example 2:
the combined passivating and dacromet treatment method for the cast aluminum alloy for the integrated stove gas valve comprises the operation steps of repeating the step 1, wherein the difference is that the passivating treatment in the step 2 is carried out for 8 minutes, and the rest operation steps are the same as those in the step 1.
Comparative example 1:
the combined passivating and dacromet treating process for cast aluminum alloy for integrated gas valve includes the steps of repeating the operation in example 1, except that the steps 2 and 3 are not performed, and the other steps are the same as those in example 1.
The specific treatment method of comparative example 1 was as follows:
step 1:
aluminum alloy gas valve to be treated is shownAnd (3) surface rust removal, namely shot blasting is carried out by adopting a shot blasting machine, shot is sprayed to the surface of the aluminum alloy gas valve by virtue of compressed air through a nozzle of the shot blasting machine, and rust and oxide skin are removed by virtue of the scouring force of the shot. The shot for shot blasting is steel shot, the granularity of the shot for shot blasting is below 1.5mm, the air pressure is 0.5Mpa, the distance between the nozzle of the sand blasting machine and the surface of the aluminum alloy gas valve is 100mm, and the injection angle is controlled to be 70o。
Then, carrying out alkali washing degreasing oil removal treatment on the aluminum alloy gas valve with the surface subjected to rust removal, and carrying out alkali washing degreasing by adopting degreasing liquid, wherein the degreasing liquid contains the following chemical components in mass concentration: 10g/L of sodium carbonate, 6g/L of sodium phosphate and water as a solvent. The degreasing temperature is 60 ℃ and the degreasing time is 5 minutes.
After the alkaline washing degreasing is finished, the aluminum alloy gas valve is placed in a water tank at room temperature for washing, and chemical reagents and stains remained on the aluminum alloy gas valve are removed, so that a pure surface to be passivated of the aluminum alloy gas valve is obtained, and the treated piece is obtained after the washing time is 1 minute.
Comparative example 2:
the combined treatment method of the passivation and the dacromet of the cast aluminum alloy for the integrated cooker gas valve comprises the operation steps of repeating the step 1, wherein the difference is that the step 3 is not carried out, and the rest operation steps are the same as the step 1.
Comparative example 3:
the combined treatment method of the passivation and the dacromet of the cast aluminum alloy for the integrated cooker gas valve comprises the operation steps of repeating the step 2, wherein the difference is that the step 3 is not carried out, and the rest operation steps are the same as the step 2.
Comparative example 4:
the combined treatment method of the passivation and the dacromet of the cast aluminum alloy for the integrated cooker gas valve comprises the operation steps of repeating the step 1, wherein the difference is that the operation of the step 2 is not carried out, and the other operation steps are the same as the operation steps of the embodiment 1.
Comparative example 5:
the combined passivating and Dacromet treatment method for the cast aluminum alloy for the integrated stove gas valve comprises the operation steps of repeating the step 2, wherein the difference is that only the first Dacromet coating is carried out in the step 3 of the comparative example 5, and the second Dacromet coating is not carried out.
The specific processing method in step 3 of comparative example 5 was:
preparing a Dacromet coating, wherein the Dacromet coating comprises the following raw material components in percentage by mass: 30% of flake zinc powder, 5% of flake aluminum powder, 10% of ethylene glycol, 5% of chromic anhydride, 2% of boric acid, 2% of polyethylene glycol (molecular weight is 1000), and the balance of deionized water.
And (2) dip-coating the aluminum alloy gas valve in the Dacromet coating for 5 minutes at normal temperature, and then carrying out primary heating and curing under the conditions of drying at the temperature of 80 ℃ for 8 minutes, heating to about 300 ℃ at the heating rate of 10 ℃/min, curing for 30 minutes, and then cooling at the temperature of 30 ℃ to obtain a composite treatment piece, namely finishing the treatment. The remaining steps of comparative example 5 were the same as those of example 2.
Comparative example 6:
the combined passivating and dacromet treatment method for the cast aluminum alloy for the integrated stove gas valve comprises the operation steps of repeating the step 2, wherein the processing sequence of the step 2 and the step 3 is changed, the first time and the second time of coating of the dacromet are firstly carried out in a comparison example 6, and then passivation treatment is carried out, and the rest operation steps are the same as those in the step 2.
The aluminum alloy gas valves obtained by the treatment methods provided in examples 1-2 and comparative examples 1-6 through composite passivation were observed for color and uniformity, and then subjected to 48-hour neutral salt spray experiments according to QB/T3826-1999 standard, and the corrosion resistance of the gas valves in each group of processes was tested according to QB/T3832-1999 standard. The results are shown in table 1 below:
comparing the neutral salt spray test results of the aluminum alloy gas valves obtained in the comparative examples 1-2 and the comparative examples 1-4, the comparative examples 1 and 2 find that the corrosion resistance of the composite passive film obtained after the treatment by the treatment method provided by the invention meets the requirements, and meanwhile, a silvery white uniform film layer is generated on the surface of the aluminum alloy gas valve, so that the aesthetic degree is high. The corrosion resistance of example 2 is improved because the passivation time is increased from 1 minute to 8 minutes, which indicates that the passivation time reaches a better corrosion resistance effect at about 8 minutes. This was also verified by the test results of comparative example 2 and comparative example 3.
Compared with comparative examples 1, 2 and 4, the corrosion resistance of the aluminum alloy gas valve subjected to the passivation treatment or the dacromet treatment is improved, and the corrosion resistance effects of the passivation treatment and the dacromet treatment are demonstrated. Compared with the comparative example 2 and the example 1, the corrosion resistance grade is improved from 2 to 3, and the color is changed from silver gray to silver white, which shows that the composite treatment further improves the corrosion resistance and the aesthetic degree. The comparison between the comparative example 3 and the example 2 can also find that the corrosion resistance is reduced to 6.25 percent from 15.11 percent, the corrosion resistance grade is improved to 4 from 3, the color is changed from light blue to silver white, and whitening and brightening are carried out, and further verification shows that the composite treatment improves the corrosion resistance and the aesthetic degree.
Comparative example 2 and comparative example 5 found that the corrosion resistance of the composite treated member subjected to the secondary dacromet coating is significantly improved compared with the composite treated member subjected to only the primary dacromet coating, and the corrosion resistance rating is increased from 3 to 4, mainly because the primary coating dacromet coating cannot completely cover the surface of the part, the corrosion resistance is not strong, and the coverage rate of the secondary coating dacromet coating is higher and the corrosion resistance is stronger.
The comparison examples 2, 4 and 6 show that the Dacromet coating is performed after the passivation treatment, and the corrosion resistance effect is better than that of the Dacromet coating performed alone and that of the Dacromet coating performed after the passivation treatment, because the Dacromet coating is coated on the surface of the aluminum alloy through heating and curing, the coating is thicker, the passivation treatment reacts with the aluminum alloy to form a passivation film to increase the corrosion resistance, and the application of the passivation treatment after the Dacromet coating destroys the Dacromet coating to reduce the corrosion resistance of the aluminum alloy.
The statements in this specification merely set forth a list of implementations of the inventive concept and the scope of the present invention should not be construed as limited to the particular forms set forth in the examples.
Claims (10)
1. A passivation and Dacromet composite treatment method of cast aluminum alloy for an integrated stove gas valve is characterized by comprising the following steps:
step 1: carrying out surface rust removal on the aluminum alloy gas valve to be treated, removing oxides on the surface of the aluminum alloy gas valve, and then washing with alkali, degreasing and degreasing, and then washing with water to obtain a first pretreatment piece;
step 2: soaking the pretreatment piece I in a trivalent chromium salt passivation solution for passivation, then washing with water, and then sealing with hot water and drying to obtain a pretreatment piece II;
and step 3: and carrying out first Dacromet coating on the second pretreatment piece, heating, curing and cooling to obtain a first Dacromet treatment piece, then carrying out second Dacromet coating, heating, curing and cooling to obtain the composite treatment piece with corrosion resistance and bright color.
2. The passivation and dacromet composite treatment method of the cast aluminum alloy for the integrated stove gas valve as recited in claim 1, wherein the surface rust removal in step 1 is performed by shot blasting, shot blasting is performed by using a shot blasting machine, shot is ejected from a nozzle of the sand blasting machine to the surface of the aluminum alloy gas valve by means of compressed air, and rust and scale are removed by the scouring force of the shot; the shot for shot blasting is quartz sand or steel shot, and the granularity of the shot is below 1.5 mm; the pressure of the compressed air is 0.3-0.5Mpa, the distance between the nozzle of the sand blasting machine and the surface of the aluminum alloy gas valve is 80-150mm, and the spraying angle is controlled within the range of 60-75 degrees.
3. The passivation and dacromet composite treatment method for the cast aluminum alloy for the integrated stove gas valve as recited in claim 1, wherein the degreasing treatment is performed by using degreasing liquid in the alkali-elution degreasing process in step 1, wherein the degreasing liquid comprises the following chemical components in mass concentration: 1-15g/L sodium carbonate and 5-8g/L sodium phosphate; when degreasing treatment is carried out by adopting degreasing liquid, the degreasing temperature is 55-65 ℃, and the degreasing time is 5-8 minutes.
4. The passivation and dacromet compound treatment method of the cast aluminum alloy for the integrated stove gas valve as recited in claim 1, wherein the step of washing in step 1 is to wash the degreased aluminum alloy gas valve in a water tank at room temperature to remove the chemical agent and stain remained on the aluminum alloy gas valve to obtain the pure surface to be passivated of the aluminum alloy gas valve, and the washing time is 1-2 minutes.
5. The passivation and dacromet composite treatment method for the cast aluminum alloy for the integrated stove and gas valve as recited in claim 1, wherein the trivalent chromium salt passivation solution in the step 2 comprises the following chemical components in mass concentration: 10-30g/L of chromium sulfate, 10-20g/L of aluminum potassium sulfate, 1-5g/L of ammonium metavanadate and 5-10g/L of hydrochloric acid.
6. The passivation and dacromet composite treatment method for the cast aluminum alloy for the integrated stove gas valve as claimed in claim 1, wherein the passivation temperature in the step 2 is between room temperature and 40 ℃, and the passivation time is 1-10 minutes, preferably 8-9 minutes; in the step 2, the temperature of hot water in hot water sealing treatment is 55-65 ℃, and the aluminum alloy gas valve is placed in the hot water for sealing treatment, wherein the treatment time is 30-60 seconds.
7. The passivation and dacromet compound treatment method of the cast aluminum alloy for the integrated cooker gas valve as recited in claim 1, wherein the aluminum alloy gas valve after hot water sealing treatment in step 2 is placed in a drying box for rapid drying treatment at a temperature of 35-45 ℃ for 80-120 seconds until the moisture on the surface of the aluminum alloy gas valve is removed.
8. The passivation and dacromet composite treatment method for the cast aluminum alloy for the integrated stove gas valve as recited in claim 1, wherein in the step 3, the coating for the first dacromet coating and the coating for the second dacromet coating are respectively composed of the following raw material components by mass percent: 15-30% of flaky zinc powder, 5-10% of flaky aluminum powder, 5-15% of ethylene glycol, 5-10% of chromic anhydride, 1-3% of boric acid, 2-4% of polyethylene glycol (molecular weight is 1000), and the balance of deionized water.
9. The passivation and dacromet composite treatment method of the cast aluminum alloy for the integrated cooker gas valve as recited in claim 1, wherein in the first dacromet coating process and the second dacromet coating process in step 3, dip coating is performed at normal temperature for 5-7 minutes.
10. The passivation and dacromet composite treatment method for the cast aluminum alloy for the integrated cooking gas valve as claimed in claim 1, wherein the heating curing process in the step 3 is as follows: drying at 70-80 deg.C for 8-10 min, heating to 300 deg.C at a rate of 9-13 deg.C/min, and curing for 20-40 min; the cooling temperature in step 3 is 30-40 ℃.
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| CN118596049A (en) * | 2024-08-02 | 2024-09-06 | 江苏英达机械有限公司 | Aluminum alloy surface shot peening metal coating equipment |
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