CN101298677A - Preparation of wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface - Google Patents
Preparation of wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface Download PDFInfo
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- CN101298677A CN101298677A CNA2008100502591A CN200810050259A CN101298677A CN 101298677 A CN101298677 A CN 101298677A CN A2008100502591 A CNA2008100502591 A CN A2008100502591A CN 200810050259 A CN200810050259 A CN 200810050259A CN 101298677 A CN101298677 A CN 101298677A
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Abstract
The invention discloses a preparation method of a composite nano plating layer formed on the surface of a magnesium alloy and has wear and corrosion resistance, and relates to a modification technique of the surface of the magnesium alloy. The preparation method of the composite nano plating layer takes caustic wash, acid wash and activation as preprocessing techniques, and adopts a chemical plating solution which takes a nickel salt as a main salt so as to firstly form a compact chemical plating layer on the surface of a magnesium alloy substrate, a watt plating solution is adopted as a plating solution for electric depositing, and according to the design requirements, a certain amount of nano materials are added into the plating solution, thus forming a composite nano plating solution for electric depositing. After the composite nano plating solution for electric depositing is evenly mixed, a magnesium alloy sample passing through chemical plating is placed into the composite nano plating solution for electric depositing and composite nano plating with electric depositing is implemented. By adopting technique parameters that are optimized by an orthogonal test, a composite surface plating layer with compact constitution and excellent performance is prepared on the surface of the magnesium alloy. The preparation method of the composite nano plating layer takes a chemical nickel plate as a base layer and adopts the electric depositing method for preparing the composite nano plating layer on the surface of the magnesium alloy, thus having stable techniques, high hardness of the plating layer, good wear and corrosion resistance, and important promoter action to the popularization and application of the magnesium alloy.
Description
Technical field
The present invention relates to a kind of Magnesiumalloy surface modifying technology,, improve the wear resistance and the solidity to corrosion of Mg alloy surface by preparing nanometer composite layer at Mg alloy surface.This technology belongs to the composite surface material field.
Background technology
Magnesium alloy is a structural metallic materials the lightest in the practical application.The industrialized development of magnesium alloy in recent years is very fast, because its plurality of advantages and by the title titled with " time substituting metal " and " 21 century metal ", being used widely in fields such as aerospace, automotive industry and telecommunications.Excellent specific properties such as magnesium alloy has that specific tenacity height, specific rigidity height, electromagnetic wave shielding are good, noise reduction vibration damping, machinability are good, recyclable utilization, today of, environmental protection energy-saving and cost-reducing and saving earth limited resources in an urgent demand, widely popularize the application magnesium alloy, have important economic implications and long-range social benefit.
The weak point of magnesium alloy is that its chemical property is extremely active, and very easily oxidation in air generates loose oxide film, and this layer oxide film do not have provide protection to magnesium alloy substrate, so its solidity to corrosion is poor; In addition, the hardness of magnesium alloy is lower, thereby its wear resistance is also poor.This two aspects drawbacks limit the use of magnesium alloy.
For solidity to corrosion and the wear resistance that improves magnesium alloy, must carry out surface modification to it.Prevent that its burn into from improving effective, the easiest method of its wear resistance is coating to be carried out on its surface handle, the barrier that utilizes coating to form between matrix and external environment suppresses the corrosion and the wearing and tearing of magnesium alloy materials.Can play a good protection in order to ensure coating, require the necessary even compact of coating itself, and good with matrix bond.At present, the top coat that generally adopts both at home and abroad mainly comprises the plating, electroless plating, conversion film, anodic oxidation, hydrogenation film, organic coating, vapor deposition layer of Mg alloy surface etc.Wherein simple effective method is exactly by the metal or alloy of electrochemical method at magnesium alloy matrix surface plating one deck desired properties the most, promptly electroplates and electroless plating.
Along with the development of nanometer material science, people deepen constantly the physics of nanoparticle uniqueness and the understanding of chemical property.Nano material joined form nano-composite plate in the coating, because the premium properties of nano material, will produce material impact the hardness of composite deposite, wear-resisting and solidity to corrosion.
Up to now, Mg alloy surface is carried out electroless plating or galvanized research is a lot, also have electroless plating is carried out compound plating to Mg alloy surface with electroplating to combine, as national inventing patent (application number 200410018471.1) mention earlier with chemical Ni-plating layer make bottom, the electroplated zinc nickel alloy layer is that the top layer prepares the Mg alloy surface composite deposite, has obtained solidity to corrosion preferably.Compound plating is in electroless plating or electroplates a kind of process for treating surface that grows up on the basis, be meant and in plating bath, add other particle, in electroless plating or electroplating process with the metal common deposited, formation contains metal and other particulate composite deposit, to obtain excellent comprehensive performance more, the magnesium alloy nano chemical composite plating of mentioning as national inventing patent (application number 200510046679.9 and application number 200510107254.4), in chemical plating fluid, added nano powder exactly, gained coating hardness height, wear-resisting and solidity to corrosion good.Adopt at present chemical Ni-plating layer to make bottom, adopt the method for galvanic deposit to prepare Mg alloy surface nano-composite plate technology again to yet there are no report.
Summary of the invention
The preparation method who the purpose of this invention is to provide a kind of wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface, adopt chemical Ni-plating layer to make bottom, adopt the compound coating technology of galvanic deposit to plate the composite deposite that one deck contains nano particle again at Mg alloy surface, to improve hardness, wear resistance and the solidity to corrosion etc. of magnesium alloy, it is more widely used.
For achieving the above object, technical scheme of the present invention is:
A kind of preparation method of wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface, with alkali cleaning, pickling, activation is pre-treating technology, adopting then with single nickel salt is that the plating bath of main salt carries out electroless plating, at the chemical plating of magnesium alloy matrix surface formation one deck densification, the assurance magnesium alloy substrate does not react with electroplating solution and galvanic corrosion does not take place.Carry out the galvanic deposit nano composite plating at last, concrete technology is as follows:
A) pre-treatment:
Alkali cleaning: magnesium alloy sample is placed soda-wash solution soaking and washing after the heating, remove the greasy dirt of specimen surface;
Pickling: at room temperature place Acidwash solution to soak the magnesium alloy sample after the alkali cleaning, remove oxide compound and other metal dirt of specimen surface;
Activation: at room temperature the magnesium alloy sample after the pickling is placed and adopt hydrofluoric acid solution to soak, the containing chromium cpd and form one deck fluoride films of flush away specimen surface at specimen surface as the solution of activator;
B) electroless plating: the container that the chemical plating bath that disposes with single nickel salt, inferior sodium phosphate, sodium-acetate, hydrogen fluoride ammonia and hydrofluoric acid will be housed places thermostat water bath to be heated to 75-85 ℃, in water bath with thermostatic control, sample was immersed in the chemical plating fluid 10-30 minute, slowly at the uniform velocity stir simultaneously, form fine and close chemical plating at Mg alloy surface, after electroless plating finishes, sample is taken out, dry up after the flowing water flushing;
C) galvanic deposit nano composite plating:
Adopt the watt plating bath as the galvanic deposit plating bath, and in this plating bath, add the nano particle of the nano-titanium oxide of nano silicon oxide that particle diameter is 10-30nm or particle diameter 40-60nm, constitute the nano combined plating bath of galvanic deposit, after mixing, to put this nano combined plating bath into through the magnesium alloy sample of pre-treatment and electroless plating, connect power supply, carry out the galvanic deposit nano composite plating, the processing parameter that compound plating is adopted obtains through optimization of orthogonal test.
The said composite depositing process parameter that obtains through optimization of orthogonal test is: cathode current density is 30mAcm
-2, the pH value of plating bath is 5.0, bath temperature is 50 ℃.
Said soda-wash solution adopts NaOH and Na
3PO
412H
2The mixing solutions of O, solution ratio is: NaOH:45g/l, Na
3PO
412H
2O:10g/l.
Said Acidwash solution adopts CrO
3With HNO
3Mixing solutions, solution ratio is: CrO
3: 125g/l, HNO
3(70%V/V): 100ml/l.
Said employing hydrofluoric acid solution as the solution ratio of activated solution is: HF (40%V/V): 350ml/l.
The proportioning of said chemical plating bath is: NiSO
46H
2O:15g/l; Na
2HPO
2H
2O:14g/l; NaC
2H
3O
2: 13g/l; HF (40%V/V): 12ml/l; NH
4HF
2: 8g/l; Stablizer: 1mg/l; Use the ammonia water titration chemical plating fluid, making its pH value is 6.4.
Said employing watt plating bath is as the galvanic deposit plating bath, and its proportioning is: NiSO
46H
2O:280g/l; NiCl
26H
2O:40g/l; H
3BO
3: 35g/l; C
7H
5NO
3S:0.1-0.2g/l, bath pH value are 5.0.
In the nano composite plating process, adopt ultrasonic concussion to follow the mechanical stirring mode that plating bath is carried out uniform mixing.
Technique effect: compared with the prior art the present invention has following technological merit:
1, adopt chemical Ni-plating layer to make bottom, with guarantee magnesium alloy substrate not with subsequent process in electroplating solution react and galvanic corrosion do not take place.
2, add hardness and wear-resisting, the solidity to corrosion that nano particle has improved the Mg alloy surface composite deposite.
3, the surface modifying method that adopts electroless plating to combine with galvanic deposit makes that coating and basal body interface bond strength are higher, wear-resisting, solidity to corrosion is better; And can obtain thicker coating.
Description of drawings
Figure 1A Z91HP Mg alloy surface nanometer SiO
2The microscopic appearance of/Ni composite deposite.
Nanometer SiO in Fig. 2 galvanic deposit plating bath
2Content and AZ91HP Mg alloy surface galvanic deposit nanometer SiO
2The relation of/Ni composite deposite microhardness.
Nanometer SiO in Fig. 3 galvanic deposit plating bath
2Content and AZ91HP Mg alloy surface galvanic deposit nanometer SiO
2The relation (load 30N) of/Ni composite deposite polishing scratch width.
Fig. 4 AZ91HP magnesium alloy substrate, AZ91HP Mg alloy surface galvanic deposit nickel coating and AZ91HP Mg alloy surface galvanic deposit nanometer SiO
2/ Ni and nano-TiO
2The electrokinetic potential polarization curve of/Ni composite deposite in the saturated Mg of 3.0wt.%NaCl (OH) aqueous solution.
Fig. 5 AZ91HP Mg alloy surface nano-TiO
2The microscopic appearance of/Ni composite deposite.
Nano-TiO in Fig. 6 galvanic deposit plating bath
2Content and AZ91HP Mg alloy surface galvanic deposit nano-TiO
2The relation of/Ni composite deposite microhardness.
Nano-TiO in Fig. 7 galvanic deposit plating bath
2Content and AZ91HP Mg alloy surface galvanic deposit nano-TiO
2The relation (load 30N) of/Ni composite deposite polishing scratch width.
Embodiment
The invention will be further described below by embodiment.
With alkali cleaning, pickling, activation is pre-treating technology, adopt then with single nickel salt is the chemical plating fluid of main salt, form the electroless plating bottom of one deck densification at magnesium alloy matrix surface, guarantee that magnesium alloy substrate does not react with follow-up galvanic deposit plating bath and galvanic corrosion does not take place.Adopt the watt plating bath as the galvanic deposit plating bath,, in this plating bath, add the nano material of heterogeneity, different content, constitute the nano combined plating bath of galvanic deposit according to design requirements.After mixing, will put this nano combined plating bath into, carry out the galvanic deposit nano composite plating through the magnesium alloy sample of pre-treatment and electroless plating.Employing prepares the nano surface composite deposite of dense structure, excellent property through the processing parameter that optimization of orthogonal test obtains at Mg alloy surface.The optimal processing parameter that adopts is: cathode current density is 30mAcm
-2, the pH value of plating bath is 5.0, bath temperature is 50 ℃.Adopt nano silicon oxide (median size 20nm) and nano-titanium oxide (median size 50nm) second particle mutually as galvanic deposit Mg alloy surface composite deposite.In the nano composite plating process, adopt ultrasonic concussion to follow the mechanical stirring mode that plating bath is carried out uniform mixing.
Concrete steps are as follows:
1. obtain solution
The preparation of (1) alkali cleaning, pickling and activated solution
Soda-wash solution: adopt NaOH and Na
3PO
412H
2The mixing solutions of O is as soda-wash solution.With balance with NaOH and Na
3PO
412H
2O weighs up, then with deionized water with NaOH and Na
3PO
412H
2The O dissolving, solution ratio is: NaOH:45g/l, Na
3PO
412H
2O:10g/l.
Acidwash solution: adopt CrO
3With HNO
3Mixing solutions as Acidwash solution.With balance with CrO
3Weigh up, with graduated cylinder with HNO
3Measure, with deionized water with CrO
3Dissolving adds HNO again
3Solution ratio is: CrO
3: 125g/l, HNO
3(70%V/V): 100ml/l.
Activated solution: adopt hydrofluoric acid solution as activated solution.With plastic cylinder hydrofluoric acid is measured, add the deionized water obtain solution again, solution ratio is: HF (40%V/V): 350ml/l.
(2) preparation of chemical plating bath
With balance single nickel salt, inferior sodium phosphate, sodium-acetate, hydrogen fluoride ammonia are weighed up, hydrofluoric acid is measured, with single nickel salt, inferior sodium phosphate, sodium-acetate, the dissolving of hydrogen fluoride ammonia, add hydrofluoric acid again with deionized water with plastic cylinder.The proportioning of chemical plating bath is: NiSO
46H
2O:15g/l; Na
2HPO
2H
2O:14g/l; NaC
2H
3O
2: 13g/l; HF (40%V/V): 12ml/l; NH
4HF
2: 8g/l; Stablizer: 1mg/l.Use the ammonia water titration chemical plating fluid, making its pH value is 6.4.After having prepared plating bath, use vacuum filter to filter, to remove impurity.
The preparation of (3) galvanic deposit nanometer plating bath
Adopt the watt plating bath as the galvanic deposit plating bath.With balance single nickel salt, nickelous chloride, boric acid are weighed up, wetting agent is measured with graduated cylinder.With deionized water single nickel salt, nickelous chloride are dissolved; With the deionized water that boils boric acid is dissolved.The proportioning of plating bath is: NiSO
46H
2O:280g/l; NiCl
26H
2O:40g/l; H
3BO
3: 35g/l; C
7H
5NO
3S:0.1-0.2g/l.Elder generation, adds 100 times boiling water dissolving again, and boils for some time sodium lauryl sulphate furnishing pasty state with small amount of deionized water, adds in the plating bath while hot after the clarification, and carries out continuously stirring.After having prepared plating bath, use vacuum filter to filter, to remove impurity.Bath pH value is adjusted to 5.0.
Certain ingredients, certain amount of nano material are added in the galvanic deposit plating bath, adopt ultrasonic concussion to follow the continuous uniform mixing of mechanical stirring after 2 hours, make nano combined plating bath.
Plating bath prepares the back installing electrodes, can carry out the preparation of nano-composite coating.
2. technical process
Preparation technology's flow process of nano-composite coating is: sample preparation-pre-treatment (alkali cleaning, pickling, activation)-electroless plating-galvanic deposit nano composite plating.Each step all will wash 1 minute with flowing water after finishing, and purpose is to remove the residual solution of last process, in order to avoid influence next procedure.
Each step concrete operations is as follows:
(1) sample preparation: adopt wire cutting machine that magnesium alloy is cut into 55 * 10 * 10mm
3Sample.Use 240 respectively
#Waterproof abrasive paper, 600
#With 1000
#Abrasive paper for metallograph is roughly ground magnesium alloy sample, with 1500
#Abrasive paper for metallograph carries out fine grinding, to remove oxide film and other impurity on magnesium alloy sample surface.
(2) alkali cleaning: the container that soda-wash solution will be housed places thermostat water bath to be heated to 65 ℃, and magnesium alloy sample was placed the soda-wash solution soaking and washing 8 minutes, removes the greasy dirt of specimen surface.
(3) pickling: at room temperature place Acidwash solution to soak 40s the magnesium alloy sample after the alkali cleaning, remove oxide compound and other metal dirt of specimen surface.
(4) activation: at room temperature the magnesium alloy sample after the pickling is placed activated solution to soak 10 minutes, the containing chromium cpd and form one deck fluoride films at specimen surface of flush away specimen surface is to guarantee carrying out smoothly of electroless plating process.
(5) electroless plating: the container that chemical plating bath will be housed places thermostat water bath to be heated to 75-85 ℃.In water bath with thermostatic control, sample is hung on the copper wire, be immersed in the chemical plating fluid 10-30 minute, adopt stirrer to carry out slow mechanical stirring at the uniform velocity simultaneously, form fine and close chemical plating at Mg alloy surface, in follow-up galvanic deposit nano composite plating process, do not react and galvanic corrosion does not take place with electroplating solution to guarantee magnesium alloy.After electroless plating finishes, sample is taken out, flowing water flushing 1 minute is with hot blast drying.Sample is put into moisture eliminator preservation, standby.
(6) galvanic deposit nano composite plating: adopt the numerical control supersonic cleanser that nanometer galvanic deposit plating bath is carried out 50 ℃ water bath with thermostatic control.As anode, the ratio of cathodic to anodic area example is 1: 2 with sheet nickel.The sample of nickel pole plate and process pre-treatment and electroless plating is hung in the nanometer galvanic deposit plating bath, connect electrode, open electroplating power supply, cathode current density is transferred to 30mAcm
-2, the preparation of beginning Mg alloy surface galvanic deposit nano-composite plate.In electrodeposition process, follow churned mechanically mode to carry out the uniform mixing of plating bath with ultrasonic concussion.After 30 minutes, powered-down takes out sample from galvanic deposit nanometer plating bath, with flowing water flushing 1 minute, with hot blast drying, obtains densification, even, bright Mg alloy surface galvanic deposit nano-composite plate.
Embodiment 1:
With the AZ91HP magnesium alloy is research object, and magnesium alloy wire is cut into 55 * 10 * 10mm
3Sample, use 240 respectively
#Waterproof abrasive paper, 600
#With 1000
#Abrasive paper for metallograph is roughly ground magnesium alloy sample, with 1500
#Abrasive paper for metallograph carries out fine grinding, removes oxide film and other impurity on magnesium alloy sample surface.Place thermostat water bath to be heated to 65 ℃ in the container that soda-wash solution is housed, magnesium alloy sample was placed the soda-wash solution soaking and washing 8 minutes, remove the greasy dirt of specimen surface.At room temperature place Acidwash solution to soak 40s magnesium alloy sample then, remove oxide compound and other metal dirt of specimen surface.At room temperature magnesium alloy sample is placed activated solution to soak 10 minutes, the containing chromium cpd and form one deck fluoride films of flush away specimen surface at specimen surface.Place thermostat water bath to be heated to 82 ℃ in the container that chemical plating solution is housed.In water bath with thermostatic control, sample is hung on the copper wire, be immersed in the chemical plating fluid 20 minutes, adopt stirrer to carry out slowly at the uniform velocity mechanical stirring simultaneously, form fine and close chemical plating at Mg alloy surface.Sample is taken out, and flowing water flushing 1 minute is with hot blast drying.Adopt the numerical control supersonic cleanser that nanometer galvanic deposit plating bath is carried out 50 ℃ water bath with thermostatic control then.As anode, the ratio of cathodic to anodic area example is 1: 2 with sheet nickel.The sample of nickel pole plate and the processing of process electroless plating is hung on the SiO that contains median size 20nm
2In the particulate galvanic deposit plating bath, connect electrode, open electroplating power supply, cathode current density is transferred to 30mAcm
-2, the preparation of beginning Mg alloy surface galvanic deposit nano-composite plate.In electrodeposition process, follow churned mechanically mode to carry out the uniform mixing of plating bath with ultrasonic concussion.After 30 minutes, powered-down, with sample from galvanic deposit SiO
2Take out in the nano combined plating bath,,, obtain densification, even, bright Mg alloy surface galvanic deposit nanometer SiO with hot blast drying with flowing water flushing 1 minute
2Composite deposite (consulting Fig. 1).SiO
2Contain 10g/1 nanometer SiO in the nano combined plating bath
2The time, the hardness of nano-composite plate is the highest, wear resistance is best (consulting Fig. 2, Fig. 3).The erosion resistance of nano-composite plate is higher than magnesium alloy (consulting Fig. 4).
Embodiment 2:
Adopt the pre-treatment process identical with embodiment 1.The sample of nickel pole plate and process pre-treatment and electroless plating is hung on the TiO that contains median size 50nm
2In the particle galvanic deposit plating bath, connect electrode, open electroplating power supply, cathode current density is transferred to 30mAcm
-2, the preparation of beginning Mg alloy surface galvanic deposit nano-composite plate.In electrodeposition process, follow churned mechanically mode to carry out the uniform mixing of plating bath with ultrasonic concussion.After 30 minutes, powered-down, with sample from galvanic deposit TiO
2Take out in the nanometer plating bath,,, obtain densification, even, bright Mg alloy surface galvanic deposit nano-TiO with hot blast drying with flowing water flushing 1 minute
2Composite deposite (consulting Fig. 5).TiO
2Contain the 10g/l nano-TiO in the nano combined plating bath
2The time, the hardness of nano-composite plate is the highest, wear resistance is best (consulting Fig. 6, Fig. 7).The erosion resistance of nano-composite plate is higher than magnesium alloy (consulting Fig. 4).
Claims (8)
1, a kind of preparation method of wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface, it is characterized in that with alkali cleaning, pickling, activation be pre-treating technology, adopt then with single nickel salt is the chemical plating fluid of main salt, at first form the chemical plating of one deck densification at magnesium alloy matrix surface, carry out the galvanic deposit nano composite plating at last, concrete technology is as follows:
A) pre-treatment:
Alkali cleaning: magnesium alloy sample is placed soda-wash solution soaking and washing after the heating, remove the greasy dirt of specimen surface;
Pickling: at room temperature place Acidwash solution to soak the magnesium alloy sample after the alkali cleaning, remove oxide compound and other metal dirt of specimen surface;
Activation: at room temperature the magnesium alloy sample after the pickling is placed with the solution of hydrofluoric acid solution as activator and soak, the containing chromium cpd and form one deck fluoride films of flush away specimen surface at specimen surface;
B) electroless plating: the container that the chemical plating bath that disposes with single nickel salt, inferior sodium phosphate, sodium-acetate, hydrogen fluoride ammonia and hydrofluoric acid will be housed places thermostat water bath to be heated to 75-85 ℃, in water bath with thermostatic control, sample was immersed in the chemical plating fluid 10-30 minute, slowly at the uniform velocity stir simultaneously, form fine and close chemical plating at Mg alloy surface, after electroless plating finishes, sample is taken out, dry up after the flowing water flushing;
C) galvanic deposit nano composite plating:
Adopt the watt plating bath as the galvanic deposit plating bath, and to add particle diameter in this plating bath be that nano silicon oxide or the particle diameter of 10-30nm is the nano particle of the nano-titanium oxide of 40-60nm, constitute the nano combined plating bath of galvanic deposit, after mixing, to put this nano combined plating bath into through the magnesium alloy sample of pre-treatment and electroless plating, connect power supply, carry out the galvanic deposit nano composite plating, the optimized parameters that obtains through orthogonal test is adopted in compound plating.
2, by the preparation method of the described wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface of claim 1, it is characterized in that the said processing parameter that obtains through optimization of orthogonal test is: cathode current density is 30mAcm
-2, the pH value of plating bath is 5.0, bath temperature is 50 ℃.
3,, it is characterized in that said soda-wash solution adopts NaOH and Na by the preparation method of the described wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface of claim 1
3PO
412H
2The mixing solutions of O, solution ratio is: NaOH:45g/l, Na
3PO
412H
2O:10g/l.
4,, it is characterized in that said Acidwash solution adopts CrO by the preparation method of the described wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface of claim 1
3With HNO
3Mixing solutions, solution ratio is: CrO
3: 125g/l, HNO
3(70%V/V): 100ml/l.
5, by the preparation method of the described wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface of claim 1, it is characterized in that said employing hydrofluoric acid solution as the solution ratio of activated solution is: HF (40%V/V): 350ml/l.
6, by the preparation method of the described wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface of claim 1, it is characterized in that the proportioning of said chemical plating bath is: NiSO
46H
2O:15g/l; Na
2HPO
2H
2O:14g/l; NaC
2H
3O
2: 13g/l; HF (40%V/V): 12ml/l; NH
4HF
2: 8g/l; Stablizer: 1mg/l; Use the ammonia water titration chemical plating fluid, making its pH value is 6.4.
7, by the preparation method of the described wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface of claim 1, it is characterized in that said employing watt plating bath as the galvanic deposit plating bath, its proportioning is: NiSO
46H
2O:280g/l; NiCl
26H
2O:40g/l; H
3BO
3: 35g/l; C
7H
5NO
3S:0.1-0.2g/l, bath pH value are 5.0.
8, by the preparation method of the described wear resistant corrosion resistant nano-composite deposit on magnesium alloy surface of claim 1, it is characterized in that: in the nano composite plating process, adopt ultrasonic concussion to follow the mechanical stirring mode that plating bath is carried out uniform mixing.
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| CN112206782B (en) * | 2019-07-12 | 2023-11-14 | 南京理工大学 | Containing Ni/MnO 2 Catalyst chip with composite coating and preparation method thereof |
| CN110760916A (en) * | 2019-11-18 | 2020-02-07 | 和县科嘉阀门铸造有限公司 | Method for improving corrosion resistance of magnesium alloy valve |
| CN110760916B (en) * | 2019-11-18 | 2022-04-05 | 和县科嘉阀门铸造有限公司 | Method for improving corrosion resistance of magnesium alloy valve |
| CN116815167A (en) * | 2023-06-27 | 2023-09-29 | 湖南锦络电子股份有限公司 | Salt spray resistant nickel plating alloy and preparation method thereof |
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