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CN111545436A - Surface treatment process of high-strength steel part for large bending machine - Google Patents

Surface treatment process of high-strength steel part for large bending machine Download PDF

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Publication number
CN111545436A
CN111545436A CN202010409674.2A CN202010409674A CN111545436A CN 111545436 A CN111545436 A CN 111545436A CN 202010409674 A CN202010409674 A CN 202010409674A CN 111545436 A CN111545436 A CN 111545436A
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Prior art keywords
treatment
steel part
surface treatment
treatment process
strength steel
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CN202010409674.2A
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Chinese (zh)
Inventor
包燕平
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Taicang Xinxiang Metal Products Co ltd
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Taicang Xinxiang Metal Products Co ltd
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Priority to CN202010409674.2A priority Critical patent/CN111545436A/en
Publication of CN111545436A publication Critical patent/CN111545436A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14Processes, 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment 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
    • B05D3/02Pretreatment 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
    • B05D3/0254After-treatment
    • B05D3/0263After-treatment with IR heaters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00Pretreatment 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
    • B05D3/10Pretreatment 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
    • B05D3/101Pretreatment of polymeric substrate
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D123/00Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C09D123/02Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
    • C09D123/04Homopolymers or copolymers of ethene
    • C09D123/06Polyethene
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/02Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/61Additives non-macromolecular inorganic
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/63Additives non-macromolecular organic
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/65Additives macromolecular
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F17/00Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23FNON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F3/00Brightening metals by chemical means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2301/00Inorganic additives or organic salts thereof
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2320/00Organic additives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2507/00Polyolefins
    • B05D2507/02Polypropylene
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2508/00Polyesters
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08LCOMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00Polymer mixtures characterised by other features
    • C08L2205/03Polymer mixtures characterised by other features containing three or more polymers in a blend

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The surface treatment process of the high-strength steel part for the large-scale bending machine comprises the following steps: shot blasting, micro-humidification, polishing, rust treatment, surface grafting, surface coating treatment and drying to finish metal surface treatment. According to the surface treatment process of the high-strength steel component for the large bending machine, disclosed by the invention, the polishing solution is adopted to carry out chemical polishing treatment on the steel component, the production cost is reduced, meanwhile, the steel component is rusted, a foundation is laid for surface grafting treatment, and the silane coupling agent can be combined with oxides on the surface of the steel component and combined with the oxides through molecular force. Silane coupling agent combines through crystalline resin in with the coating again, through coupling agent connection effect the firm connection of coating on the steel member, boron carbide, silica, crystalline resin in the coating all can improve the hardness of steel member, strengthens the intensity of steel member, and simple process is stable, makes the steel member have fine wearability and intensity, has very strong practical value.

Description

Surface treatment process of high-strength steel part for large bending machine
Technical Field
The invention belongs to the technical field of metal processing, and particularly relates to a surface treatment process of a high-strength steel part for a large bending machine.
Background
The surface treatment is a process for artificially forming a surface layer with mechanical, physical and chemical properties different from those of a substrate on the surface of a substrate material. The purpose of the surface treatment is to meet the requirements of corrosion resistance, wear resistance, decoration or other special functions of the product. In order to remove various foreign matters (such as oil stain, rust, dust, old paint film and the like) adhered on the surface of an object and provide a good substrate suitable for the coating requirement so as to ensure that the coating film has good corrosion resistance, decorative performance and certain special functions, the surface of the object needs to be pretreated before coating.
In the existing technology, high requirements are put on the surface treatment of metal, in particular to the treatment of wear resistance, surface smoothness and mechanical strength, so that the metal member has stronger wear resistance and higher mechanical strength, but the method is far from sufficient in the prior art.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention aims to provide a surface treatment process of a high-strength steel part for a large bending machine.
The technical scheme is as follows: the invention provides a surface treatment process of a high-strength steel part for a large-scale bending machine, which comprises the following steps:
(1) performing shot blasting treatment on the surface of the steel part;
(2) carrying out micro-humidification treatment on the whole surface of the steel part subjected to shot blasting treatment in the step (1);
(3) polishing the steel part subjected to the micro-humidification treatment in the step (2) by using polishing liquid;
(4) carrying out rust treatment on the steel part polished in the step (3) to form a layer of uniformly distributed compounds on the surface of the steel part;
(5) carrying out surface grafting treatment on the steel part subjected to the embroidering treatment in the step (4);
(6) carrying out surface coating treatment on the steel member subjected to the surface grafting treatment in the step (5);
(7) and (4) drying the steel member subjected to the surface treatment in the step (6) to finish the metal surface treatment.
Further, according to the surface treatment process of the high-strength steel part for the large-scale bending machine, the polishing solution comprises, by mass, 20-30% of sulfuric acid, 40-60% of hydrogen peroxide and 30-40% of hydrochloric acid.
Further, in the surface treatment process of the high-strength steel component for the large bending machine, the polishing solution is used for soaking or spraying the steel component.
Further, in the surface treatment process of the high-strength steel part for the large-scale bending machine, the connecting agent used for the surface grafting treatment is a silane coupling agent.
Further, according to the surface treatment process of the high-strength steel part for the large bending machine, the coating used by the surface coating comprises the following components in percentage by mass: 10-15% of boron carbide, 10-20% of silicon dioxide, 20-30% of crystalline resin, 10-20% of lubricant, 1-3% of dispersant and 10-20% of curing agent.
Further, according to the surface treatment process of the high-strength steel part for the large-scale bending machine, the lubricant comprises 10-20% of silicone oil and 20-28% of fatty acid amide by mass percent.
Further, in the surface treatment process of the high-strength steel part for the large-scale bending machine, the drying is performed by infrared rays.
Further, in the surface treatment process of the high-strength steel part for the large-scale bender, the crystalline resin is one or a mixture of polypropylene and polyethylene terephthalate.
The technical scheme shows that the invention has the following beneficial effects: the surface treatment process of the high-strength steel component for the large bending machine, disclosed by the invention, has the advantages that the chemical polishing treatment is carried out on the steel component by adopting the polishing solution, the process is simple and easy to implement, the manual polishing manpower and material resources are reduced, the production cost is reduced, meanwhile, the rust treatment is carried out on the steel component, a foundation is laid for the surface grafting treatment, and the silane coupling agent can be combined with oxides on the surface of the steel component and is combined with the oxides through molecular force. Silane coupling agent combines through crystalline resin in with the coating again, through coupling agent connection effect the firm connection of coating on the steel member, boron carbide, silica, crystalline resin in the coating all can improve the hardness of steel member, strengthens the intensity of steel member, and simple process is stable, makes the steel member have fine wearability and intensity, has very strong practical value.
Detailed Description
The invention will be further illustrated by the following specific examples, which are given for the purpose of illustration only and are not intended to be limiting.
Example 1
The surface treatment process of the high-strength steel part for the large-scale bending machine comprises the following steps:
(1) performing shot blasting treatment on the surface of the steel part, and performing shot blasting treatment on the steel part by using shot blasting with the grain diameter of 0.3 mm;
(2) carrying out micro-humidification treatment on the whole surface of the steel part subjected to shot blasting treatment in the step (1);
(3) soaking and polishing the steel part subjected to the micro-humidification treatment in the step (2);
(4) carrying out rust treatment on the steel part polished in the step (3) to form a layer of uniformly distributed rust compound on the surface of the steel part;
(5) carrying out surface grafting treatment on the steel part subjected to the embroidering treatment in the step (4);
(6) carrying out surface coating treatment on the steel member subjected to the surface grafting treatment in the step (5);
(7) and (4) drying the steel member subjected to the surface treatment in the step (6) by using infrared rays to finish the metal surface treatment.
Wherein the polishing solution comprises 20% of sulfuric acid, 40% of hydrogen peroxide and 30% of hydrochloric acid by mass.
In addition, the connecting agent used for the surface grafting treatment is a KH550 silane coupling agent.
And the coating used for the surface coating comprises the following components in percentage by mass: 10% of boron carbide, 10% of silicon dioxide, 20% of crystalline resin, 10% of lubricant, 1% of dispersant and 10% of curing agent.
The lubricant comprises 10% of silicone oil and 20% of fatty acid amide by mass.
Further, the crystalline resin is polypropylene.
Example 2
The surface treatment process of the high-strength steel part for the large-scale bending machine comprises the following steps:
(1) performing shot blasting treatment on the surface of the steel part, and performing shot blasting treatment on the steel part by using shot blasting with the grain diameter of 0.3 mm;
(2) carrying out micro-humidification treatment on the whole surface of the steel part subjected to shot blasting treatment in the step (1);
(3) carrying out spraying and polishing treatment on the steel part subjected to the micro-humidification treatment in the step (2);
(4) carrying out rust treatment on the steel part polished in the step (3) to form a layer of uniformly distributed rust compound on the surface of the steel part;
(5) carrying out surface grafting treatment on the steel part subjected to the embroidering treatment in the step (4);
(6) carrying out surface coating treatment on the steel member subjected to the surface grafting treatment in the step (5);
(7) and (4) drying the steel member subjected to the surface treatment in the step (6) by using infrared rays to finish the metal surface treatment.
Wherein the polishing solution comprises 25% of sulfuric acid, 50% of hydrogen peroxide and 35% of hydrochloric acid by mass.
In addition, the connecting agent used for the surface grafting treatment is KH792 silane coupling agent.
And the coating used for the surface coating comprises the following components in percentage by mass: 12% of boron carbide, 15% of silicon dioxide, 25% of crystalline resin, 15% of lubricant, 2% of dispersant and 15% of curing agent.
The lubricant comprises 15% of silicone oil and 24% of fatty acid amide by mass. Further, the crystalline resin is a mixture of polypropylene and polyethylene terephthalate.
Example 3
The surface treatment process of the high-strength steel part for the large-scale bending machine comprises the following steps:
(1) performing shot blasting treatment on the surface of the steel part, and performing shot blasting treatment on the steel part by using shot blasting with the grain diameter of 0.3 mm;
(2) carrying out micro-humidification treatment on the whole surface of the steel part subjected to shot blasting treatment in the step (1);
(3) soaking and polishing the steel part subjected to the micro-humidification treatment in the step (2);
(4) carrying out rust treatment on the steel part polished in the step (3) to form a layer of uniformly distributed rust compound on the surface of the steel part;
(5) carrying out surface grafting treatment on the steel part subjected to the embroidering treatment in the step (4);
(6) carrying out surface coating treatment on the steel member subjected to the surface grafting treatment in the step (5);
(7) and (4) drying the steel member subjected to the surface treatment in the step (6) by using infrared rays to finish the metal surface treatment.
Wherein the polishing solution comprises 30% of sulfuric acid, 60% of hydrogen peroxide and 40% of hydrochloric acid by mass.
In addition, the connecting agent used for the surface grafting treatment is a DL602 silane coupling agent.
And the coating used for the surface coating comprises the following components in percentage by mass: 15% of boron carbide, 20% of silicon dioxide, 30% of crystalline resin, 20% of lubricant, 3% of dispersant and 20% of curing agent.
The lubricant comprises 20% of silicone oil and 28% of fatty acid amide by mass.
Further, the crystalline resin is a mixture of polypropylene and polyethylene terephthalate.
The surface treatment process for the steel member has the advantages of simple treatment process, low production cost, good lubrication effect and great improvement on the mechanical strength of the steel member, can replace the traditional treatment processes such as phosphorization and saponification, can be used for uniformly controlling the corrosion of the surface of the steel member, can also be used for finishing polishing treatment and modification treatment, and enhances the mechanical strength of the surface of the steel member.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims (8)

1. The surface treatment process of the high-strength steel part for the large-scale bending machine is characterized by comprising the following steps of: the method comprises the following steps:
(1) performing shot blasting treatment on the surface of the steel part;
(2) carrying out micro-humidification treatment on the whole surface of the steel part subjected to shot blasting treatment in the step (1);
(3) polishing the steel part subjected to the micro-humidification treatment in the step (2) by using polishing liquid;
(4) carrying out rust treatment on the steel part polished in the step (3) to form a layer of uniformly distributed compounds on the surface of the steel part;
(5) carrying out surface grafting treatment on the steel part subjected to the embroidering treatment in the step (4);
(6) carrying out surface coating treatment on the steel member subjected to the surface grafting treatment in the step (5);
(7) and (4) drying the steel member subjected to the surface treatment in the step (6) to finish the metal surface treatment.
2. The surface treatment process of the high-strength steel part for the large-scale bender according to claim 1, wherein: the polishing solution comprises, by mass, 20-30% of sulfuric acid, 40-60% of hydrogen peroxide and 30-40% of hydrochloric acid.
3. The surface treatment process of the high-strength steel part for the large-sized bender according to claim 2, wherein: the polishing solution is used for soaking or spraying the steel member.
4. The surface treatment process of the high-strength steel part for the large-scale bender according to claim 1, wherein: the connecting agent used for the surface grafting treatment is a silane coupling agent.
5. The surface treatment process of the high-strength steel part for the large-scale bender according to claim 1, wherein: the surface coating comprises the following coating materials in percentage by mass: 10-15% of boron carbide, 10-20% of silicon dioxide, 20-30% of crystalline resin, 10-20% of lubricant, 1-3% of dispersant and 10-20% of curing agent.
6. The surface treatment process of the high-strength steel part for the large-scale bender according to claim 5, wherein: the lubricant comprises 10-20% of silicone oil and 20-28% of fatty acid amide by mass percentage.
7. The surface treatment process of the high-strength steel part for the large-scale bender according to claim 5, wherein: the drying is infrared ray drying.
8. The surface treatment process of the high-strength steel part for the large-scale bender according to claim 5, wherein: the crystalline resin is one or a mixture of polypropylene and polyethylene terephthalate.
CN202010409674.2A 2020-05-15 2020-05-15 Surface treatment process of high-strength steel part for large bending machine Pending CN111545436A (en)

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