CN114657614A - Surface treatment process for aluminum alloy thin-wall die casting - Google Patents

Surface treatment process for aluminum alloy thin-wall die casting Download PDF

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Publication number
CN114657614A
CN114657614A CN202210352496.3A CN202210352496A CN114657614A CN 114657614 A CN114657614 A CN 114657614A CN 202210352496 A CN202210352496 A CN 202210352496A CN 114657614 A CN114657614 A CN 114657614A
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aluminum alloy
die casting
alloy thin
parts
wall die
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杉本润
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Meinuo Precision Auto Parts Nantong Co ltd
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Meinuo Precision Auto Parts Nantong Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C25D5/12—Electroplating with more than one layer of the same or of different metals at least one layer being of nickel or chromium
    • 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
    • C23C22/07—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 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/12—Orthophosphates containing zinc cations
    • C23C22/16—Orthophosphates containing zinc cations containing also peroxy-compounds
    • 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
    • C23C22/40—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 containing molybdates, tungstates or vanadates
    • C23C22/43—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 containing molybdates, tungstates or vanadates containing also hexavalent chromium compounds
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/12—Light metals
    • C23G1/125—Light metals aluminium
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

The invention discloses a surface treatment process of an aluminum alloy thin-wall die casting, which relates to the technical field of aluminum alloy die castings, and specifically comprises the following steps: s101: pre-treating; s102: acid washing; s103: washing with water; s104: degreasing; s105: phosphorization; s106: nickel plating; s107: galvanizing; s108: and (5) passivating. The process disclosed by the invention is adopted to carry out surface treatment on the aluminum alloy thin-wall die casting, so that the aluminum alloy thin-wall die casting has high stability and corrosion resistance, the yield is improved, the coating is firm, the thickness is uniform, the aluminum alloy thin-wall die casting is not easy to fall off, the aluminum alloy thin-wall die casting can be effectively protected, the service life of the aluminum alloy thin-wall die casting is prolonged, the process flow is simple to operate, the cost is lower, the process is suitable for wide popularization, and the problems that in the prior art, the surface treatment operation process of the aluminum alloy thin-wall die casting is complex, the phenomenon of uneven coating is easy to occur, the coating is easy to fall off after long-time use, and the corrosion resistance and the weather resistance of a product are poor are solved.

Description

Surface treatment process for aluminum alloy thin-wall die casting
Technical Field
The invention relates to the technical field of aluminum alloy die castings, in particular to a surface treatment process of an aluminum alloy thin-wall die casting.
Background
In the process of die-casting large-area thin-wall aluminum alloy pieces, due to the characteristics of large-area thin walls of castings, small changes of process parameters and unreasonable die structures, the die-casting defects of poor forming, warping deformation, cold shut, cracks and the like are easily generated on products, and the rate of finished products is reduced. Therefore, a surface treatment of the thin-walled aluminum alloy die casting is required.
The surface treatment is a process method 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.
However, the surface treatment process of the aluminum alloy thin-wall die casting in the prior art has complex operation procedures, is easy to generate the phenomenon of uneven plating, is easy to fall off after being used for a long time, has poor corrosion resistance and weather resistance, has low yield, and can not meet the requirements of the existing market. Therefore, the technical personnel in the field provide a surface treatment process of the aluminum alloy thin-wall die casting to solve the problems in the background technology.
Disclosure of Invention
The invention aims to provide a surface treatment process of an aluminum alloy thin-wall die casting to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a surface treatment process for an aluminum alloy thin-wall die casting comprises the following steps:
s101: pretreatment: polishing the aluminum alloy thin-wall die casting, washing the polished aluminum alloy thin-wall die casting with water, and removing surface debris;
s102: acid washing: putting the pretreated aluminum alloy thin-wall die casting into an acid pickling solution, and carrying out ultrasonic acid pickling treatment to remove surface oxides;
s103: washing with water: placing the aluminum alloy thin-wall die casting subjected to pickling into deionized water for cleaning, removing a surface pickling solution, and then drying;
s104: degreasing: soaking the dried aluminum alloy thin-wall die casting in a degreasing solution for 10-20 min, removing surface grease, and then washing and drying;
s105: phosphorization: placing the degreased aluminum alloy thin-wall die casting into a phosphating solution to be soaked for 20-30 min, performing phosphating treatment, and then performing water washing and drying treatment;
s106: nickel plating: putting the phosphatized aluminum alloy thin-wall die casting into electrolyte for electrolytic nickel plating treatment to obtain a nickel film layer, and then cleaning and drying the nickel film layer;
s107: galvanizing: putting the nickel-plated aluminum alloy thin-wall die casting into electrolyte for electrolytic galvanizing treatment to obtain a zinc film layer, and then cleaning and drying the zinc film layer;
s108: passivation: and (3) soaking the galvanized aluminum alloy thin-wall die casting into a passivation solution for 5-10 min, carrying out passivation treatment, and then cleaning and drying.
As a further scheme of the invention: the pickling solution in the step S102 comprises the following components in parts by weight: 10-20 parts of nitric acid, 7-12 parts of hydrofluoric acid and 5-8 parts of sulfuric acid.
As a still further scheme of the invention: when the degreasing treatment is carried out in the step S104, the degreasing temperature is 20-30 ℃; the degreasing solution is any one of trisodium phosphate or sodium carbonate.
As a still further scheme of the invention: the phosphating solution in the step S105 is a mixture of phosphoric acid, nitrate, hydrogen peroxide and zinc dihydrogen phosphate.
As a still further scheme of the invention: the mass addition ratio of phosphoric acid, nitrate, hydrogen peroxide and zinc dihydrogen phosphate in the phosphating solution is 3:2:1: 1.
As a still further scheme of the invention: the nickel plating solution in the step S106 comprises the following components in parts by weight: 25-35 parts of nickel sulfate, 16-20 parts of sodium hypophosphite, 5-9 parts of sodium hydroxide, 3-7 parts of sodium silicate and 2-6 parts of alumina particles.
As a still further scheme of the invention: the thickness of the nickel plating in the step S106 is 0.2-0.6 μm.
As a still further scheme of the invention: the galvanizing solution in the step S107 comprises the following components in parts by weight: 20-30 parts of zinc ammonium phosphate and 10-15 parts of zinc chloride.
As a still further scheme of the invention: the thickness of the zinc plating in the step S107 is 0.3-1 μm.
As a still further scheme of the invention: the passivation solution in the step S108 comprises the following components in parts by weight: 8-15 parts of chromic anhydride, 3-9 parts of aluminum sulfate, 2-5 parts of vanadate and 5-10 parts of sodium phosphate.
Compared with the prior art, the invention has the beneficial effects that: the invention discloses a surface treatment process of an aluminum alloy thin-wall die casting, which carries out surface treatment on the aluminum alloy thin-wall die casting through the working procedures of pretreatment, acid washing, water washing, degreasing, phosphating, nickel plating, zinc plating and passivation, so that the aluminum alloy thin-wall die casting has high stability and corrosion resistance, the yield is improved, a plating layer is firm, the thickness is uniform, the aluminum alloy thin-wall die casting is not easy to fall off, the aluminum alloy thin-wall die casting can be effectively protected, the oxidation resistance and the weather resistance of the aluminum alloy thin-wall die casting are improved, and the service life of the aluminum alloy thin-wall die casting is prolonged.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the present invention, the first and second substrates,
example 1
A surface treatment process for an aluminum alloy thin-wall die casting comprises the following steps:
s101: pretreatment: polishing the aluminum alloy thin-wall die casting, washing the polished aluminum alloy thin-wall die casting with water, and removing surface debris;
s102: acid washing: putting the pretreated aluminum alloy thin-wall die casting into an acid pickling solution, and carrying out ultrasonic acid pickling treatment to remove surface oxides;
s103: washing with water: placing the aluminum alloy thin-wall die casting subjected to pickling into deionized water for cleaning, removing a surface pickling solution, and then drying;
s104: degreasing: soaking the dried aluminum alloy thin-wall die casting in a degreasing solution for 10min to remove surface grease, and then washing and drying;
s105: phosphorization: placing the degreased aluminum alloy thin-wall die casting into a phosphating solution for soaking for 20min, performing phosphating treatment, and then performing water washing and drying treatment;
s106: nickel plating: putting the phosphatized aluminum alloy thin-wall die casting into electrolyte for electrolytic nickel plating treatment to obtain a nickel film layer, and then cleaning and drying the nickel film layer;
s107: galvanizing: putting the nickel-plated aluminum alloy thin-wall die casting into an electrolyte for electrolytic galvanizing treatment to obtain a zinc film layer, and then cleaning and drying the zinc film layer;
s108: passivation: and (3) soaking the galvanized aluminum alloy thin-wall die casting into a passivation solution for 5min, carrying out passivation treatment, and then cleaning and drying.
Further, the pickling solution in the step S102 comprises the following components in parts by weight: 10 parts of nitric acid, 7 parts of hydrofluoric acid and 5 parts of sulfuric acid.
Further, in the step S104, the degreasing temperature is 20 ℃; the degreasing solution is trisodium phosphate.
Still further, the phosphating solution in step S105 is a mixture of phosphoric acid, nitrate, hydrogen peroxide and zinc dihydrogen phosphate.
Further, the mass addition ratio of phosphoric acid, nitrate, hydrogen peroxide and zinc dihydrogen phosphate in the phosphating solution is 3:2:1: 1.
Further, the nickel plating solution in the step S106 comprises the following components in parts by weight: 25 parts of nickel sulfate, 16 parts of sodium hypophosphite, 5 parts of sodium hydroxide, 3 parts of sodium silicate and 2 parts of aluminum oxide particles.
Still further, the thickness of the nickel plating in step S106 is 0.2. mu.m.
Still further, the galvanizing solution in the step S107 comprises the following components in parts by weight: 20 parts of zinc ammonium phosphate and 10 parts of zinc chloride.
Still further, the thickness of the zinc plating in step S107 was 0.3. mu.m.
Still further, the passivation solution in step S108 comprises the following components in parts by weight: 8 parts of chromic anhydride, 3 parts of aluminum sulfate, 2 parts of vanadate and 5 parts of sodium phosphate.
Example 2
A surface treatment process for an aluminum alloy thin-wall die casting comprises the following steps:
s101: pretreatment: polishing the aluminum alloy thin-wall die casting, washing the polished aluminum alloy thin-wall die casting with water, and removing surface debris;
s102: acid washing: putting the pretreated aluminum alloy thin-wall die casting into an acid pickling solution, and carrying out ultrasonic acid pickling treatment to remove surface oxides;
s103: washing with water: placing the aluminum alloy thin-wall die casting subjected to pickling into deionized water for cleaning, removing a surface pickling solution, and then drying;
s104: degreasing: soaking the dried aluminum alloy thin-wall die casting in a degreasing solution for 20min to remove surface grease, and then washing and drying;
s105: phosphorization: placing the degreased aluminum alloy thin-wall die casting into a phosphating solution to be soaked for 30min for phosphating, and then washing and drying;
s106: nickel plating: putting the phosphatized aluminum alloy thin-wall die casting into electrolyte for electrolytic nickel plating treatment to obtain a nickel film layer, and then cleaning and drying the nickel film layer;
s107: galvanizing: putting the nickel-plated aluminum alloy thin-wall die casting into an electrolyte for electrolytic galvanizing treatment to obtain a zinc film layer, and then cleaning and drying the zinc film layer;
s108: passivation: and (3) soaking the galvanized aluminum alloy thin-wall die casting into a passivation solution for 10min, carrying out passivation treatment, and then cleaning and drying.
Further, the pickling solution in the step S102 comprises the following components in parts by weight: 20 parts of nitric acid, 12 parts of hydrofluoric acid and 8 parts of sulfuric acid.
Further, in the step S104, the degreasing temperature is 30 ℃; the degreasing solution is sodium carbonate.
Still further, the phosphating solution in step S105 is a mixture of phosphoric acid, nitrate, hydrogen peroxide and zinc dihydrogen phosphate.
Further, the mass addition ratio of phosphoric acid, nitrate, hydrogen peroxide and zinc dihydrogen phosphate in the phosphating solution is 3:2:1: 1.
Further, the nickel plating solution in the step S106 comprises the following components in parts by weight: 35 parts of nickel sulfate, 20 parts of sodium hypophosphite, 9 parts of sodium hydroxide, 7 parts of sodium silicate and 6 parts of alumina particles.
Still further, the thickness of the nickel plating in step S106 was 0.6. mu.m.
Still further, the galvanizing solution in the step S107 comprises the following components in parts by weight: 30 parts of zinc ammonium phosphate and 15 parts of zinc chloride.
Still further, the thickness of the zinc plating in step S107 is 1 μm.
Still further, the passivation solution in step S108 comprises the following components in parts by weight: 15 parts of chromic anhydride, 9 parts of aluminum sulfate, 5 parts of vanadate and 10 parts of sodium phosphate.
Example 3
A surface treatment process for an aluminum alloy thin-wall die casting comprises the following steps:
s101: pretreatment: polishing the aluminum alloy thin-wall die casting, washing the polished aluminum alloy thin-wall die casting with water, and removing surface debris;
s102: acid washing: putting the pretreated aluminum alloy thin-wall die casting into an acid pickling solution, and carrying out ultrasonic acid pickling treatment to remove surface oxides;
s103: washing with water: placing the aluminum alloy thin-wall die casting subjected to pickling into deionized water for cleaning, removing a surface pickling solution, and then drying;
s104: degreasing: soaking the dried aluminum alloy thin-wall die casting in a degreasing solution for 15min to remove surface grease, and then washing and drying;
s105: phosphorization: placing the degreased aluminum alloy thin-wall die casting into a phosphating solution for soaking for 25min, carrying out phosphating treatment, and then carrying out water washing and drying treatment;
s106: nickel plating: putting the phosphatized aluminum alloy thin-wall die casting into electrolyte for electrolytic nickel plating treatment to obtain a nickel film layer, and then cleaning and drying the nickel film layer;
s107: galvanizing: putting the nickel-plated aluminum alloy thin-wall die casting into an electrolyte for electrolytic galvanizing treatment to obtain a zinc film layer, and then cleaning and drying the zinc film layer;
s108: passivation: and (3) soaking the galvanized aluminum alloy thin-wall die casting into a passivation solution for 7min, carrying out passivation treatment, and then cleaning and drying.
Further, the pickling solution in the step S102 comprises the following components in parts by weight: 15 parts of nitric acid, 9 parts of hydrofluoric acid and 7 parts of sulfuric acid.
Further, in the step S104, the degreasing temperature is 25 ℃; the degreasing solution is trisodium phosphate.
Still further, the phosphating solution in step S105 is a mixture of phosphoric acid, nitrate, hydrogen peroxide and zinc dihydrogen phosphate.
Further, the mass addition ratio of phosphoric acid, nitrate, hydrogen peroxide and zinc dihydrogen phosphate in the phosphating solution is 3:2:1: 1.
Further, the nickel plating solution in the step S106 comprises the following components in parts by weight: 30 parts of nickel sulfate, 18 parts of sodium hypophosphite, 7 parts of sodium hydroxide, 5 parts of sodium silicate and 4 parts of alumina particles.
Still further, the thickness of the nickel plating in step S106 is 0.4. mu.m.
Still further, the galvanizing solution in the step S107 comprises the following components in parts by weight: 25 parts of zinc ammonium phosphate and 12 parts of zinc chloride.
Still further, the thickness of the zinc plating in step S107 was 0.7. mu.m.
Still further, the passivation solution in step S108 comprises the following components in parts by weight: 13 parts of chromic anhydride, 6 parts of aluminum sulfate, 4 parts of vanadate and 8 parts of sodium phosphate.
In conclusion, the process carries out surface treatment on the aluminum alloy thin-wall die casting through the steps of pretreatment, acid washing, water washing, degreasing, phosphating, nickel plating, zinc plating and passivation, so that the aluminum alloy thin-wall die casting has high stability and corrosion resistance, the yield is improved, the plating layer is firm, is uniform in thickness and is not easy to fall off, the aluminum alloy thin-wall die casting can be effectively protected, the oxidation resistance and weather resistance of the aluminum alloy thin-wall die casting are improved, the service life of the aluminum alloy thin-wall die casting is prolonged, the process flow is simple to operate, the cost is low, the process is suitable for wide popularization, and the problems that in the prior art, the surface treatment operation of the aluminum alloy thin-wall die casting is complex, the plating layer is not uniform, the coating is easy to fall off after long-time use, the corrosion resistance and weather resistance of a product are poor, and the yield is low are solved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A surface treatment process of an aluminum alloy thin-wall die casting is characterized by comprising the following steps: the surface treatment process specifically comprises the following steps:
s101: pretreatment: polishing the aluminum alloy thin-wall die casting, washing the polished aluminum alloy thin-wall die casting with water, and removing surface debris;
s102: acid washing: putting the pretreated aluminum alloy thin-wall die casting into an acid pickling solution, and carrying out ultrasonic acid pickling treatment to remove surface oxides;
s103: washing with water: placing the aluminum alloy thin-wall die casting subjected to pickling into deionized water for cleaning, removing a surface pickling solution, and then drying;
s104: degreasing: soaking the dried aluminum alloy thin-wall die casting in a degreasing solution for 10-20 min, removing surface grease, and then washing and drying;
s105: phosphorization: placing the degreased aluminum alloy thin-wall die casting into a phosphating solution to be soaked for 20-30 min, performing phosphating treatment, and then performing water washing and drying treatment;
s106: nickel plating: putting the phosphatized aluminum alloy thin-wall die casting into electrolyte for electrolytic nickel plating treatment to obtain a nickel film layer, and then cleaning and drying the nickel film layer;
s107: galvanizing: putting the nickel-plated aluminum alloy thin-wall die casting into an electrolyte for electrolytic galvanizing treatment to obtain a zinc film layer, and then cleaning and drying the zinc film layer;
s108: passivation: and (3) soaking the galvanized aluminum alloy thin-wall die casting into a passivation solution for 5-10 min, carrying out passivation treatment, and then cleaning and drying.
2. The surface treatment process of the aluminum alloy thin-wall die casting as claimed in claim 1, wherein: the pickling solution in the step S102 comprises the following components in parts by weight: 10-20 parts of nitric acid, 7-12 parts of hydrofluoric acid and 5-8 parts of sulfuric acid.
3. The surface treatment process of the aluminum alloy thin-wall die casting as claimed in claim 1, wherein: when the degreasing treatment is carried out in the step S104, the degreasing temperature is 20-30 ℃;
the degreasing solution is any one of trisodium phosphate or sodium carbonate.
4. The surface treatment process of the aluminum alloy thin-wall die casting as claimed in claim 1, wherein the surface treatment process comprises the following steps: the phosphating solution in the step S105 is a mixture of phosphoric acid, nitrate, hydrogen peroxide and zinc dihydrogen phosphate.
5. The surface treatment process of the aluminum alloy thin-wall die casting as claimed in claim 4, wherein: the mass addition ratio of phosphoric acid, nitrate, hydrogen peroxide and zinc dihydrogen phosphate in the phosphating solution is 3:2:1: 1.
6. The surface treatment process of the aluminum alloy thin-wall die casting as claimed in claim 1, wherein the surface treatment process comprises the following steps: the nickel plating solution in the step S106 comprises the following components in parts by weight: 25-35 parts of nickel sulfate, 16-20 parts of sodium hypophosphite, 5-9 parts of sodium hydroxide, 3-7 parts of sodium silicate and 2-6 parts of aluminum oxide particles.
7. The surface treatment process of the aluminum alloy thin-wall die casting as claimed in claim 1, wherein the surface treatment process comprises the following steps: the thickness of the nickel plating in the step S106 is 0.2-0.6 μm.
8. The surface treatment process of the aluminum alloy thin-wall die casting as claimed in claim 1, wherein: the galvanizing solution in the step S107 comprises the following components in parts by weight: 20-30 parts of zinc ammonium phosphate and 10-15 parts of zinc chloride.
9. The surface treatment process of the aluminum alloy thin-wall die casting as claimed in claim 1, wherein: the thickness of the zinc plating in the step S107 is 0.3-1 μm.
10. The surface treatment process of the aluminum alloy thin-wall die casting as claimed in claim 1, wherein: the passivation solution in the step S108 comprises the following components in parts by weight: 8-15 parts of chromic anhydride, 3-9 parts of aluminum sulfate, 2-5 parts of vanadate and 5-10 parts of sodium phosphate.
CN202210352496.3A 2022-04-05 2022-04-05 Surface treatment process for aluminum alloy thin-wall die casting Pending CN114657614A (en)

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