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CN-115573013-B - Surface treatment process of aluminum alloy

CN115573013BCN 115573013 BCN115573013 BCN 115573013BCN-115573013-B

Abstract

The invention relates to a surface treatment process of aluminum alloy, which comprises the steps of S1 degreasing, S2 alkali etching, S3 neutralization, S4 chemical polishing, S5 anodic oxidation, namely placing an aluminum alloy substrate subjected to the chemical polishing treatment in an anodic oxidation liquid for anodic oxidation treatment, wherein the anodic oxidation liquid is sulfuric acid solution with the mass concentration of 180-190g/L, S6 electrolysis, namely placing the aluminum alloy substrate subjected to the anodic oxidation in potassium sodium tartrate solution with the mass concentration of 10-13 g/L for electrolysis, and S7 hole sealing, namely placing the aluminum alloy substrate subjected to the anodic oxidation in hole sealing agent with the mass concentration of 12-15g/L for hole sealing. According to the surface treatment process of the aluminum alloy, the aluminum alloy substrate subjected to anodic oxidation treatment by sulfuric acid is placed in the potassium sodium tartrate solution for electrolysis, so that the covering of an oxide film on the natural color of the aluminum alloy is reduced, the appearance color effect of the aluminum alloy product is similar to or consistent with the natural color of the aluminum alloy, and the surface treatment process of the aluminum alloy is easy to control, simple and convenient and easy to obtain.

Inventors

  • MAO HAIHONG
  • MA GANG
  • LI CONGKE

Assignees

  • 广东长盈精密技术有限公司

Dates

Publication Date
20260505
Application Date
20221018

Claims (8)

  1. 1. The surface treatment process of the aluminum alloy is characterized by comprising the following steps of: S1 degreasing, namely immersing an aluminum alloy substrate in a degreasing agent for degreasing; s2, alkali etching, namely placing the aluminum alloy substrate degreased in the step S1 into alkali liquor for alkali etching; s3, neutralization, namely immersing the aluminum alloy substrate subjected to alkali etching in the step S2 into an ash remover for neutralization; S4, chemical polishing, namely placing the aluminum alloy substrate subjected to the neutralization treatment in the step S3 into a chemical polishing agent for chemical polishing; S5, anodic oxidation, namely placing the aluminum alloy substrate subjected to the chemical polishing treatment in the step S4 into an anodic oxidation solution for anodic oxidation treatment, wherein the anodic oxidation solution is sulfuric acid solution with the mass concentration of 180-190 g/L; s6, electrolysis, namely placing the aluminum alloy substrate subjected to the anodic oxidation in the step S5 into a sodium potassium tartrate solution with the mass concentration of 10-13 g/L for electrolysis; s7, hole sealing, namely placing the electrolyzed aluminum alloy base material into a hole sealing agent with the mass concentration of 12-15g/L for hole sealing; Wherein the anodic oxidation temperature is 15-20 ℃, the anodic oxidation voltage is 10-15V, and the anodic oxidation time is 50-60min; The electrolysis temperature is 15-20 ℃, the electrolysis voltage is 10-15V, and the electrolysis time is 5-8min.
  2. 2. The surface treatment process of aluminum alloy according to claim 1, wherein in the step S1, the degreasing temperature is 55-65 ℃, the degreasing time is 4-6min, and the mass concentration of the degreasing agent is 50-60g/L.
  3. 3. The surface treatment process of an aluminum alloy according to claim 1, wherein in step S1, the aluminum alloy substrate is made of a 6-series aluminum alloy.
  4. 4. The surface treatment process of aluminum alloy according to claim 1, wherein the aluminum alloy substrate is made of 6023 alloy.
  5. 5. The surface treatment process of aluminum alloy according to claim 1, wherein in step S2, the alkali etching temperature is 50-60 ℃ and the alkali etching time is 8-15S, and the alkali solution comprises sodium hydroxide solution with a mass concentration of 50-60 g/L.
  6. 6. The surface treatment process of aluminum alloy according to claim 1, wherein in step S3, the ash removing agent comprises nitrogen-free ash removing agent with mass concentration of 180-200g/L, and the neutralization time is 3-5.5min.
  7. 7. The surface treatment process of the aluminum alloy according to claim 1, wherein in the step S4, the chemical polishing agent comprises one or a mixed solution of sulfuric acid solution and phosphoric acid solution, the mass concentration of the chemical polishing agent is 170-200g/L, the chemical polishing temperature is 75-80 ℃, the chemical polishing time is 45-55S, and the 60-DEG glossiness of the aluminum alloy substrate after chemical polishing is 70+/-5%.
  8. 8. The surface treatment process of aluminum alloy according to claim 1, wherein the sealing temperature is 85-95 ℃ and the sealing time is 60-90min.

Description

Surface treatment process of aluminum alloy Technical Field The invention relates to the technical field of processing technology of aluminum alloy products, in particular to a surface treatment technology of aluminum alloy. Background Along with the diversification of metal surface treatment colors and the requirement of personalized development, the aluminum alloy section bar which is close to or has the same color as the aluminum alloy is obtained by taking the color of the aluminum alloy as a color development base, and is popular among consumers because the aluminum alloy section bar has unique metallic bright color appearance. When the surface treatment is carried out on the aluminum alloy, the oxidation film formed on the surface of the aluminum alloy base material through anodic oxidation can cover the colors of the aluminum alloy base material to different degrees, so that the finally obtained aluminum alloy product cannot achieve the expected technical effect. Disclosure of Invention The invention aims to solve the problems and provides a surface treatment process of aluminum alloy. In order to solve the technical problems, the technical scheme adopted by the invention is as follows: A surface treatment process of an aluminum alloy, comprising the steps of: S1 degreasing, namely immersing an aluminum alloy substrate in a degreasing agent for degreasing; s2, alkali etching, namely placing the aluminum alloy substrate degreased in the step S1 into alkali liquor for alkali etching; s3, neutralization, namely immersing the aluminum alloy substrate subjected to alkali etching in the step S2 into an ash remover for neutralization; S4, chemical polishing, namely placing the aluminum alloy substrate subjected to the neutralization treatment in the step S3 into a chemical polishing agent for chemical polishing; S5, anodic oxidation, namely placing the aluminum alloy substrate subjected to the chemical polishing treatment in the step S4 into an anodic oxidation solution for anodic oxidation treatment, wherein the anodic oxidation solution is sulfuric acid solution with the mass concentration of 180-190 g/L; S6, electrolyzing, namely placing the aluminum alloy substrate subjected to anodic oxidation in a solution of potassium sodium tartrate (NaKC H4O 6) with the mass concentration of 10-13 g/L, wherein the potassium sodium tartrate is colorless semitransparent crystal powder, has the pH of 6.8-8 and is slightly alkaline and easy to dissolve in water, and when the aluminum alloy substrate is electrolyzed, the total reaction is 2H 20-→2H2+O2, the reaction of an anode is 4OH --4e-→O2+2H2 O, and the reaction of a cathode is 4H 2O→2H2+4OH-, and when the aluminum alloy substrate subjected to anodic oxidation is placed in the potassium sodium tartrate solution, al 2O3+2OH-+3H20→2[Al（OH）4]- is passed through the current; s7, hole sealing, namely placing the electrolyzed aluminum alloy base material into a hole sealing agent with the mass concentration of 12-15g/L for hole sealing. Preferably, in the step S1, the degreasing temperature is 55-65 ℃, the degreasing time is 4-6min, and the mass concentration of the degreasing agent is 50-60g/L. Preferably, in step S1, the aluminum alloy substrate is made of a 6-series aluminum alloy. Further preferably, the aluminum alloy base material is an alloy of model 6023. In practical operation, the inventor finds that an oxide film formed by anodic oxidation of an aluminum alloy substrate obtained by taking aluminum-manganese alloy as a raw material is brown yellow or even brown, an oxide film formed by anodic oxidation of an aluminum alloy substrate obtained by taking aluminum-zinc alloy as a raw material is opaque gray-black and opacifying, and an oxide film formed by anodic oxidation of an aluminum alloy substrate obtained by taking aluminum-silicon alloy or aluminum-copper alloy as a raw material is gray, and when the mass fraction of silicon is more than 2%, the oxide film is gray to black. Preferably, in step S2, the alkaline etching temperature is 50-60 ℃, the alkaline etching time is 8-15S, and the alkaline solution comprises a sodium hydroxide (NaOH) solution with the mass concentration of 50-60 g/L. Preferably, in the step S3, the ash removing agent comprises nitrogen-free ash removing agent with the mass concentration of 180-200g/L, and the neutralization time is 3-5.5min. Preferably, in the step S4, the chemical polishing agent comprises one or a mixed solution of sulfuric acid solution and phosphoric acid solution, the mass concentration of the chemical polishing agent is 170-200g/L, the chemical polishing temperature is 75-80 ℃, the chemical polishing time is 45-55S, and the 60-DEG glossiness of the aluminum alloy substrate subjected to chemical polishing treatment is 70+/-5%. The polishing time is too short to reach the preset polishing effect, the important dimension of the aluminum alloy can be influenced by the too long polishing time, the higher the sulfuric a