Method for improving compactness of aluminum alloy micro-arc oxide coating

A technology of micro-arc oxidation and aluminum alloy, which is applied in anodic oxidation and other directions, can solve the problems of low density and high energy consumption of aluminum alloy micro-arc oxidation coating, and achieve the effect of wide application range, good repeatability and simple operation

Inactive Publication Date: 2017-05-10
GUANGXI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for improving the compactness of the aluminum alloy micro-arc oxidation coating, which mainly solves the problems of low compactness and high energy consumption of the aluminum alloy micro-arc oxidation coating

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  • Method for improving compactness of aluminum alloy micro-arc oxide coating

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Embodiment 1

[0023] A method for improving the compactness of an aluminum alloy micro-arc oxidation coating, comprising the following steps:

[0024] 1. Sample pretreatment: the aluminum alloy sample is polished to smooth step by step with sandpaper, then ultrasonically cleaned in acetone for 15 minutes, and air-dried at room temperature;

[0025] 2. Coating preparation: the aluminum alloy sample is used as the anode, the stainless steel tank is used as the cathode, the anode is immersed in the electrolyte, the AC constant voltage mode is used for micro-arc oxidation treatment, the electrical parameters are set, the treatment temperature is 35~45°C, the treatment Time 30min; wash off the remaining electrolyte on the surface of the sample with cold water, and air-dry at room temperature; the electrolyte is 12g / L sodium silicate, 1.5g / L potassium hydroxide, 2g / L sodium fluoride, 6ml / L triethanolamine, 2ml / L hydrogen peroxide; the electrical parameters are positive voltage 440V, negative vol...

Embodiment 2

[0028] A method for improving the compactness of an aluminum alloy micro-arc oxidation coating, comprising the following steps:

[0029] 1. Sample pretreatment: the aluminum alloy sample was polished step by step with sandpaper until smooth, then ultrasonically cleaned in acetone for 5 minutes, and air-dried at room temperature;

[0030] 2. Coating preparation: the aluminum alloy sample is used as the anode, the stainless steel tank is used as the cathode, the anode is immersed in the electrolyte, and the AC constant voltage mode is used for micro-arc oxidation treatment, the treatment temperature is 25~40°C, and the treatment time is 30min; Wash off the remaining electrolyte on the surface of the sample with cold water, and air-dry at room temperature; the electrolyte is 20 g / L sodium metaaluminate, 0.5 g / L sodium hydroxide, 0.5 g / L ethylenediaminetetraacetic acid, 1 g / L sodium pyrophosphate ;The electrical parameters are positive voltage 420V, negative voltage 125V, positive...

Embodiment 3

[0034] A method for improving the compactness of an aluminum alloy micro-arc oxidation coating, comprising the following steps:

[0035] 1. Sample pretreatment: the aluminum alloy sample was polished to smooth step by step with sandpaper, then ultrasonically cleaned in acetone for 10 minutes, and air-dried at room temperature;

[0036]2. Coating preparation: the aluminum alloy sample is used as the anode, the stainless steel tank is used as the cathode, the anode is immersed in the electrolyte, and the AC constant voltage mode is used for micro-arc oxidation treatment. 30min; wash off the residual electrolyte on the surface of the sample with cold water, and air-dry at room temperature; the electrolyte is 5g / L sodium phosphate, 4 g / L potassium hydroxide, 10ml / L triethanolamine; the electrical parameters are positive voltage 480V, negative voltage It is 0V, the positive duty cycle is 8%, the negative duty cycle is 0%, and the frequency is 700Hz;

[0037] 3. Laser treatment of ...

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Abstract

The invention discloses a method for improving compactness of aluminum alloy micro-arc oxide coating, and belongs to the technical field of aluminum alloy surface modification. The method comprises the following steps of: grinding an aluminum alloy sample to be smooth, ultrasonically cleaning the aluminum alloy sample, putting the ultrasonically-cleaned aluminum alloy sample into electrolyte to perform micro-arc oxidization treatment, thereby preparing an aluminum-alloy micro-arc oxidation coating; and finally, performing laser scanning processing on the aluminum-alloy micro-arc oxidation coating by high-energy laser beams generated by laser unit equipment. The method disclosed by the invention can improve the structure of the aluminum-alloy micro-arc oxidation coating, so that a metastable phase in the coating is converted into a stable phase. The method effectively improves the problems that compaction of the coating is relatively poor as a result of porous characteristics, and the energy consumption for obtaining the micro-arc oxidation coating with good compactness is high, so that corrosion and wear resistance of the micro-arc oxidization coating is greatly improved; and moreover, the method is simple in process, is good in repeatability, and can be used for industrial large-area preparation.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface modification, and in particular relates to a method for improving the compactness of an aluminum alloy micro-arc oxidation coating. Background technique [0002] Micro-arc Oxidation (MAO for short) technology is through the combination of electrolyte and corresponding electrical parameters, so that the material can be oxidized in aluminum, magnesium, titanium, zirconium under the joint action of chemical oxidation, electrochemical oxidation and plasma oxidation. Surface treatment technology for in-situ growth of ceramic coatings on metal surfaces. Compared with anodic oxidation, this technology has a simple process, no pollution to the electrolyte, and greatly improves the corrosion and wear resistance of the prepared ceramic coating. It has been widely used in aerospace, mechanical electronics, automobiles, ships, and petrochemical industries. . However, the micro-arc discharge d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06C25D11/18
CPCC25D11/06C25D11/18
Inventor 李伟洲唐仕光陈泉志黄祖江童庆董婉冰蒋智秋黄德宇蒋馥蔓
Owner GUANGXI UNIV
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