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Micro-arc oxidation method for surfaces of copper, copper alloy, zinc and zinc alloy

A technology of micro-arc oxidation and copper alloy, which is applied in the field of electrochemistry, can solve the problems of poor wear resistance of the film layer and poor adhesion of the substrate, and achieve the effects of enhanced corrosion resistance, enhanced wear resistance, and firm adhesion

Inactive Publication Date: 2016-02-17
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] As we all know, only valve metals (aluminum, magnesium, zirconium, titanium, etc.) can be directly subjected to micro-arc oxidation on the surface, while non-valve metals such as copper, iron, and zinc cannot be directly subjected to micro-arc oxidation on the surface, and secondary treatment is required. However, most of the micro-arc oxidation film after the secondary treatment will appear in the substrate due to poor adhesion and poor wear resistance of the film.

Method used

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  • Micro-arc oxidation method for surfaces of copper, copper alloy, zinc and zinc alloy
  • Micro-arc oxidation method for surfaces of copper, copper alloy, zinc and zinc alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: After the brass is polished, a pure aluminum film of about 40 microns is formed by magnetron sputtering. After being sealed with epoxy resin, the brass is placed in a concentration of 32g / L sodium aluminate plus 1g potassium hydroxide , set the electrolysis parameters to positive current 0.6A / cm 2 Negative current is 0.5A / cm 2 , the positive and negative duty cycle is 20%, and the frequency is 1000Hz. After sputtering a pure aluminum film, the brass is used as the anode, and the steel plate is used as the cathode. After 5 minutes of reaction, a dense wear-resistant aluminum oxide ceramic film can be formed on the surface of the brass to obtain a brass sample.

[0028] The brass sample that embodiment 1 obtains is carried out wear resistance and corrosion resistance test, and its main testing instrument is as follows:

[0029] TT260 Layer Thickness Gauge: Beijing Times Peak Technology Co., Ltd. Can be used to measure the thickness of the film layer;

[...

Embodiment 2

[0038] Embodiment 2: Carry out the micro-arc oxidation treatment of the present invention to copper according to the conditions of embodiment 1, wherein the thickness of the aluminum film prepared by magnetron sputtering is 60 microns. Compared with the corresponding untreated copper, the wear resistance is increased by about 17 times, and the corrosion resistance current is reduced by about 3 orders of magnitude.

Embodiment 3

[0039] Embodiment 3: Zinc is subjected to the micro-arc oxidation treatment of the present invention according to the conditions of Embodiment 1, wherein the thickness of the aluminum film prepared by magnetron sputtering is 45 microns. Compared with the corresponding untreated zinc, the wear resistance is increased by about 12 times, and the corrosion resistance current is reduced by about 2 orders of magnitude.

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Abstract

The invention discloses a micro-arc oxidation method for surfaces of copper, copper alloy, zinc and zinc alloy. The method includes the steps that aluminum films are manufactured on the surfaces of the copper or the copper alloy or the zinc or the zinc alloy through a magnetron sputtering method, the aluminum films are then treated through a micro-arc oxidation method, and therefore aluminum oxide ceramic films are obtained. Due to the fact that non-valve metal subjected to magnetron sputtering treatment is then subjected to micro-arc oxidation, the aluminum oxide ceramic films are obtained, abrasion resistance is improved by more than 10 times, and corrosion resistance is enhanced greatly; and the technical problem that the ceramic films cannot be manufactured for the non-valve metal through the micro-arc oxidation method or the performance of the manufactured ceramic films is quite poor is solved.

Description

technical field [0001] The invention relates to a micro-arc oxidation method on the surface of copper, copper alloy, zinc and zinc alloy, belonging to the field of electrochemistry. Background technique [0002] As we all know, only valve metals (aluminum, magnesium, zirconium, titanium, etc.) can be directly subjected to micro-arc oxidation on the surface, while non-valve metals such as copper, iron, and zinc cannot be directly subjected to micro-arc oxidation on the surface, and secondary treatment is required. However, most of the micro-arc oxidation coatings after the secondary treatment will appear in the characteristics of poor adhesion to the substrate and poor wear resistance of the coating. [0003] Because copper-based composite materials have high electrical and thermal conductivity, they are expected to be used in fields that require both high conductivity and wear resistance. In practical applications, copper-based composite materials are often used as conductiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/58C25D11/04C25D11/06
CPCC23C14/35C23C14/5846C25D11/024C25D11/04C25D11/06
Inventor 曹金晖程英亮谢焕钧
Owner HUNAN UNIV
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