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Preparation method of wear-resistant, corrosion-resistant and thermal-shock resistant coating on aluminum alloy surface

A technology of aluminum alloy surface and aluminum alloy, which is applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc., can solve the problem that the film formation and growth mechanism are not uniform, and achieve excellent thermal shock resistance, high hardness, and combination Lego effect

Active Publication Date: 2019-02-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the research on micro-arc oxidation technology is very extensive, for example, the Chinese patent with the application number of 201210165095.3 "Preparation method of ceramic coating on the surface of aluminum alloy" The method of color film layer", however, there is no unified view on the formation and growth mechanism of the film

Method used

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  • Preparation method of wear-resistant, corrosion-resistant and thermal-shock resistant coating on aluminum alloy surface
  • Preparation method of wear-resistant, corrosion-resistant and thermal-shock resistant coating on aluminum alloy surface
  • Preparation method of wear-resistant, corrosion-resistant and thermal-shock resistant coating on aluminum alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] 1. Preparation and pretreatment of matrix material

[0071] In this experiment, 2A12 aluminum alloy is selected as the micro-arc oxidation matrix, and the main components of the matrix are:

[0072] Table 1 Chemical composition of 2A12 aluminum alloy (mass fraction, %)

[0073]

[0074] The sample was cut into small pieces of 12×12×7mm, polished on 400#, 600# and 1000# sandpaper before the experiment, and then rinsed with alcohol and deionized water.

[0075] 2. Preparation of electrolyte

[0076] Add lanthanum nitrate as an additive to water, and simultaneously add ethylenediaminetetraacetate, acetate, and tungstate to prepare an electrolyte; wherein the concentration of the lanthanum nitrate is 0.3g / L, and ethylenediaminetetraacetic acid The concentration of salt is 0.5g / L, the concentration of acetate is 10g / L, and the concentration of tungstate is 3g / L.

[0077] 3. Electrical parameters

[0078] The processed aluminum alloy is placed in the prepared electrolyte as the positive...

Embodiment 2

[0080] 1. Preparation and pretreatment of matrix material

[0081] The same operation as in Example 1.

[0082] 2. Preparation of electrolyte

[0083] Add lanthanum nitrate as an additive to water, and simultaneously add ethylenediaminetetraacetate, acetate, and tungstate to prepare an electrolyte; wherein the concentration of the lanthanum nitrate is 0.5g / L, and ethylenediaminetetraacetic acid The concentration of salt is 0.5g / L, the concentration of acetate is 10g / L, and the concentration of tungstate is 3g / L.

[0084] 3. Electrical parameters

[0085] The same operation as in Example 1.

Embodiment 3

[0087] 1. Preparation and pretreatment of matrix material

[0088] The same operation as in Example 1.

[0089] 2. Preparation of electrolyte

[0090] Add lanthanum nitrate as an additive to water, and simultaneously add ethylenediaminetetraacetate, acetate and tungstate to prepare an electrolyte; wherein the concentration of the lanthanum nitrate is 0.7g / L, and ethylenediaminetetraacetic acid The concentration of salt is 0.5g / L, the concentration of acetate is 10g / L, and the concentration of tungstate is 3g / L.

[0091] 3. Electrical parameters

[0092] The same operation as in Example 1.

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Abstract

The invention discloses a preparation method of a wear-resisting anti-corrosion thermal-shock-resisting coating on the surface of an aluminum alloy. The method comprises the following steps that (1), an electrolytic solution is prepared, specifically, lanthanum nitrate serves as an additive to be added into water, and meanwhile ethylenediamine tetracetic acid sodium, acetate and tungstate are added to prepare the electrolytic solution; and (2), the aluminum alloy is put into the electrolytic solution in the step (1), the aluminum alloy serves as the anode in electrolytic solution, stainless steel serves as the cathode, and after micro-arc oxidization treatment is adopted, the aluminum alloy with the wear-resisting anti-corrosion thermal-shock-resisting coating is obtained. According to the preparation method of the wear-resisting anti-corrosion thermal-shock-resisting coating on the surface of the aluminum alloy, by selecting the appropriate electrolytic solution and adjusting a relevant technological parameter, the morphology and the microscopic structure of a thin film are controlled, and the micro-arc oxidization coating with good wear-resisting, anti-corrosion and thermal-shock-resisting performance and high binding force and hardness is obtained.

Description

Technical field [0001] The invention belongs to the field of aluminum alloy surface treatment, and specifically relates to a method for preparing a wear-resistant, corrosion-resistant and thermal shock-resistant coating on the surface of an aluminum alloy. Background technique [0002] In recent years, with the rapid economic development, the demand for materials and energy has increased sharply, which has caused tremendous pressure on the environment. In order to maintain the sustainable development of the environment, people began to try to reduce the waste of resources and increase the utilization rate. At present, some enterprises and industrial production have adopted some measures to reduce environmental pollution. For example, in the transportation industry, automobiles emit 19% of global greenhouse gases every year. People are beginning to focus on improving fuel utilization and reducing greenhouse gas. Gas emission and other aspects. [0003] There are many factors that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/06
CPCC01P2002/72C01P2004/03C25D11/024C25D11/026C25D11/06
Inventor 陈传忠林兆擎于慧君
Owner SHANDONG UNIV