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Preparation method of high-compactness corrosion-resistant and abrasion-resistant magnesium alloy micro arc oxidization film

A technology of micro-arc oxidation and magnesium alloy, which is applied in the field of surface treatment, can solve the problems of insufficient density of the film layer, many pores, limitations of wear resistance and corrosion resistance, etc. Uniform, wear-resistant effect

Inactive Publication Date: 2018-06-05
GUIZHOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the conventional micro-arc oxidation film has more micropores and is larger, the film layer is not dense enough, and its wear resistance and corrosion resistance still have certain limitations.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0027] Embodiment: The present invention provides a kind of preparation process step of micro-arc oxidation film of high-density corrosion-resistant and wear-resistant magnesium alloy:

[0028] (1) Grinding the surface of magnesium and magnesium alloy parts to remove large-scale defects on the surface;

[0029] (2) carry out pre-treatment to remove oil stain through step-treated magnesium alloy;

[0030] (3) Prepare the micro-arc oxidation electrolyte, and add auxiliary additives, and stir the electrolyte;

[0031] (4) Put the magnesium alloy test piece, adjust the stirring speed of the electrolyte, and ensure that the test piece is stable and does not shake while stirring;

[0032] (5) Change the test piece, adjust the current density, duty cycle, frequency and other power parameters, and prepare samples;

[0033] (6) After sample preparation, turn off the power, take out the sample, rinse with water, and dry.

[0034] The aforementioned method for preparing a high-density...

specific Embodiment approach

[0047] (1) Grinding the surface of magnesium and magnesium alloy parts to remove large-scale defects on the surface;

[0048] (2) carry out pre-treatment to remove oil stain through step-treated magnesium alloy;

[0049] (3) Prepare the micro-arc oxidation electrolyte, and add auxiliary additives, and stir the electrolyte;

[0050] (4) Put the magnesium alloy test piece, adjust the stirring speed of the electrolyte, and ensure that the test piece is stable and does not shake while stirring;

[0051] (5) Change the test piece, adjust the current density, duty cycle, frequency and other power parameters, and prepare samples;

[0052] (6) After sample preparation, turn off the power, take out the sample, rinse with water, and dry.

[0053] Example

[0054] The magnesium alloy pretreatment method of the present invention is (1) magnesium and magnesium alloy parts are cleaned 5min in the solution in the sodium hydroxide of 60 ℃ of 20g / l and 20g / l sodium carbonate mixed solution;...

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Abstract

The invention provides a preparation method of a high-compactness corrosion-resistant and abrasion-resistant magnesium alloy micro arc oxidization film. An electrolyte of the preparation method is mainly composed of meta-aluminate and phosphate, and some adding agents capable of forming ceramic or insoluble salt are added in, so that different ceramic and insoluble salt can be formed. Due to the fact that the melting points of the ceramic or salt are different, the cooling times of the ceramic or salt are different in the micro arc oxidization process, in this way, holes left by melt cooled firstly can be filled with melt cooled later, and therefore the high-compactness micro arc oxidization film is formed. Little refractory solid oxide powder exists and can serve as a nucleating core during solidification, the nucleating rate can be increased, and therefore the micro arc oxidization film can be more uniform. The micro alloy micro arc oxidization film prepared through the preparation method has good compactness, abrasion resistance and corrosion resistance. The high-compactness corrosion-resistant and abrasion-resistant magnesium alloy micro arc oxidization film is good in corrosion resistant performance, stable in system, environment-friendly and non-toxic, low in cost, low in process temperature, simple in process and low in energy consumption, and industrialization can be achieved easily.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, in particular to a method for preparing a high-density, corrosion-resistant and wear-resistant magnesium alloy micro-arc oxidation film. Background technique [0002] Magnesium alloy is the metal with the lowest density among metal structural materials. It has the characteristics of large elastic modulus, good heat dissipation, good shock absorption, and large impact load capacity. It is the most promising development for light weight, environmental protection and performance optimization. Advanced metal structural materials have been applied in 3C products. However, the corrosion resistance of magnesium alloy is poor, and magnesium alloy is soft, which is easy to be corroded and scratched, which has a serious impact on the quality and appearance of 3C products. [0003] In order to improve the surface anti-corrosion and wear resistance of metal magnesium, although there are many surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
CPCC25D11/30C25D11/026
Inventor 朱阮利龙琼何杰军秦庆东杨江
Owner GUIZHOU INST OF TECH
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