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Method for coloring magnesium alloy composite film by micro-arc oxidation

A micro-arc oxidation and magnesium alloy technology, applied in the direction of anodizing, can solve the problems of differences and high chemical activity of magnesium alloys, and achieve the effect of uniform corrosion resistance

Inactive Publication Date: 2014-02-05
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, magnesium alloys have high chemical activity and are more prone to corrosion than aluminum alloys. Therefore, the coloring technology of oxide films on the surface of magnesium alloys is significantly different from that of aluminum alloys.

Method used

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  • Method for coloring magnesium alloy composite film by micro-arc oxidation

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Embodiment

[0014] (1) Grind AZ91 magnesium alloy step by step with 300#, 600#, 1000# water-resistant abrasive paper, wash with water, and then degrease in alkaline degreasing liquid. The formula of alkaline degreasing liquid is: sodium phosphate: 40g / L , sodium hydroxide: 10g / L, sodium silicate: 32g / L, degreasing temperature is 60°C, after 10 minutes of degreasing, wash the surface of the sample with hot water and cold water respectively, and then ultrasonically clean in acetone for 10 minutes , washed 3 times with deionized water, and dried with cold air for later use.

[0015] (2) Put the AZ91 magnesium alloy treated in step (1) into the micro-arc oxidation electrolyte as the anode for micro-arc oxidation treatment, the cathode is stainless steel, and the formula of the micro-arc oxidation electrolyte is: sodium aluminate 30 g / L , sodium hydroxide 20g / L, montmorillonite 3g / L, gum arabic 2g / L. The pulsed micro-arc oxidation method is adopted, and the process parameters are: the termina...

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Abstract

The invention discloses a method for coloring a magnesium alloy composite film by micro-arc oxidation. The method comprises the following steps: (1) grinding an AZ91 magnesium alloy, washing with water, washing with alkali, washing with water, cleaning with ultrasonic waves and washing with deionized water for 2-3 times; (2) placing the AZ91 magnesium alloy serving as an anode in a micro-arc oxidation electrolyte and carrying out micro-arc oxidation treatment, wherein the cathode is stainless steel; (3) dissolving 1-10ml of ethyl Orthosilicate in 40-50ml of absolute ethyl alcohol; adding 1-2g of zirconium oxychloride; magnetically stirring for 0.5-1.5 hours at constant temperature in a 50 DEG C water bath; adding 0.1-0.5g of copper sulfate pentahydrate and 5-20mg of glucose and continuously stirring for 0.5-1 hour at 50 DEG C; after the liquor is cooled, obtaining a green SiO2-ZrO3 colloid; and (4) immersing a micro-arc oxidation film sample in the SiO2-ZrO3 colloid; soaking; slowly pulling the sample out at a uniform velocity; repeatedly pulling the sample twice; drying; soaking again; slowly pulling the sample out at the uniform velocity; drying; then heating to 150-200 DEG C; and curing for 0.5-1 hour. According to the method disclosed by the invention for surface treatment of the magnesium alloy, a uniform green film with high corrosion resistance can be obtained.

Description

technical field [0001] The invention relates to the field of magnesium alloy surface treatment, in particular to a method for coloring a magnesium alloy micro-arc oxidation composite film. Background technique [0002] Micro-arc oxidation technology is to place aluminum, magnesium, titanium and other valve metals and their alloys in the electrolyte, and use electrochemical methods to generate spark discharge spots on the surface of the material. Under the combined action of thermochemistry, plasma chemistry and electrochemical , to generate a ceramic oxide film layer. The micro-arc oxidation technology has the characteristics of simple process, high efficiency, no pollution, and strong ability to process workpieces. The ceramic film prepared by this method has a compact structure, a firm bond with the substrate, wear resistance, corrosion resistance, high hardness, and electrical insulation properties. Good and other advantages. It has good application prospects in industr...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 尚伟温玉清
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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