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

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...

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