Micro-arc oxidation self-assembled chemical nickel-plated coating on surface of magnesium alloy and preparation method of micro-arc oxidation self-assembled chemical nickel-plated coating

A technology of electroless nickel plating and micro-arc oxidation, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve problems such as long-term protection effect concerns, achieve low corrosion current density, and improve corrosion resistance Sexuality and easy operation

Active Publication Date: 2014-11-19
GUILIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, due to the thin film layer of the self-assembled film, its long-term protective effect in different corrosive environments is worrying. Therefore, coating treatment is often required after self-assembly

Method used

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  • Micro-arc oxidation self-assembled chemical nickel-plated coating on surface of magnesium alloy and preparation method of micro-arc oxidation self-assembled chemical nickel-plated coating

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Experimental program
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Effect test

Embodiment

[0020] (1) Pretreatment

[0021] Grind AZ91 magnesium alloy step by step with 600# and 1000# water-resistant abrasive paper, wash with water, and then degrease in alkaline degreasing solution at 60°C for 10 minutes, then wash the surface of the sample with hot water and cold water respectively, and then Ultrasonic cleaning in acetone for 10 minutes, cleaning with deionized water for 3 times, and drying with cold wind for later use; the formula of the alkaline degreasing liquid is: sodium phosphate 40g / L, sodium hydroxide 10g / L, sodium silicate 32g / L.

[0022] (2) Micro-arc oxidation

[0023] 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 adopt the pulse micro-arc oxidation method. The time is 20 minutes, the pulse frequency is 50 Hz, and the duty cycle is 30%; the formula of the micro-arc oxidation electrolyte is: sodium silicate 5 g / L, sodium fluorid...

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Abstract

The invention discloses a micro-arc oxidation self-assembled chemical nickel-plated coating on the surface of a magnesium alloy and a preparation method of the micro-arc oxidation self-assembled chemical nickel-plated coating. The coating comprises a micro-arc oxidation ceramic layer, a self-assembled layer and a chemical nickel-plated layer which are sequentially attached on the surface of the magnesium alloy. The preparation method comprises the steps of firstly, polishing a magnesium alloy matrix, washing, removing oil and carrying out other pretreatment; then, preparing a micro-arc oxidation solution, and carrying out micro-arc oxidation on the pretreated magnesium alloy to form the micro-arc oxidation ceramic layer; next, immersing the micro-arc oxidation ceramic layer into a prepared self-assembled solution to carry out immersion treatment, and forming the self-assembled layer after drying; and finally, depositing a metal nickel coating on the surface of the micro-arc oxidation self-assembled layer by using a chemical plating method. The method disclosed by the invention is simple in operation; and the prepared composite coating is low in corrosion current density, uniform and smooth in surface, good in bonding strength and capable of favorably improving the corrosion resistance of the magnesium alloy.

Description

technical field [0001] The invention relates to the technical field of high corrosion-resistant composite coating protection on the surface of metal materials, in particular to a micro-arc oxidation self-assembled chemical nickel plating coating on the surface of a magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy has the characteristics of light weight, high strength, impact resistance, wear resistance, good attenuation performance, high thermal and electrical conductivity, non-magnetic, good shielding and non-toxic. It is of great significance in the development and application prospects of non-ferrous metal materials. However, because the electrode potential of metal magnesium is very negative, it is a relatively active metal, and its stability is poor, and its poor corrosion resistance limits its industrial application to a large extent. Therefore, improving the comprehensive protection performance of magnesium alloy is the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C25D11/30C23C26/00C23C18/36
Inventor 尚伟王旭峰温玉清
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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