Method for preparing multilayer high corrosion resistant-wear resistant composite protective coating on magnesium alloy surface

Abstract

The invention relates to a method for preparing a multilayer high corrosion resistant-wear resistant composite protective coating on a magnesium alloy surface, belonging to the technical field of metal surface treatment. The method comprises the following steps that: first, carrying out plasma anodization on a magnesium alloy to form a porous ceramic layer growing on the matrix surface, then, carrying out organic coating hole sealing treatment on the coating, carrying out chemical plating the treated coating to form an Ni-P coating, finally, carrying out electroplating to form a high corrosion resistant-wear resistant Ni-P coating. According to the invention, by the prepared composite protective coating comprising the ceramic layer, the organic coating and the nickel coating on the magnesium alloy surface, the high protection and high wear resistance of the magnesium alloy matrix are realized. According to the invention, the defect of single surface treatment technique of the magnesium alloy is overcome, and the multilayer composite coating formed on the magnesium alloy surface has characteristics of good bonding force, high rigidity, corrosion resistance and wear resistance, thusbeing an ideal protective coating for magnesium alloy, meeting the protective requirements of the magnesium alloy products in the harsh environment.

Description

technical field

[0001] The invention relates to a method for preparing a multi-layer high corrosion-resistant and wear-resistant composite protective layer on the surface of a magnesium alloy, and belongs to the technical field of metal surface treatment. Background technique

[0002] As a very important light metal material, magnesium alloy is the metal with the smallest density among metal structural materials. Compared with aluminum alloy, magnesium alloy can increase the weight reduction potential by 20-25%, which can meet the requirements of light weight for household appliances, communication electronic devices and automobiles. Quantitative requirements. Magnesium alloy also has superior properties such as high specific strength, high specific stiffness, good damping, good thermal conductivity, and good vibration damping. Wide application prospects. In recent years, the automobile industry has put forward more urgent requirements for the weight reduction of automobil...