Chemical nickel plating process of Mg-Gd-Y-Zr magnesium alloy

Abstract

The invention relates to a chemical nickel plating method of an Mg-Gd-Y-Zr (wt%) magnesium alloy. The method comprises pre-plating pretreatment of a magnesium alloy matrix and deposition of a chemical nickel plating layer through chemical nickel plating, wherein the pre-plating pretreatment process comprises five steps of removing oil, activating, acid-washing, reactivating and zinc galvanizing; chemical nickel plating solution takes basic nickel carbonate as main salt, sodium hypophosphite as a reducing agent, hydrofluoric acid as a corrosion inhibitor, lactic acid as a complex agent and mixed liquor of cadmium sulfate and potassium iodate as a brightening agent; and a plating component is subject to zinc galvanizing and then electroless plating at the temperature about 85 DEG C to obtain the bright, flat, uniform and compact nickel plating layer. The chemical nickel plating method is applicable to chemical nickel plating on the surface of the Mg-Gd-Y-Zr magnesium alloy, thus achieving the purpose of protecting the magnesium alloy. The chemical nickel plating method has the advantages of fast plating speed, good protectiveness, simple operation and easy control.

Description

technical field [0001] The invention relates to a Mg-Gd-Y-Zr magnesium alloy electroless nickel plating process, which belongs to the field of metal corrosion and protection. Background technique [0002] Magnesium alloys have excellent properties such as high specific strength, good impact resistance, and light weight, making them have broad application prospects in aerospace, electronics, and automotive industries. However, magnesium alloys have high chemical activity and are prone to corrosion, so their poor corrosion resistance restricts their further popularization and application. Therefore, magnesium alloys must be subjected to surface protection treatment before practical application. Electroless nickel plating is one of the simplest and most economical surface protection technologies widely used, which can make magnesium alloys obtain good corrosion resistance and wear resistance, as well as weldability and electrical conductivity as well as metallic texture and ap...

AI Technical Summary

Problems solved by technology

However, there are very few research reports on the surface protection technology of Mg-Gd-Y-Zr alloys.

Magnesium alloys are difficult-to-plate substrates, so pre-plating pretreatment is necessary, and the substrate has a great influence on pre-treatment. The existing pre-treatment methods are not suitable for Mg-Gd-Y-Zr magnesium alloys, resulting in There are many problems in the process, such as partial failure to be plated, defects such as peeling and bubbling

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