Surface pretreatment of magnesium alloy

The preparation principle of magnesium alloy electroplating surface is similar to that of many other metals. First of all, the pollution on the surface of magnesium alloy must be removed by cleaning. Then according to the requirements of surface decoration, the treatment method is selected. The treatment methods are as follows: spraying glass or plastic beads, pickling, rolling, polishing or polishing. The surface contamination caused by these methods must be removed by other cleaning methods. According to the type of contamination, the surface of magnesium alloy must be chemically activated before direct nickel plating or zinc plating.


Careful surface preparation is a necessary condition for high quality coating on magnesium alloy. The machined surface of the plated parts shall be smooth, free of scratches, burrs and sharp corners. It shall be cleaned, degreased and pickled just like oxidation. The specific pretreatment steps of magnesium and magnesium alloy plating are as follows: chemical degreasing - cold water cleaning - acid washing - activation treatment - cold water washing - etching - cold water washing - flash copper plating, copper pre plating - cold water washing - deionized water washing - pre nickel plating - cold water washing - deionized water washing - electroless nickel plating - cold water washing - drying. The purpose of pickling is to remove the natural oxide film on the surface of metal. The pickling of magnesium has its own requirements.