基底表面质量对ZK60镁合金镀镍层性能的影响

Nickel plating on the surface of magnesium alloy is widely used in the anti-corrosion of magnesium alloy workpiece, but blistering and peeling from nickel plating will seriously affect service life of the workpiece. In this paper, effects of the substrate surfaces quality on properties of nickel plating of ZK60 magnesium alloy were studied. The results show that the surface scratch and corrosive pitting significantly reduce the coating quality and cause blistering and peeling from nickel plating. The surface scratch of the substrate will retain in the nickel plating layer, which makes the coating thinner, and causes stress concentration in the coating, and increases the probability of coating cracking. Differences in electrochemical properties between impurities in pitting pits and magnesium substrate lead to thinning of the coating and weaken the adhesion of the coating. Therefore, good substrate surface finish and removal corrosive pitting of substrate surface are the guarantee for improving quality of nickel plating of magnesium alloy workpiece.