摘要
Abstract
The morphology, structure and phase of rare earth conversion coating were characterized by SEM,XPS and XRD. The corrosion resistance of rare earth conversion coating,zinc coating and lowchromium conversion coating were compared by immersion experiments, the neutral salt spray tests and electro-chemical testing methods. The corrosion kinetic parameters of rare earth conversion coating were measured in 5 ％ NaCl solution. The results showed that rare earth conversion coating was formed by tiny fine particles without cracks and less defects, which was composed of zinc and cerium oxides and hydroxides, hindered O2 transmission and electronic transmission, inhibited both reactions of anodic and cathodic of corrosions, decreased corrosion kinetics and protected matrix from corrosion effectively. It improved the corrosion resistance performance of zinc plating, whose corrosion resistance was better than that of low-chromium conversion coating.关键词
锌镀层/稀土转化膜/耐蚀性能/耐蚀机理Key words
zinc plating/ rare earth conversion coating/ corrosion resistance/ anti-corrosion mechanism分类
矿业与冶金
