喷涂锌铝(ZAZA)覆盖层在海洋环境中的腐蚀

Corrosion Behavior of Sprayed Zinc-aluminum (ZAZA) Coatings in Marine Environment

采用热喷涂工艺制备了ZAZA锌铝涂层,并对部分试样涂刷氯化橡胶面漆进行封闭处理,通过外海现场挂片、盐雾及电化学阻抗试验,研究了其防腐蚀性能及腐蚀机理,并利用扫描电镜（SEM）对涂层形貌进行了分析。结果表明,金属涂层存在孔隙或缺陷使其防护能力下降。有机涂层封闭能改善其防腐蚀效果,延长使用寿命。

The zinc-aluminum coatings were prepared by means of thermal spray,some samples were sealed with chlorinated rubber paint,and the corrosion behavior and mechanism were studied by eposure tests in sea,salt spray testing and electrochemical impedance spectroscopy（EIS）.Scanning electron microscopy（SEM） was employed to assess the micromophology of the coatings.The results showed that the structure of the zinc-aluminum coatings was porous and with some defects,which would lower the protection effect.The organic coating could improve the protection effect and prolong the protection life through sealing the defects of the metal coating.