【摘要】 用能谱与SEM分析,发现加入稀土硝酸盐(REN)后明显提高了无定形晶体Zn2Fe(PO4)2在磷化膜表面的覆盖率,而使得膜的耐蚀性能提高.此时膜内相关元素含量比例发生了变化:P增大,Zn减小,可见磷对膜耐蚀性的贡献比锌大.讨论认为,稀土硝酸盐是一个有良好载氧能力的催化剂,具有良好的成核促进作用和阴极去极化作用,从而能加速磷化并使膜的耐腐蚀性能提高.更多还原

【Abstract】 Through observation of surface morphology of the zinc phosphate coatings on a steel by SEM,it was ascertained that the coatings gained in a bath with REN addition,incomparison to the coatings got in a bath without REN,show better corrosion resistance because of increasing of covering rate of Zn₂Fe（PO₄）₂ crystals on the surface,as well as of increasing P content,while decreasing Zn content of the coatings.Finally the relevant mechanism was also discussed.更多还原