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防护性锌基合金(Zn-Ni、Zn-Fe、Zn-Co)镀层钝化膜的耐蚀性比锌镀层钝化膜提高2～4倍。XPS及AES分析表明,合金镀层钝化膜与锌镀层钝化膜均由CrO_3、Cr_2O_3、Zn(OH)_2、ZnO及H_2O等组成,并且CrO_3/Cr_2O_3的相对含量和Zn(OH)_2/ZnO的相对含量也基本相同。它们的区别在于:合金镀层钝化膜中总铬量较高,膜层完整、致密,镀层/钝化膜界面存在铁系金属的富集层,这是锌基合金镀层钝化膜具有高耐蚀性的主要原因。
The corrosion resistance of the passivation film of the protective zinc-based alloy (Zn-Ni, Zn-Fe, Zn-Co) coating is 2 to 4 times higher than that of the passivation film of the zinc coating. XPS and AES analysis showed that both the passivation film and the passivation film of zinc coating consist of CrO_3, Cr_2O_3, Zn (OH) _2, ZnO and H_2O, and the relative contents of CrO_3 / Cr_2O_3 and Zn (OH) _2 / ZnO The relative content is also basically the same. The difference between them is that the total chromium content in the passivation film of the alloy coating is high, the film is complete and dense, and the iron-based metal enrichment layer exists on the coating / passivation film interface, which is a zinc-based alloy coating passivation film with high resistance The main reason for the erosion.