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 passivated films on electrodeposited Zn-Fe, Zn-Co, Zn-Ni alloys was 2-4 times higher than that on Zn. Results of XPS and AES showed that all these passive films were composed of CrO3, Cr2O3, Zn(OH)2, ZnO and H2O, and the relative contents of CrO3/Cr2O3 and Zn(OH)2/ZnO were basically the same. The only difference was that the total content of Cr in passivated film on electrodeposited zinc alloys was higher. It led to an integrated and fine protective film, which possessed self-repair ability. In addition, the presence of an iron-group metal enriched layer obstructed the corrosion process.
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