六价铬钝化镀镍层,污染严重,正处于淘汰之中.开发不合六价铬的环境友好型工艺势在必行.采用新开发的三价铬钝化工艺替代传统的六价铬工艺,对化学镀镍层进行钝化,在化学镀镍层表面得到了一层超薄钝化膜.电化学测试表明,钝化处理显著提高了镀镍层的耐腐蚀性能.X射线光电子能谱(XPS)分析表明,钝化膜主要由C,O,Cr,Ni,P,N等元素组成,Ar+溅射方法算出钝化膜厚度约2～5nm.钝化膜中Cr元素主要以Cr2O3和Cr(OH),的形式存在;镀镍层的耐腐蚀性能得到了显著提高.
To control the environmental pollution caused by hexavalent chromium passivation of electroless Ni-P coating, a newly developed trivalent chromium passivation process was adopted to replace traditional hexavalent chromium passivation process, generating ultrathin passivation film atop electroless Ni-P coating. The effect of the trivalent Cr passivation film on the anticorrosion behavior of electroless Ni-P coating was investigated, and the composition of the passivation film was analyzed by means of X-ray photoelectron spectroscopy. Results indicate that the corrosion resistance of electroless Ni-P coating is greatly increased after trivalent Cr passivation, and the resulting passivation film is mainly composed of C, O, Cr, Ni, N and P, where Cr mainly exists as Cr2O3 and Cr(OH)3.
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