Ni-P镀层三价铬超薄钝化膜的组成与耐腐蚀性能  

Composition and Anticorrosion Behavior of Trivalent Chromium Passivation Film on Electroless Ni-P Coating

作　　者：穆松林[1] 李宁[1] 黎德育[1] 徐丽英[1] 

机构地区：[1]哈尔滨工业大学应用化学系,黑龙江哈尔滨150001

出　　处：《材料保护》2010年第4期101-104,共4页Materials Protection

摘　　要：六价铬钝化镀镍层,污染严重,正处于淘汰之中。开发不含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)3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 chro-mium passivation of electroless Ni-P coating,a newly developed trivalent chromium passivation process was adopted to replace tra-ditional hexavalent chromium passivation process,generating ul-trathin 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 ofthe 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 pas-sivation,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.

关 键 词：化学镀镍层 三价铬钝化 耐腐蚀性能 XPS分析 

分 类 号：TG174.4[金属学及工艺—金属表面处理]