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.
出处
《材料保护》
CAS
CSCD
北大核心
2010年第4期101-104,共4页
Materials Protection
关键词
化学镀镍层
三价铬钝化
耐腐蚀性能
XPS分析
electroless Ni-P coating
trivalent chromium passiva-tion
anticorrosion behavior
X-ray photoelectron spectroscopy
