Composition and formation analysis of an ultra-thin antitarnish passive film on electroless Ni-P coating
Composition and formation analysis of an ultra-thin antitarnish passive film on electroless Ni-P coating
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化学镀Ni-P镀层超薄防锈钝化膜的成分及形成分析
DOI：
10.1016/j.electacta.2014.01.119
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发表时间：
2014-04
影响因子：
6.6
通讯作者：
Du, Jun
中科院分区：
文献类型：
--
作者：
Mu, Songlin;Li, Wenfang;Du, Jun
采用钝化液对化学镀镍磷层进行处理，获得了超薄钝化膜。采用酸暴露法和动电位极化法研究了膜层的抗变色性和耐蚀性。利用XPS分析了薄膜的化学组成和成膜过程。酸暴露试验表明，钝化处理可明显提高镀层的抗变色性能。动电位极化曲线表明，钝化后的Ni-P镀层的腐蚀电流低于未钝化的镀层。通过XPS测试，膜层厚度为几个纳米，膜层由Cr、C、O和N组成。膜中的N、C元素表明硝基芳香族化合物参与了成膜过程。XPS谱拟合结果表明，Cr以Cr2 O3和Cr（OH）3的形式存在，O以Cr2 O3、Cr（OH）3和-NO2的形式存在于芳香族化合物中。并利用XPS分析结果对钝化膜的形成机理进行了验证。
An ultra-thin passive film on electroless nickel phosphorus coating (ENPC) was obtained by treated in a passivation bath. The antitarnish and corrosion properties of the film were studied by acid exposure and potentiodynamic polarization. XPS was utilized to analyze the chemical composition and formation process of the film. The acid exposure test indicated the antitarnish property of the coating was obviously improved by passivation treatment. The potentiodynamic polarization test showed that the corrosion current for the passivated Ni-P coating was lower than that of untreated coating. By XPS measurement, the thickness of film was evaluated as a few nanometers and the film was made up of Cr, C, O and N. The N and C elements in the film suggested the nitryl aromatic compound should take part in the formation of film. The XPS spectra fitting results indicated that Cr was in the form of Cr2O3and Cr(OH)3, while O was originated to Cr2O3, Cr(OH)3and–NO2in aromatic compound. And the XPS results were used to justify the formation mechanism of the passive film.
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