Corrosion behavior and composition analysis of chromate passive film on electroless Ni-P coating
Corrosion behavior and composition analysis of chromate passive film on electroless Ni-P coating
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DOI：
10.1016/j.apsusc.2010.01.089
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发表时间：
2010-04-15
影响因子：
6.7
通讯作者：
Xu, Liying
中科院分区：
文献类型：
--
作者：
Mu, Songlin;Li, Ning;Xu, Liying
在K2Cr2O7用量为30g/L的镀液中，在化学镀Ni-P层上形成钝化膜，用X射线光电子能谱(XPS)和电化学方法分析了其化学成分和腐蚀行为。动电位极化测试表明，钝化样品的腐蚀电流是电镀前的1/30。XPS分析表明，薄膜由铬、镍和氧组成。根据Ar+离子的溅射速率估算薄膜厚度为几个纳米。高分辨率的XPS谱表明，薄膜中检测到的铬是以三价化合物的形式存在的，即Cr2O3和Cr(OH)(3)。(C)2010爱思唯尔B.V.保留所有权利。
A passive film was formed on electroless Ni-P coating (ENPC) in a bath of K2Cr2O7 30 g/l. XPS and electrochemical methods were employed to analyze its chemical compositions and corrosion behaviors. The potentiodynamic polarization tests indicated the corrosion current of the passivated sample was 1/30 that of as-plated ENPC. The XPS analysis illustrated the film comprised Cr, Ni and O. The film thickness was evaluated to be a few nanometers according to the sputtering rate of Ar+ ion. High-resolution XPS spectra suggested that the detected Cr in film was in the form of trivalent compounds, Cr2O3 and Cr(OH)(3). (C) 2010 Elsevier B.V. All rights reserved.