Ni-Sn-P合金镀层在人工海水中的腐蚀行为及腐蚀机理

doi:10.3969/j.issn.0438-1157.2013.04.032

化工学报 ›› 2013, Vol. 64 ›› Issue (4): 1359-1363.DOI: 10.3969/j.issn.0438-1157.2013.04.032

Ni-Sn-P合金镀层在人工海水中的腐蚀行为及腐蚀机理

王宏智, 吴强, 张智贤, 姚素微, 张卫国

天津大学化工学院,天津 300072

收稿日期:2012-08-12 修回日期:2012-09-12 出版日期:2013-04-05 发布日期:2013-04-05
通讯作者: 张卫国
作者简介:王宏智(1973—),男,副教授,博士。

Corrosion behavior and mechanism of Ni-Sn-P alloy coatings in artificial sea water

WANG Hongzhi, WU Qiang, ZHANG Zhixian, YAO Suwei, ZHANG Weiguo

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

Received:2012-08-12 Revised:2012-09-12 Online:2013-04-05 Published:2013-04-05

摘要/Abstract

摘要： 利用扫描电子显微镜(SEM)和能谱(EDS)测试了电镀Ni-Sn-P合金镀层在人工海水中腐蚀前后表面形貌和合金成分的变化,结合X射线光电子能谱(XPS)对腐蚀后合金表面的组成进行了分析,并在此基础上探讨了Ni-Sn-P合金镀层在人工海水中的腐蚀机理。研究结果表明:电镀Ni-Sn-P合金在人工海水中耐蚀性优于Ni-P合金,由于人工海水中的氯离子的穿透效应而出现的局部腐蚀孔数较Ni-P合金大幅减少,腐蚀后Ni-Sn-P合金表面形成由SnO₂、SnCl₄、Ni₃(PO₄)₂、NiO和Ni(OH)₂组成的膜层,对合金耐蚀性的提高起到重要作用。

关键词: Ni-Sn-P合金镀层, 腐蚀机理, 人工海水, 钝化膜

Abstract: The changes of microscopic morphology and elemental composition of Ni-Sn-P alloy coatings before and after corrosion in artificial sea water were studied with scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), and the corrosion products were examined with X-ray photoelectron spectroscopy (XPS).The corrosion mechanism of Ni-Sn-P alloy coatings in artificial sea water is discussed.EIS spectra and SEM showed that the corrosion resistance of electroplating Ni-Sn-P alloy in artificial seawater was better than Ni-P alloy, and the number of localized corrosion hole caused by penetration effect of Cl^- was greatly reduced.After corrosion a layer of passive film composed of SnO₂, SnCl₄, Ni₃(PO₄)₂, NiO and Ni(OH)₂ was formed on the surface of Ni-Sn-P alloy, which played an important role in improving Ni-Sn-P alloy coatings corrosion resistance.

Key words: Ni-Sn-P alloy coatings, corrosion mechanism, artificial sea water, passive film

中图分类号:

O646.6

王宏智, 吴强, 张智贤, 姚素微, 张卫国. Ni-Sn-P合金镀层在人工海水中的腐蚀行为及腐蚀机理[J]. 化工学报, 2013, 64(4): 1359-1363.

WANG Hongzhi, WU Qiang, ZHANG Zhixian, YAO Suwei, ZHANG Weiguo. Corrosion behavior and mechanism of Ni-Sn-P alloy coatings in artificial sea water[J]. CIESC Journal, 2013, 64(4): 1359-1363.

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Ni-Sn-P合金镀层在人工海水中的腐蚀行为及腐蚀机理

Corrosion behavior and mechanism of Ni-Sn-P alloy coatings in artificial sea water

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