XPS study of the corrosion resisting composite alloying layer obtained by double glow plasma with the brush plating Ni interlayer

Jiang Xu, Xishan Xie, Zhong Xu, and Wenjin Liu Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, ChinaResearch Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China

摘 要：<正> : The Ni-Cr-Mo-Cu multi-element surface alloying with the electric brush plating Ni interlayer on the low carbon steel substrate has been investigated. By the electrochemical method in 3.5% （mass fraction） NaCl solution, the corrosion resistance of the composite alloying layer and single alloying layer is determined. The experimental results show that the corrosion resistance of the composite alloying layer is obviously better than that of the single alloying layer. The structure and composition of passive films formed on the two kinds of alloyed layers after electrochemical tests in 3.5% NaCl solution have been studied using X-ray photoe-lectron spectroscopy （XPS）. It is concluded that the double glow plasma surface alloying of low carbon steel with the electric brush plating Ni interlayer is an appropriate technique to enhance the corrosion resistance compared with the single double glow surface alloying.

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