期刊
SURFACE & COATINGS TECHNOLOGY
卷 389, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2020.125567
关键词
Alternative plating; Ternary Zn-Fe-Mo plating; Mo-oxide coating; Corrosion resistance; Multi-layer structure; Corrosion product
资金
- Japan Science and Technology Agency (JST)-OPERA Program, Japan [JPMJOP1843]
Despite the excellent corrosion resistance and the widespread application of Zn-Ni plating in industrial fields, the toxicity of Ni to the human body has caused the demand for alternative plating that does not contain harmful elements. In this respect, ternary Zn-Fe-Mo plating, which includes a third element Mo in binary Zn-Fe plating, has been considered as a promising alternative for Zn-Ni plating. In this study, the corrosion resistance of ternary Zn-Fe-Mo plating was evaluated and compared with conventional Zn and Zn-Fe plating by impedance measurements and cyclic corrosion tests (CCT). Furthermore, formation of a multi-layer structure via additional Mo-oxide coating over the ternary Zn-Fe-Mo plating was attempted to increase the corrosion resistance. Experimental results show that ternary Zn-Fe-Mo plating has higher impedance but lower corrosion resistance for CCT and that the Mo-oxide coating significantly enhances the corrosion resistance of the ternary Zn-Fe-Mo plating selectively by a factor of approximately 10. The role of the formation of multi-layer structure in improving the corrosion resistance of the ternary Zn-Fe-Mo plating is discussed through the structure change of the plating and the generated corrosion products.
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