Improvement in corrosion resistance of ternary Zn-Fe-Mo plating by additional Mo-oxide coating

SURFACE & COATINGS TECHNOLOGY

卷:389

Article; Proceedings Paper

Park, Jae-Hyeok¹  Kosugi, Daichi¹  Hagio, Takeshi^1,2  Kamimoto, Yuki^1,2  Ichino, Ryoichi^1,2,3  Lee, Myeong-Hoon⁴ 

[1] Nagoya Univ, Grad Sch Engn, Dept Chem Syst Engn, Nagoya, Aichi, Japan

[2] Nagoya Univ, Inst Mat Innovat, Inst Innovat Future Soc, Nagoya, Aichi, Japan

[3] Nagoya Univ, Global Res Inst Mobil Soc, Inst Innovat Future Soc, Nagoya, Aichi, Japan

[4] Korea Maritime & Ocean Univ, Dept Marine Engn, Busan, South Korea

关键词: Alternative plating;    Ternary Zn-Fe-Mo plating;    Mo-oxide coating;    Corrosion resistance;    Multi-layer structure;    Corrosion product;   

DOI  :  10.1016/j.surfcoat.2020.125567

来源: Elsevier

【 摘 要 】

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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