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

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 thir...

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Bibliographic Details
Published in:Surface & coatings technology 2020-05, Vol.389, p.125567, Article 125567
Main Authors: Park, Jae-Hyeok, Kosugi, Daichi, Hagio, Takeshi, Kamimoto, Yuki, Ichino, Ryoichi, Lee, Myeong-Hoon
Format: Article
Language:English
Subjects:
Alternative plating
Corrosion product
Corrosion products
Corrosion resistance
Corrosion tests
Impedance
Iron
Mo-oxide coating
Molybdenum
Multi-layer structure
Multilayers
Nickel plating
Oxide coatings
Protective coatings
Ternary Zn-Fe-Mo plating
Toxicity
Zinc plating
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Summary: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. [Display omitted] •Mo-oxide was laminated over Zn-Fe-Mo plating to enhance corrosion resistance.•Zn-Fe-Mo plating showed high impedance but low corrosion resistance in CCT.•Corrosion resistance of Zn-Fe-Mo plating enhanced about 10 times by Mo-oxide lamination.•The multi-layer structure promoted the formation of protective corrosion products.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2020.125567