Electrochemical properties and structure of vanadium-based conversion coatings on electro-galvanised steel

被引：1

作者：

Okai, K. ^{[1
]}

Matsuzaki, A. ^{[2
]}

机构：

[1] JFE Steel Corp, Steel Res Lab, 1-1 Minamiwatarida Cho, Kawasaki, Kanagawa, Japan

[2] JFE Steel Corp, Steel Res Lab, Fukuyama, Hiroshima, Japan

来源：

TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING | 2018年 / 96卷 / 04期

关键词：

Electro-galvanised steel; conversion coating; chromate-free; vanadium; phosphoric acid; corrosion; coating structure; DOPED SILANE SOLUTIONS; CORROSION-RESISTANCE; OXIDE; ZINC; XPS; PRETREATMENTS; PHOTOELECTRON; SPECTROSCOPY; PERFORMANCE; PHOSPHATE;

D O I：

10.1080/00202967.2018.1475146

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The corrosion resistance of vanadium-based conversion coatings on electro-galvanised steel (EG) was examined in terms of the different valence species V5+ and V4+ as the raw material in the treatment solution. The effects of mixing phosphoric acid with the vanadium-based conversion coating have also been investigated. Corrosion performance was tested by neutral salt spray test and the mechanism of corrosion resistance was analysed by electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy. It was found that conversion coatings formed from V5+ or V4+ did not clearly show different corrosion behaviour, but that the addition of phosphoric acid to the solution including V5+ improved corrosion protection. These results indicate that mixing phosphoric acid lowers the pH of the solution and improves corrosion resistance. The role of phosphoric acid is also explained by the formation of hydrogen bonds at the interface between the vanadium species and EG substrate.

引用

页码：193 / 199

页数：7

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