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Recent work on electrochemical deposition of Zn-Ni (-X) alloys for corrosion protection of steel

Simbarashe Fashu (Department of Materials Science and Technology, Harare Institute of Technology, Harare, Zimbabwe)
Rajwali Khan (Department of Physics, Abdul Wali Khan University, Mardan, Pakistan)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 29 November 2018

Issue publication date: 24 January 2019

457

Abstract

Purpose

Thin coatings are of great importance to minimize corrosion attack of steel in different environments. A review of recent work on electrodeposition and corrosion performance of Zn-Ni-based alloys for sacrificial corrosion protection of ferrous substrates is presented. The purpose of this study is to provide a systematic comparison of the corrosion resistances of Zn-Ni alloy coatings. The review contains key and outstanding comparisons of references for the period from 2007 to 2017. Binary and ternary Zn-Ni-based alloys were compared and contrasted to provide a good knowledge basis for selection of best coating system to steel substrates.

Design/methodology/approach

This article is a review article.

Findings

Zn-Ni-(X) alloys show great potential for replacing Cd metal in corrosion protection of steel substrates.

Practical implications

The research on plating of binary Zn-Ni alloys from aqueous electrolytes is now well advanced and these alloys show improved corrosion resistance compared to pure Zn. Pulse plated and compositionally modulated multilayer Zn-Ni alloy coatings showed enhanced corrosion properties compared to direct plated Zn-Ni coatings of similar composition.

Originality/value

The work on electrodeposition of Zn-Ni based alloys from ionic liquids is still scarce, yet these liquids show great promise in improving corrosion resistance and reducing coating thickness when compared to aqueous electrolytes. Advanced plating techniques in ionic liquids such as electromagnetic, compositionally modulated multilayer, pulse plating, ternary alloys and composites should be considered as these electrolytes avoid water chemistry and associated defects.

Keywords

Acknowledgements

The authors would like to thank A. Mukuya, the Lecturer at Harare Institute of Technology, Zimbabwe, for proof reading this article.

Citation

Fashu, S. and Khan, R. (2019), "Recent work on electrochemical deposition of Zn-Ni (-X) alloys for corrosion protection of steel", Anti-Corrosion Methods and Materials, Vol. 66 No. 1, pp. 45-60. https://doi.org/10.1108/ACMM-06-2018-1957

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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