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

Simbarashe Fashu*, Rajwali Khan

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

10 Scopus citations

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.

Original languageEnglish
Pages (from-to)45-60
Number of pages16
JournalAnti-Corrosion Methods and Materials
Volume66
Issue number1
DOIs
StatePublished - 24 Jan 2019
Externally publishedYes

Keywords

  • Cathodic protection
  • Corrosion
  • Corrosion science

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