Galvanic Formation of Zn-Ni/Zn-Co Type Multilayer Alloy Coatings on Steel Substrate

Abstract:

Zn-Ni and Zn-Co monolayer and Zn-Ni/Zn-Co multilayer (from 2 to 128 layers) alloy coatings were formed on steel substrate by electrodeposition from acidic Zn-Ni bath and neutral Zn-Co bath. Samples were tested in salt chamber for corrosion resistance in neutral salt spray. Open circuit potential measurement and gravimetric study of corrosion were carried for samples immersed in the 5% NaCl solution.It was found that coatings of Zn-Ni surface layer occurred higher corrosion resistance then the coatings of Zn-Co surface layer. Sixteen-layer coating with Zn-Ni surface layer proved to be most effective in protecting the steel substrate. Zn-Ni monolayer showed the lowest corrosion potential, which affects the corrosion properties. Sample weight changes during exposure to a corrosive environment are related to digestion of the coating and the formation of corrosion products.

• Periodical: Solid State Phenomena (Volume 227)
• Pages: 147-150
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.227.147
• Online since: January 2015
• Authors: Agnieszka Nagrabia, Maciej Sowa, Wojciech Simka, Artur Maciej*
• Keywords: Corrosion, Multilayer Alloy Coatings, NSS Method, Zn-Co Coating, Zn-Ni Coating

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