Online from: 1954
Subject Area: Mechanical & Materials Engineering
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|Title:||Development of anti-corrosive multi-layered coatings of zinc-nickel alloy|
|Author(s):||Yogesha Subbaiah, (Electrochemistry Research Laboratory, Department of Chemistry, NITK, Surathkal, India), Venkatakrishna Kaje, (Electrochemistry Research Laboratory, Department of Chemistry, NITK, Surathkal, India), Ampar Chitharanjan Hegde, (Electrochemistry Research Laboratory, Department of Chemistry, NITK, Surathkal, India)|
|Citation:||Yogesha Subbaiah, Venkatakrishna Kaje, Ampar Chitharanjan Hegde, (2011) "Development of anti-corrosive multi-layered coatings of zinc-nickel alloy", Anti-Corrosion Methods and Materials, Vol. 58 Iss: 2, pp.84 - 89|
|Keywords:||Alloys, Coatings, Corrosion resistance, Spectroscopy, Steel|
|Article type:||Research paper|
|DOI:||10.1108/00035591111110732 (Permanent URL)|
|Publisher:||Emerald Group Publishing Limited|
|Acknowledgements:||This work was supported by the Department of Science Technology (DST), New Delhi, (No. SR/S2/CMP/0059/2006, dated 22-10-2007).|
Purpose – The purpose of this paper is to develop and optimize anti-corrosive multi-layered coatings of zinc-nickel alloy on carbon steel.
Design/methodology/approach – A variety of composition-modulated multi-layer alloy (CMMA) coatings of zinc-nickel were developed on a carbon steel substrate by cyclic changes in cathode current during electrodeposition, coupled with variation of the thicknesses of the individual layers. The corrosion behavior of the coatings was studied in 5 percent NaCl solution by electrochemical methods. Cyclic cathode current densities (CCCDs) and the number of alloy layers were optimized for highest performance of the coatings against corrosion. The factors responsible for improved corrosion resistance were analyzed in terms of change in the intrinsic electrical properties of the capacitance value at the electrical double layer that was associated with micro/nanometric layering. The formation of the semi-conductive surface film, which was responsible for the improved corrosion resistance, was supported by a Mott-Schottky plot and the cyclic polarization study. The formation of multi-layered deposit and the mechanism of corrosion degradation of the coating were analyzed using scanning electron microscopy.
Findings – CMMA coatings with an optimal configuration of (Zn-Ni)
Originality/value – The paper describes the optimization of CCCD and the number of deposited layers by development of electrolytic deposition of anti-corrosive multi-layered zinc-nickel coatings from a single plating technique.
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