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Electrolytic preparation of cyclic multilayer Zn–Ni alloy coating using switching cathode current densities

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Abstract

Cyclic multilayer alloy (CMA) coating of Zn–Ni was developed on mild steel using single bath technique, by proper manipulation of cathode current densities. The thickness and composition of the individual layers were altered precisely and conveniently by cyclic modulation of cathode current densities. Multilayer coatings, having sharp change in compositions were developed using square current pulses. Gelatin and sulphanilic acid (SA) acid were used as additives. Laminar deposits with different configurations were produced, and their corrosion behaviors were studied, in 5% NaCl solution by electrochemical methods. It was observed that the corrosion resistance of CMA coating increased progressively with number of layers (up to certain optimal numbers) and then decreased. Cyclic voltammetry study demonstrated the role of gelatin and SA in multilayer coating. The coating configuration has been optimized for the peak performance against corrosion. The substantial decrease of corrosion rate, in the case of multilayer coatings was attributed to the changed intrinsic electric properties, evidenced by Electrochemical Impedance Spectroscopy (EIS) study. The surface morphology and its roughness were examined by Atomic Force Microscopy (AFM). The surface and cross-sectional view of coatings were examined, using Scanning Electron Microscopy (SEM). X-ray photoelectron spectrum (XPS) study was carried out for surface analysis. The relative performance of pure Zn, monolithic and CMA coatings were compared and discussed.

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Acknowledgments

The authors thank Prof. Noam Eliaz, School of Mechanical Engineering, Tel-Aviv University, Israel for support in carrying out few analyses. We also thank Mario Levinstein from the Biomaterials and Corrosion Lab for his machinery and AFM work and Zahava Barkay, Larisa Burstein and Yuri Rosenberg from the Wolfson Applied Materials Research Center for their help.

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Authors and Affiliations

  1. Electrochemistry Research Laboratory, Department of Chemistry, National Institute of Technology Karnataka, Srinivasnagar, 575 025, India

    K. Venkatakrishna & A. Chitharanjan Hegde

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  1. K. Venkatakrishna
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  2. A. Chitharanjan Hegde
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Correspondence to A. Chitharanjan Hegde.

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Venkatakrishna, K., Chitharanjan Hegde, A. Electrolytic preparation of cyclic multilayer Zn–Ni alloy coating using switching cathode current densities. J Appl Electrochem 40, 2051–2059 (2010). https://doi.org/10.1007/s10800-010-0186-7

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  • DOI: https://doi.org/10.1007/s10800-010-0186-7

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