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Al-induced electroless Co/Sn bi-layered deposition and evaluation of corrosion resistance

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Abstract

Al-induced electroless bi-layered Co/Sn coating was fabricated on a mild steel substrate by plating the Co layer as a primer and the Sn as an outer layer. This Co/Sn bi-layer coating was prepared by using a dual bath (chloride-based electroless Co and Sn bath) with varying single-layer thickness. The growth rate of the primer and outer layers was evaluated in a temperature range of 60° to 90°C. The morphology, composition, and phase structure of the coatings were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffractometer (XRD), respectively. The bi-layer coating showed a significant improvement in corrosion resistance in terms of a reduction in corrosion current and corrosion rate and an increase in polarization resistance compared to the single-layer coating.

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Acknowledgments

The authors would like to thank the Department of Science-Innovation in Science Pursuit for Inspired Research (DST-INSPIRE), the Government of India’s grant for financial support.

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Correspondence to Swatilekha Ghosh.

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Paul, I., Ghosh, S. Al-induced electroless Co/Sn bi-layered deposition and evaluation of corrosion resistance. Bull Mater Sci 47, 4 (2024). https://doi.org/10.1007/s12034-023-03073-4

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  • DOI: https://doi.org/10.1007/s12034-023-03073-4

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