Abstract
The present work deals with the galvanostatic fabrication of Ni–Fe nanostructured composition-modulated multilayer alloy (CMMA) coatings on steel panel from the newly optimized acid-sulphate bath solution. The recurring cathode current density combination (RCCC) and the number of layers have been optimized for enhanced performance of the coatings against corrosion. Corrosion behaviour of the nanostructured multilayered coatings was evaluated by Tafel extrapolation and electrochemical impedance spectroscopy (EIS) methods in 3.5% NaCl solution. Under optimal conditions, the CMMA coatings developed were more corrosion-resistant than the monolithic alloy coatings obtained from the same bath. Least corrosion rate (CR) was witnessed at 300 layers, above which saturation of corrosion resistance at a high temperature was found, which is attributed to a shorter relaxation time for redistribution of metal ions during multilayer deposition. Hardness and roughness of the coatings were evaluated using Vickers hardness test and atomic force microscope, respectively. Phase structure of the coatings was discussed using X-ray diffraction technique. The cross-sectional view of the coatings was characterized by scanning electron microscope. CR analysis and the surface morphology of the optimized coatings exposed to high temperature revealed the better performance of CMMA coatings at the elevated temperatures compared to the monolithic coatings.
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Acknowledgements
We thank ISRO-RESPOND (Project No. ISRO/RES/3/723/16-17, dated 03-02-2017), Govt. of India, for sanctioning the project and providing instrumental and financial facilities. We are also grateful to the authorities of Srinivas School of Engineering, Mukka, Mangalore, Karnataka, for providing laboratory facilities and constant support.
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Rashmi, D., Pavithra, G.P., Praveen, B.M. et al. Development of nanocrystalline multilayer Ni–Fe alloy coatings: characterization and its corrosion behaviour at elevated temperature. Bull Mater Sci 43, 131 (2020). https://doi.org/10.1007/s12034-020-02087-6
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DOI: https://doi.org/10.1007/s12034-020-02087-6