Abstract
Passivation behaviour of nanocrystalline coating (Fe80Si20) obtained by in situ mechanical alloying route is studied and compared with that of the commercial pure iron and cast Fe80Si20 in sodium borate buffer solution at two different pH values (7·7 and 8·4). The coating reveals single passivation at a pH of 7·7 and double stage passivity at a pH of 8·4. The first passive layer is due to the dissolution mechanism and second passivity is related to stable passivation. The cast sample shows single stage passivity in the solution of pH 8·4. The difference in the passivation behaviour for the cast alloy (Fe80Si20) and the coating is related to the presence of highly iron-enriched localized regions, formed during the processing stage of coating.
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Acknowledgements
This work has been supported by the Department of Science and Technology, India based on a SERC Engineering Sciences project “Bulk Metallic Glass Coating”.
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GUPTA, G., MOON, A.P. & MONDAL, K. Electrochemical passivation behaviour of nanocrystalline Fe80Si20 coating in borate buffer solution. Bull Mater Sci 36, 51–58 (2013). https://doi.org/10.1007/s12034-013-0437-4
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DOI: https://doi.org/10.1007/s12034-013-0437-4