XPS Characterization and Microhardness of Heat Treated Co–W Coatings Electrodeposited with Gluconate Bath
Thermal stability and effect of heat treatment on electronic structure and microhardness of electrodeposited Co–W alloy coatings using gluconate bath was characterized by DSC and XPS. XPS studies demonstrate that as-deposited alloy coating has significant amount of Co and W metals as well as Co2+ and W6+ species. There is a decrease in Co metal concentration in the alloy heated at 600 °C and Co is in fully oxidized form when it is heat treated at 800 °C. Marginal decrease in W metal concentration and presence of both W6+ and W5+ species are observed when the coating is heated at 600 °C, whereas mostly W6+ species along with a little amount of W5+ could be seen in the coating heated at 800 °C. Microhardness values of 1017 and 1336 HK are observed when Co–W coatings are heated at 500 and 600 °C, respectively and they are comparable with as-deposited hard chromium coatings.
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Document Type: Research Article
Publication date: September 1, 2013
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