Characterization and microhardness of Co-W coatings electrodeposited at different pH using gluconate bath: a comparative study

Bera, Parthasarathi and Seenivasan, H and Rajam, KS and Shivakumara, C and Parida, Sanjit Kumar (2013) Characterization and microhardness of Co-W coatings electrodeposited at different pH using gluconate bath: a comparative study. In: Surface and Interface Analysis, 45 (6). pp. 1026-1036.

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Abstract

Electrodeposition of Co-W alloy coatings has been carried out with DC and PC using gluconate bath at different pH. These coatings are characterized for their structure, morphology and chemical composition by X-ray diffraction, field emission scanning electron microscopy, differential scanning calorimetry and X-ray photoelectron spectroscopy (XPS). Alloy coatings plated at pH8 are crystalline, whereas coatings electrodeposited at pH5 are nanocrystalline in nature. XPS studies have demonstrated that as-deposited alloy plated at pH8 with DC contain only Co2+ and W6+ species, whereas that alloy plated at pH5 has significant amount of Co-0 and W-0 along with Co2+ and W6+ species. Again, Co2+ and W6+ are main species in all as-deposited PC plated alloys in both pH. Co-0 concentration increases upon successive sputtering of all alloy coatings. In contrast, mainly W6+ species is detected in the following layers of all alloys plated with PC. Alloys plated at pH5 show higher microhardness compared to their pH8 counterparts.

Item Type:	Journal Article
Publication:	Surface and Interface Analysis
Publisher:	Wiley-Blackwell
Additional Information:	Copyright of this article belongs to Wiley-Blackwell.
Keywords:	Co-W Coating; Gluconate Bath; pH Variation; XPS
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	26 Jun 2013 12:32
Last Modified:	08 Jul 2013 07:22
URI:	http://eprints.iisc.ac.in/id/eprint/46751

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