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, SK (2013) Characterization and microhardness of Co-W coatings electrodeposited at different pH using gluconate bath: A comparative study. Surface and Interface Analysis, 45 (6). pp. 1026-1036.

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Official URL: http://dx.doi.org/10.1002/sia.5209

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 XRD, FESEM, DSC and 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 Co0 and W0 along with Co2+ and W6+ species. Again, Co2+ and W6+ are main species in all as-deposited PC plated alloys in both pH. Co0 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 shows higher microhardness compared to their pH8 counterparts.

Item Type: Article
Additional Information: Copyright to this article belongs to M/s. John Wiley & Sons, Inc
Uncontrolled Keywords: Co−W coating;Gluconate bath;pH variation;XPS
Subjects: AERONAUTICS > Aeronautics (General)
CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
ENGINEERING > Structural Mechanics
Depositing User: Users 11 not found.
Date Deposited: 15 May 2014 08:07
Last Modified: 28 Oct 2015 07:20
URI: http://nal-ir.nal.res.in/id/eprint/11962

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