Seenivasan, H and Bera, Parthasarathi (2017) Effect of P codeposition on the structure and microhardness of Co-W coatings electrodeposited from gluconate bath. In: SURFACE AND INTERFACE ANALYSIS, 49 (6). pp. 554-569.
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Effects of addition of P to Co-W coatings from gluconate bath using direct current (DC) and pulse current (PC) methods have been investigated in this study. Co-W-P coatings with different P concentrations are prepared by varying hypophosphite concentration in the bath. Current efficiency of the Co-W-P electrodeposition is lower than that for Co-W coatings. Increase in NaH2PO2 concentration increases the cobalt content significantly and decreases the tungsten content drastically. Co-W-P coatings display `cauliflower-like' morphology and roughness of the coatings increases with increasing P content. As-deposited Co-W-P deposits are amorphous while heat treatment at different temperatures has rendered them crystalline with the precipitation of stable species like, Co3W, Co2P, etc. Unlike Co-Wcoatings, Co-W-P shows two-step crystallization in differential scanning calorimetry (DSC) and on heat treatment, which is similar to the behavior of Co-P electrodeposited from gluconate baths. Moreover, inclusion of phosphorous and heat treatment have led to significant increase in microhardness of the Co-W-P coatings. X-ray photoelectron spectroscopy (XPS) studies provide a detailed insight into the nature of Co, W and P species in as-deposited and sputtered coatings. Microhardness of the heat-treated coatings is higher than the as-deposited counterparts and is comparable with that of hard chromium. Copyright (C) 2016 John Wiley & Sons, Ltd.
| Item Type: | Journal Article |
|---|---|
| Publication: | SURFACE AND INTERFACE ANALYSIS |
| Additional Information: | Copy right for this article belongs to the WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ USA |
| Department/Centre: | Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering) |
| Date Deposited: | 10 Jun 2017 04:37 |
| Last Modified: | 17 Oct 2018 07:29 |
| URI: | http://eprints.iisc.ac.in/id/eprint/57143 |
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