Seenivasan, H and Bera, Parthasarathi and Rajam, KS and Parida, Sanjit Kumar (2013) CHARACTERIZATION AND HARDNESS OF Co-P COATINGS OBTAINED FROM DIRECT CURRENT ELECTRODEPOSITION USING GLUCONATE BATH. In: SURFACE REVIEW AND LETTERS, 20 (5).
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Direct current electrodeposition of Co-P alloy coatings were carried out using gluconate bath and they were characterized by employing techniques like XRD, FESEM, DSC and XPS. Broad XRD lines demonstrate the amorphous nature of Co-P coatings. Spherical and rough nodules are observed on the surface of coatings as seen from FESEM images. Three exothermic peaks around 290, 342 and 390 degrees C in DSC profiles of Co-P coatings could be attributed to the crystallization and formation of Co2P phase in the coatings. As-deposited coatings consist of Co metal and oxidized Co species as revealed by XPS studies. Bulk alloy P (P delta-) as well as oxidized P (P5+) are present on the surface of coatings. Concentrations of Co metal and P delta- increase with successive sputtering of the coating. Observed microhardness value is 1005 HK when Co-P coating obtained from 10 g L-1 NaH2PO2 is heated at 400 degrees C that is comparable with hard chromium coatings.
| Item Type: | Journal Article |
|---|---|
| Publication: | SURFACE REVIEW AND LETTERS |
| Publisher: | WORLD SCIENTIFIC PUBL CO PTE LTD |
| Additional Information: | copyright for this article belongs to WORLD SCIENTIFIC PUBL CO PTE LTD,SINGAPORE |
| Keywords: | Alloy coating; Co-P; electrodeposition; DSC; XPS; microhardness |
| Department/Centre: | Division of Chemical Sciences > Solid State & Structural Chemistry Unit |
| Date Deposited: | 28 Dec 2013 06:16 |
| Last Modified: | 28 Dec 2013 06:16 |
| URI: | http://eprints.iisc.ac.in/id/eprint/47986 |
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