CHARACTERIZATION AND HARDNESS OFCo–PCOATINGS OBTAINED FROM DIRECT CURRENT ELECTRODEPOSITION USING GLUCONATE BATH

H. Seenivasan, Parthasarathi Bera (), K. S. Rajam and Sanjit Kumar Parida
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H. Seenivasan: Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560017, India
Parthasarathi Bera: Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560017, India
K. S. Rajam: Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore 560017, India
Sanjit Kumar Parida: Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India

Surface Review and Letters (SRL), 2013, vol. 20, issue 05, 1-12

Abstract: Direct current electrodeposition ofCo–Palloy 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 ofCo–Pcoatings. Spherical and rough nodules are observed on the surface of coatings as seen from FESEM images. Three exothermic peaks around 290, 342 and 390°C in DSC profiles ofCo–Pcoatings could be attributed to the crystallization and formation ofCo2Pphase in the coatings. As-deposited coatings consist ofCometal and oxidizedCospecies as revealed by XPS studies. Bulk alloyP(Pδ-)as well as oxidizedP(P5+)are present on the surface of coatings. Concentrations ofCometal andPδ-increase with successive sputtering of the coating. Observed microhardness value is 1005 HK whenCo–Pcoating obtained from 10 g L-1NaH2PO2is heated at 400°C that is comparable with hard chromium coatings.

Keywords: Alloy coating; Co–P; electrodeposition; DSC; XPS; microhardness (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1142/S0218625X13500492

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