CHARACTERIZATION AND MICROHARDNESS OF ELECTRODEPOSITEDNi–WCOATINGS OBTAINED FROM GLUCONATE BATH

Parthasarathi Bera (), M. Dinesh Kumar, Chinnasamy Anandan and C. Shivakumara
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Parthasarathi Bera: Surface Engineering Division, CSIR–National Aerospace Laboratories, Bangalore 560017, India
M. Dinesh Kumar: Surface Engineering Division, CSIR–National Aerospace Laboratories, Bangalore 560017, India
Chinnasamy Anandan: Surface Engineering Division, CSIR–National Aerospace Laboratories, Bangalore 560017, India
C. Shivakumara: Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India

Surface Review and Letters (SRL), 2015, vol. 22, issue 01, 1-15

Abstract: Ni–Walloy coatings are electrodeposited with direct and pulse current using gluconate bath at pH5. Effects of direct current (DC) and pulse current (PC) on structural characteristics of the coatings have been investigated by energy dispersive X-ray spectroscopy (EDXS), X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), differential scanning calorimetry (DSC) and X-ray photoelectron spectroscopy (XPS). EDXS shows thatWcontents are 13.3 and 12.6 at.% in DC and PC (10:40)Ni–Wcoatings, respectively. FESEM analysis exhibits the homogeneous coarse nodular morphology in DC plated deposits. DSC studies reveal thatNi–Wcoatings are thermally stable up to 400°C. XPS studies demonstrate that DC plated coating has significant amount ofNiandWin elemental form along with their respective oxidized species. In contrast, mainly oxidized metals are present in the as-deposited coatings prepared with PC plating. The microhardness of pulse current (100:400) depositedNi–Wcoating is about 750 HK that is much higher than DC plated coating (635 HK). Heat treatment of the deposits carried out at different temperatures show a significant increase in microhardness which can be comparable with hard chromium coatings.

Keywords: Ni–Wcoating; electrodeposition; gluconate bath; XPS; microhardness (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1142/S0218625X15500110

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