STUDIES ON SURFACE STRUCTURE, MORPHOLOGY AND COMPOSITION OFCo–WCOATINGS ELECTRODEPOSITED WITH DIRECT AND PULSE CURRENT USING GLUCONATE BATH

Parthasarathi Bera (), H. Seenivasan and K. S. Rajam
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Parthasarathi Bera: Surface Engineering Division, CSIR–National Aerospace Laboratories, Bangalore 560017, India
H. Seenivasan: Surface Engineering Division, CSIR–National Aerospace Laboratories, Bangalore 560017, India
K. S. Rajam: Surface Engineering Division, CSIR–National Aerospace Laboratories, Bangalore 560017, India

Surface Review and Letters (SRL), 2013, vol. 20, issue 01, 1-16

Abstract: Co–Walloy coatings were deposited with direct current (DC) and pulse current (PC) electrodeposition methods using gluconate bath at pH5 and characterized by X-ray diffraction, field emission scanning electron microscopy, atomic force microscopy, differential scanning calorimetry (DSC) and X-ray photoelectron spectroscopy (XPS). DSC studies hint at the possibility of formation of metallic glasses. Detailed XPS studies of these alloy coatings have been carried out to compare elemental states and composition ofCoandWin DC and PC electrodeposited alloys. DC-plated alloy has significant amount ofCoandWmetal along with their respective oxidized species. In contrast, mainly oxidized metals are present in the following layers of as-deposited coatings prepared with PC plating. Concentration ofCometal is observed to increase during sputtering, whereas there is no change inW6+concentration. Microhardness measurement of all theCo–Wcoatings shows higher hardness compared toCometal and 1:1 and 1:4 PC electrodeposited coatings show little higher hardness compared to 1:2 PC electrodeposited coating.

Keywords: Co–Wcoating; electrodeposition; gluconate bath; XPS (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1142/S0218625X13500066

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