Cost-effective wear and oxidation resistant electrodeposited Ni-pumice coating

Aruna, ST and Roy, Shibayan and Sharma, Amit and Savitha, G and Grips, William VK (2014) Cost-effective wear and oxidation resistant electrodeposited Ni-pumice coating. In: SURFACE & COATINGS TECHNOLOGY, 251 . pp. 201-209.

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Abstract

In the search for newer distributed phases that can be used in Ni-composite coatings, inexpensive and naturally available pumice has been identified as a potential candidate material. The composition of the pumice mineral as determined by Rietveld analysis shows the presence of corundum, quartz, mulllite, moganite and coesite phases. Pumice stone is crushed, ball-milled, dried and dispersed in a nickel sulfamate bath and Ni-pumice coatings are electrodeposited at different current densities and magnetic agitation speeds. Pumice particles are uniformly incorporated in the nickel matrix and Ni-pumice composite coatings with microhardness as high as 540 HK are obtained at the lowest applied current density. In the electrodeposited Ni-pumice coatings, the grain size of Ni increases with the applied current density. The overall intensity of texture development is slightly stronger for the Ni-pumice composite coating compared to plain Ni coating and the texture evolution is possibly not the strongest deciding factor for the enhanced properties of Ni-pumice coatings. The wear and oxidation resistances of Ni-pumice coating are commensurate with that of Ni-SiC coating electrodeposited under similar conditions. (C) 2014 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	SURFACE & COATINGS TECHNOLOGY
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	Copyright for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Keywords:	Metal-matrix composite; Electroplated coating; Microhardness; Wear resistance
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	11 Aug 2014 04:37
Last Modified:	11 Aug 2014 04:37
URI:	http://eprints.iisc.ac.in/id/eprint/49532

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