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

Aruna, ST and Roy, Shibayan and Sharma, A and Savitha, G and William Grips, VK (2014) Cost-effective wear and oxidation resistant electrodeposited Ni–pumice coating. Surface and Coatings Technology, 251. pp. 201-209. ISSN 0257-8972

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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 increaseswith 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.

Item Type: Article
Additional Information: Copyright to this article belongs to M/s. Elsevier Publisher
Uncontrolled Keywords: Metal-matrix composite;Electroplated coating;Microhardness; Wear resistance
Subjects: AERONAUTICS > Aeronautics (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 05 Aug 2014 10:14
Last Modified: 02 Jul 2015 07:34

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