Effect of titania particles preparation on the properties of Ni–TiO2 electrodeposited composite coatings

Aruna, ST and Muniprakash, M and William Grips, VK (2013) Effect of titania particles preparation on the properties of Ni–TiO2 electrodeposited composite coatings. Journal of Applied Electrochemistry, 43 (8). pp. 805-815. ISSN 0021-891X

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Abstract

In this paper, the effect of titania particles preparation on the properties of Ni–TiO2 electrocomposite coatings has been addressed. Titania particles were prepared by precipitation method using titanium tetrachloride as the precursor. The titanyl hydroxide precipitate was subjected to two different calcinations temperatures (400 and 900 �C) to obtain anatase and rutile titania particles. These particles along with commercial anatase titania particles were separately dispersed in nickel sulfamate bath and electrodeposited under identical electroplating conditions to obtain composite coatings. The electrodeposited coatings were evaluated for their microhardness, wettability, corrosion resistance, and tribological behavior. The variation of microhardness with current density exhibited a similar trend for all the three composite coatings. The composite coating containing anatase titania particles exhibited higher microhardness and improved wear resistance. However, the corrosion resistance of the composite coating containing commercial titania powder was superior to that of plain nickel, Ni–TiO2 composite coatings containing anatase and rutile titania particles. The poor corrosion resistance of these composite coatings was attributed to the higher surface roughness of the coatings. This problem was alleviated by incorporating ball-milled titania powders. The composite coatings with higher surface roughness were modified with a low surface energy material like fluoroalkyl silane to impart hydrophobic and superhydrophobic properties to the coatings. Among these coatings, Ni–TiO2–9C coating exhibited the highest water contact angle of 157�.

Item Type:	Article
Additional Information:	Copyright to this article belongs to M/s. Springer
Uncontrolled Keywords:	Precipitation;Electrodeposition;Corrosion test;Hardness;Wear
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General) ENGINEERING > Electronics and Electrical Engineering ENGINEERING > Structural Mechanics
Depositing User:	Ms. Alphones Mary
Date Deposited:	16 Sep 2013 04:32
Last Modified:	16 Sep 2013 04:32
URI:	http://nal-ir.nal.res.in/id/eprint/11774

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