Srinivasan, K.N. and Thangavelu, P.R. (2012) Electroless deposition of composite coatings containing kaolin nanoparticles. Transactions of the Institute of Metal Finishing, 90 (2). pp. 105-112. ISSN 0020-2967

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The ability to codeposit particulate matter in a matrix of electroless nickel has led to a new generation of composite coatings with unique properties, such as high hardness wear, abrasion, corrosion and high temperature oxidation resistance. In this paper, the authors report on the development of electroless Ni–P–kaolin composite coating, and the characteristic properties of the selected deposits were evaluated by scanning electron microscopy, energy dispersive X-ray and X-ray diffraction techniques. A good rate of deposition of 12 mm h21 was observed for the optimised concentration of 6 g L21 of kaolin in the bath. For the optimised bath composition and operating conditions, the composite deposit was found to contain 81?7%Ni, 9?8%P and 10?5%kaolin. Heat treatment at 400uC for 1 h results in an increase in the hardness and wear resistance of the composite coating. The corrosion resistance is also highly enhanced by the incorporation of kaolin in the nickel–phosphorus matrix. The crystallite size of the composite coating is 20 nm, and the codeposition of kaolin follows the Langmuir adsorption isotherm.

Item Type: Article
Uncontrolled Keywords: Electroless deposition; Composite coating; Chemical deposition; Nickel–phosphorus–kaolin; Nanocoating; Heat treatment
Subjects: Electrodeposition
Industrial Metal Finishing
Depositing User: Dr Srinivasan K.N.
Date Deposited: 28 May 2013 13:26
Last Modified: 28 May 2013 13:26

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