Electroless Ni–B coatings: preparation and evaluation of hardness and wear resistance

Krishnaveni, K and Sankara Narayanan, T S N and Seshadri, S K (2005) Electroless Ni–B coatings: preparation and evaluation of hardness and wear resistance. Surface and Coatings Technology, 190 (1). pp. 115-121.

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The present work aims to study the hardness and wear resistance of electroless Ni–B coatings. An alkaline bath having nickel chloride as the source of nickel and borohydride as the reducing agent was used to prepare the electroless Ni–B coatings. The structure, microhardness and wear resistance of electroless Ni–B coatings, both in as-plated and heat-treated conditions, were evaluated using X-ray diffraction (XRD), Leitz microhardness tester and a pin-on-disc wear test apparatus. XRD patterns reveal that electroless Ni–B coatings are amorphous in as-plated condition and undergo phase transformation to crystalline nickel and nickel borides upon heat-treatment. The microhardness of the electroless Ni–B coatings increases with increase in heat-treatment temperature and exhibit two maxima in the hardness vs. heattreatment temperature curve. The specific wear rate increases with increase in applied load from 20 to 40 N and at all applied loads, the specific wear rate and coefficient of friction are less for heat-treated electroless Ni–B deposits compared to that obtained for as-plated ones. The wear process of electroless Ni–B coatings is governed by an adhesive wear mechanism.

Item Type:Article
Official URL/DOI:http://dx.doi.org/10.1016/j.surfcoat.2004.01.038
Uncontrolled Keywords:Electroless Ni–B coating; Microhardness; Wear resistance
Divisions:NML Chennai > Chemistry
ID Code:312
Deposited By:Dr. TSN Sankara Narayanan
Deposited On:24 Nov 2009 09:10
Last Modified:03 Jan 2012 12:27
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