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Electroless Ni-B coatings: Preparation and evaluation of hardness and wear resistance
Suresh Krishnamoorthy Seshadri
Published in
2005
Volume: 190
   
Issue: 1
Pages: 115 - 121
Abstract
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. heat-treatment 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. © 2004 Elsevier B.V. All rights reserved.
About the journal
JournalSurface and Coatings Technology
ISSN02578972
Open AccessNo
Concepts (13)
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    Alkalinity
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    Boron
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    Electroless plating
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    Heat treatment
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    Microhardness
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    Structure (composition)
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    Wear resistance
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    X ray diffraction analysis
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    ADHESIVE WEAR MECHANISM
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    ALKALINE BATHS
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    NI-B COATINGS
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    Nickel plating
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    Coating