Sliding wear behavior of electrodeposited Ni–W alloy and hard chrome coatings

Present study deals with the comparative sliding wear behavior of electrodeposited nickel–tungsten (Ni–W) alloy and conventional hard chrome (HCr) coatings. Ni–W alloys with different W (7.4, 10.5 and 11at%) content in Ni were systematically deposited using pulsed electrodeposition from citrate bath...

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Bibliographic Details
Published in:Wear 2015-11, Vol.342-343, p.340-348
Main Authors: Wasekar, Nitin P., Sundararajan, G.
Format: Article
Language:English
Subjects:
Carbides
Cermets
Coatings
Disks
Ductile brittle transition
Electrochemistry
Frictional wear
Grain size
Hard chrome replacement
Hardness
Nickel
Nickel base alloys
Nickel tungsten
Sliding friction
Sliding wear
Wear
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Summary:Present study deals with the comparative sliding wear behavior of electrodeposited nickel–tungsten (Ni–W) alloy and conventional hard chrome (HCr) coatings. Ni–W alloys with different W (7.4, 10.5 and 11at%) content in Ni were systematically deposited using pulsed electrodeposition from citrate bath. In addition, pure Ni coatings were also obtained from Watt׳s bath for comparison purpose. The dry sliding wear behavior of Ni, Ni–W and HCr coatings was compared using pin on disc configuration against WC–Co disc at three different loads. The results indicate that the wear rate is lowest for NiW10.5 amongst all the coatings despite of the fact that HCr coating is 12% harder than NiW10.5 coating. The wear behavior was attributed to ductile wear mechanism in NiW10.5 coatings as opposed to brittle fracture in the case of HCr coatings. •Pulse current electrodeposition of Ni–W alloy coatings.•Improved wear resistance of Ni–W alloy over hard chrome coatings.•NiW10.5 coating is a serious candidate for hard chrome replacement.
ISSN:0043-1648
1873-2577
DOI:10.1016/j.wear.2015.10.003