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Surface Energy and Tribology of Electrodeposited Ni and Ni–Graphene Coatings on Steel

1
Department of Mechanical Engineering, University of Nevada, Reno, Reno, NV 89557, USA
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Department of Chemical and Materials Engineering, University of Nevada, Reno, Reno, NV 89557, USA
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Author to whom correspondence should be addressed.
Lubricants 2019, 7(10), 87; https://doi.org/10.3390/lubricants7100087
Received: 3 August 2019 / Revised: 27 September 2019 / Accepted: 4 October 2019 / Published: 9 October 2019
(This article belongs to the Special Issue Wear and Corrosion Resistant Coatings)
Composite electrochemical coatings (CECs) are some of the most widely investigated coatings due to its versatility in tailoring physio-mechanical and tribological properties. The effectiveness of the CECs for tribological applications is dependent on the solid–liquid interfaces. The active and passive nature of the contact boundaries for a CEC with a solid/liquid interface is defined by the surface energy of these boundaries. Unless the effect of surface energy on the tribological properties of the CEC are understood, it is not possible to get a holistic picture on properties, such as corrosion and tribocorrosion. The present study investigates the surface energy of optimized nickel (Ni) and Ni–graphene (Ni–Gr) coatings and their effect on the dynamic friction and wear behavior. It was found that the addition of Gr to the Ni coating in small quantities could decrease the polar component of surface energy significantly than the dispersive component. The presence of Gr in the coating was able to reduce the wear while providing low friction. The Ni–Gr coating exhibited low surface energy that includes weak adhesive forces, which can prevent embedding of the wear particles during sliding. View Full-Text
Keywords: surface energy; contact angle; friction; wear; graphene; electrodeposition surface energy; contact angle; friction; wear; graphene; electrodeposition
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MDPI and ACS Style

Siddaiah, A.; Kumar, P.; Henderson, A.; Misra, M.; Menezes, P.L. Surface Energy and Tribology of Electrodeposited Ni and Ni–Graphene Coatings on Steel. Lubricants 2019, 7, 87.

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