Friction of Thin Electroless NiP and NiP-SiO₂ Coatings on Aluminium Alloy Substrate

Abstract:

Thin NiP and NiP+SiO₂ coatings were deposited by electroless techniques on aluminum alloy plates. Dry sliding tests against Al₂O₃ counterbody with the ball on plate contact geometry and reciprocal moving were carried out. The results of tribological tests showed that the friction coefficient of the modified coating at loads above 500 mN by 3-4 times, and wear 1.4-2 times lower than for original NiP coatings. It was found that during friction of NiP and NiP+SiO₂ coatings different tribochemical processes are realized. These processes lead to the formation of different by chemical composition of P, Ni and O of secondary structures on the friction surfaces and as result to different tribological properties of the investigated coatings.

• Periodical: Key Engineering Materials (Volume 527)
• Pages: 92-97
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.527.92
• Online since: November 2012
• Authors: Nikolai K. Myshkin, Andrei Ya. Grigoriev, Dzmitry M. Gutsev
• Keywords: Aluminum Alloy Substrate, Electroless Plating (EP), NiP/SiO₂ Composite Coatings, Tribochemical Interaction, Unlubricated Friction, Wear

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