Hu, Q.; Li, X.; Zhao, G.; Ruan, Y.; Wang, G.; Ding, Q. Effects of Graphene Oxide on Tribological Properties of Micro-Arc Oxidation Coatings on Ti-6Al-4V. Coatings2023, 13, 1967.
Hu, Q.; Li, X.; Zhao, G.; Ruan, Y.; Wang, G.; Ding, Q. Effects of Graphene Oxide on Tribological Properties of Micro-Arc Oxidation Coatings on Ti-6Al-4V. Coatings 2023, 13, 1967.
Hu, Q.; Li, X.; Zhao, G.; Ruan, Y.; Wang, G.; Ding, Q. Effects of Graphene Oxide on Tribological Properties of Micro-Arc Oxidation Coatings on Ti-6Al-4V. Coatings2023, 13, 1967.
Hu, Q.; Li, X.; Zhao, G.; Ruan, Y.; Wang, G.; Ding, Q. Effects of Graphene Oxide on Tribological Properties of Micro-Arc Oxidation Coatings on Ti-6Al-4V. Coatings 2023, 13, 1967.
Abstract
Micro-arc oxidation (MAO) is an emerging technology employed to produce high hardness or anti-corrosion ceramic coatings on lightweight metals such Al, Ti, Mg and their respective alloys. However, under non-lubrication conditions, such coatings exhibit relatively high friction coeffi-cients. To enhance the friction reduction properties of the MAO coatings, we employed a one-step MAO process with varying concentrations of graphene oxide (GO) in an aluminate sys-tem electrolyte to create composite coatings on the surfaces of Ti-6Al-4V alloy. The effect of concentrations of GO particles on microstructure, composition, and wear behavior of the result-ing composite coatings was investigated. Measurements of the coating's thickness, hardness, and roughness have also been conducted. Ball-on-disk friction test under dry condition were carried out to reveal tribological behavior of the MAO coating. The addition of graphene oxide in the electrolyte reduces the friction coefficient, with the composite coating containing 5 g/L of GO particles displaying the most effective friction reduction. Moreover, coating thickness increases with higher GO concentration. This friction reduction can be attributed to the particles in the coating acting as lubricants during friction, while GO also reduces adhesive damage, shifting the wear mechanism from adhesive to abrasive.
Keywords
Micro-arc oxidation; Ti-6Al-4V titanium alloy; graphene oxide; friction and wear
Subject
Engineering, Mechanical Engineering
Copyright:
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