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In this research, the tribological behaviour of oil‐based SnO2 nanofluid was evaluated using flat‐on‐flat reciprocating sliding tests on brass. Oleic acid was used as surfactant to improve the stability of SnO2 nanofluid. The morphology of the worn surfaces was observed using optical microscopy, scanning electron microscopy, and energy‐dispersive X‐ray spectroscopy. It was found that oil‐based SnO2 nanofluid reduced the coefficient of friction up to 65.4% and the wear volume loss up to 43.7%. In the analysis of the chemical composition inside the wear track, a tribosintered or embedded patchy film containing tin was observed, which protected the surface against wear and lowered the coefficient of friction. The SnO2 nanoparticles might also roll or slide between 2 mating surfaces to prevent adhesive wear.

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In this research, friction and wear characteristics of oil-based ZnO nanofluid applied on brass disk specimens using a flat-on-flat reciprocating sliding test were studied. Oleic acid was used as surfactant to improve the stability and dispersibility of the ZnO nanofluid. Metallurgical optical microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy were utilized to understand the mechanisms. A 2wt% ZnO nanofluid resulted in 61.1% reduction in coefficient of friction. Good wear resistance was achieved using low concentrations of 0.5wt% and 1wt% ZnO nanofluid. A tribo-film mainly composed of carbon was found inside the wear track, which enhanced the wear resistance and lowered the interface shear strength. This tribo-film was produced by oleic acid which was chemically adsorbed to the brass materials.