Figure 9: Curve-fitted XPS spectra of typical elements (C1s, O1s, Fe2p, Cr2p, Ag3d) on the wear surface lubricated by 10w40+0.1 wt.% Sc-Ag/GN nano-oil after sliding for different times (343 N, 1200 rpm, 75 ± 1 °C).
(a–e) 5 mins, (f–j) 40 mins, (k–o) 60 mins.
