Tribological performance of ammonium thiomolybdate as water‐soluble lubricant additive for steel‐steel contacts

Abstract The friction and wear reducing properties of ammonium thiomolybdate as a water‐soluble lubricant additive were evaluated using pin‐on‐disck tribometer on steel‐steel contact. tribological performance aqueous solutions prepared at concentrations between 0.1 0.3 wt% Mo the same load (10 N), entrainment speed, sliding distance temperature. Although there is reduction compared with pure water, significant difference observed, depending concentration. SEM/EDAX Raman spectroscopy analyses tracks specimens tested below reveal formation FeS which responsible for gradually coefficient from values 0.30 0.5 down to ~0.11. At Mo, indicated MoS 2 keeps in ~0.05, lowest recorded value.