Tribological improvement of magnesium alloy using solid lubricant with cerium oxide catalysis under heating treatment conditions

Purpose This study aims to improve the tribological performance of magnesium alloy materials, a novel regulation method was proposed and investigated in this study. Design/methodology/approach First, magnesium alloy specimens were heat-treated in a muffle furnace with molybdenum disulfide powder as the medium and cerium oxide as the catalyst. Surface morphology, elemental composition and tribological performance were characterized via white light interferometry, X-ray diffractometry and, a reciprocating friction–wear tester. Findings The results reveal that surface roughness of the original sample and pure MoS2 group deteriorates with rising temperature, mainly due to thermal volume expansion. In comparison, the CeO2-catalyzed MoS2 group possesses the lowest surface roughness and outstanding thermal deformation resistance. Meanwhile, CeO2 catalysis induces the in situ formation of MgMoO4 on the alloy surface. Benefiting from Mo element infiltration, this group achieves excellent tribological performance in physiological corrosion solution, especially after heat treatment at 300°C. Originality/value This study provides an innovative process method for tribological performance improving of magnesium alloy materials in physiological corrosion solution.