Abstract
The friction and wear properties of AZ91D magnesium alloy discs sliding against SAE52100 steel balls were evaluated using an Optimol SRV reciprocating friction and wear tester under the lubrication of several ionic liquids. The morphologies of the worn surfaces of the AZ91D magnesium alloy discs were observed using a scanning electron microscope (SEM). In addition, the elemental compositions and chemical states of several typical elements on the worn surfaces of the AZ91D magnesium alloy discs were examined by means of X-ray photoelectron spectroscopy (XPS). The findings indicated that the AZ91D magnesium alloy discs exhibited higher wear resistance, lower and stable friction coefficients as low as 0.03–0.05 when lubricated with ionic liquids. According to the XPS analyses, it was considered that the formation of MgF2 and MgO etc. led to lower friction coefficient and higher wear resistance of AZ91D magnesium alloy specimens lubricated with ionic liquids. The AZ91D magnesium alloy specimens lubricated with ionic liquids, the formation of tribological chemical reaction compounds seemed to lead to lower friction coefficient and higher wear resistance.
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