Tribological Properties and Lubricant Mechanisms of SiO2/MoS2 Hybrid Nanolubricants in Magnesium Alloys Cold Rolling
XIE Hongmei1, JIANG Bin2, PENG Cheng1, PAN Fusheng2
1 College of Mechanical and Electrical Engineering, Yangtze Normal University, Chongqing 408100; 2 College of Materials Scienceand Engineering, National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044
Abstract: Currently, there are no suitable lubricants for the cold rolling process of Mg alloy. Occasional, the lubricants used for Al alloy rolling is used or even skip the lubricants. Cold rolling process without lubricants will lead to poor surface quality of pro-ducts and high energy consumption. The application of conventional oil-based lubricant in Al alloy rolling processes relies heavily on sulphur, chlorine and phosphorous-containing additives. These additives cause negative effects on the environment even at low concentrations during the disposal of waste fluids. Based on this, AZ31 Magnesium alloy sheets were processed by cold rolling lubricated with different SiO2/MoS2 mixing ratios hybrid nanolubricants. The cold rolling performance was investigated by measuring rolling force as well as the surface roughness of the sheets. The morphology and composition of surface were characterized by means of field emission scanning electron microscope (FESEM) and X-ray photoelectron spectrum (XPS), and the synergistic lubrication mechanism of SiO2/MoS2 hybrid nanolubricants was discussed. The results indicated that the optimal SiO2/MoS2 mixing ratio in the base oil was 0.25∶0.75. The excellent lubrication properties of the SiO2/MoS2 hybrid nanolubricant effectively reduced the rolling force and improved the surface quality of sheets during cold rolling process, compared with those of pure nanolubricants and neat oil without nanoparticles tested in the same conditions. The synergistic effect in the SiO2/MoS2 combinations may be explained in terms of the micro-cooperation of various nanoparticles with different shapes and lubrication mechanisms.
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2018, Vol. 32 
