Lubrication Effect of Polyethylene Glycol/Polyvinyl Alcohol Composite Lubrication Film on Micro-arc Oxidation Ceramic Layer of Aluminum Alloy Surface
Micro-arc oxidation(MAO)technology can obviously improve the mechanical properties and surface proper-ties of aluminum alloy.However,the ceramic layer obtained by MAO shows high roughness,which leads to great wear of aluminum alloy during friction.To improve the wear resistance of aluminum alloys,a composite film with excellent lubrica-tion performance was prepared on the ceramic layer surface of aluminum alloy after MAO using hot pressed polyvinyl alco-hol(PVA)and polyethylene glycol(PEG)polymers.The lubrication performance of the composite film was characterized under different frequencies,loads and lubrication conditions.X-ray diffraction(XRD)and Fourier transform infrared(FT-IR)were used to analyze the formation mode and lubrication mechanism of the composite film.The results show that the composite film has good lubrication performance,and its friction coefficient is only 1/4 of that without the film.The compos-ite film maintains good lubrication characteristics under dry friction,oil lubrication,and high-speed working conditions,but it will undergo local dissolution in water environment,resulting in poor lubrication performance.The network structure of the composite film and the self-lubricating characteristics of the polymer play an excellent lubricating role together.
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