Effect of Ce(NO3)3 Doping on the Microstructure and Wear Resistance of Al-Zn-Mg-Y Alloy PEO Coating
In view of the poor wear resistance of aluminum alloy used in aviation,plasma electrolytic oxidation(PEO)technology was used to form ceramic coating on the surface of Al-Zn-Mg-Y alloy,and the effect of Ce(NO3)3 doping amount in electrolyte on the performance of aluminum alloy PEO coating was studied.XRD,SEM,metallographic microscope,confocal microscope and friction and wear tester were used to characterize the phase composition,metallographic structure,surface morphology,microhardness,friction coefficient and other parameters of PEO coating of aluminum alloy.The results show that the PEO coating on the surface of Al-Zn-Mg-Y alloy is mainly composed of α-Al2O3 and γ-Al2O3.With the increase of Ce(NO3)3 doping,the diffraction peak of Al2O3 phase is strengthened,the proportion content of Al2O3 phase increases.The PEO coating obtained by doping Ce(NO3)3 is uniform.The surface of the PEO coating prepared in the basic electrolyte has a"crater"shaped discharge microporous channel.With the increase of Ce(NO3)3 doping,the size of discharge microporous channels in the coating decreases.When the doping amount of Ce(NO3)3 is too high,corrosion pits and a small amount of mi-crocracks appear on the coating surface.With the increase of Ce(NO3)3 doping amount,the microhardness of PEO coating shows a trend of first increase and then decrease.The maximum value appears when Ce(NO3)3 doping amount is 3.9％o,a-bout 335.8 HV1.Proper doping of Ce(NO3)3 can improve the density of the coating,but the friction coefficient and surface roughness of the PEO coating increases when the doping amount of Ce(NO3)3 is too high.
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