Research on the Protective Effects of Nano CeO2 on Epoxy Magnesium Aluminum Composite Coatings on Aluminum Alloy
In order to obtain the coatings with better corrosion resistance performance,magnesium powders were replaced by a certain quality of aluminum powders to prepare the epoxy magnesium aluminum composite coatings with adding nano CeO2 on aluminum alloy.The effects of mag-nesium powder,aluminum powder and nano CeO2 on the protective effects of epoxy magnesium aluminum composite coatings on aluminum alloy were studied through Machu test,cross immersion experiment,X-ray diffraction and scanning electron microscope.Then the synergistic protec-tion mechanism of nano CeO2 with magnesium powders and aluminum powders was obtained.The results indicated that the epoxy magnesium alu-minum composite coating had good corrosion resistance when the amount of magnesium powders added was 30wt.%and the amount of aluminum powders added was 20wt.%.In addition,when the optimal filling amount of nano CeO2 in the coating was5wt.%,it could significantly enhance the protective effect of the epoxy magnesium aluminum composite coatings.Furthermore,the magnesium powders and the aluminum powder parti-cles had the large distribution and the large particle size in the composite coatings.A small amount of nano CeO2 particles with the smaller parti-cle size were distributed in spherical shapes in the composite coatings.The composite coatings were very uniform and dense with the good shiel-ding performance.Therefore,the modified composite coatings significantly enhanced the corrosion resistance of aluminum alloys in service envi-ronments.
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