The Effect of Different Anodizing Voltages on the Surface Properties of 2A12 Aluminum Alloy
The effects of different anodic oxidation voltages on micromorphology,composition,porosity,microhardness and corrosion resistance of anodic oxide film were studied by using 2 A12 aluminum alloy as the matrix.The results show that the oxide films generated under different anodic oxidation voltages are porous.At 20 V,the surface porosity of the sample is the largest(4.394%)and the oxygen content the highest(35.76%).The surface roughness is the largest(34.9)at 30 V.With the increase of anodic oxidation voltage,the corrosion resistance of the sample surface shows a trend of increasing first and then decreasing,and the corrosion resistance is strongest at 20 V.After the optimal anodized aluminum alloy matrix is coated with epoxy coating,the mechanical properties and corrosion resistance of the aluminum alloy matrix are analyzed,and the results show that the anodizing process can greatly improve the adhesion and corrosion resistance of the coating sample.
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