Effect of surface defects on anodic oxidation coating of7075 aluminum alloy
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Abstract:
To study the effect of processing on anodization of 7075 high strength aluminum alloy, the aluminum anodic oxidation coating is prepared and the microstructure, surface morphology and the composition are analyzed by metallurgical microscope, stereomicroscope, scanning electron microscopy(SEM) and EDS. The results show that interruptions and cracks of the anodizing film appear in the surface near the precipitates; the anodizing film is thinner around the surface defects and there are cracks in the edge of sharp corners of it. It can improve the quality of the anodic film and meet the requirements of corrosion resistance by increase the surface degree of finish. The anodic oxidation coating is uneven or incomplete, which weakens the protection for the aluminum alloy substrate, due to the surface defect.
