Abstract
A laser beam micro surface finishing method attempted to remove hard anodic oxide film formed on aluminum specimens. The hardness of the film increases with increasing applied current density during anodizing and decreasing concentration of SO42− ions. Specimens were irradiated in solutions with a pulsed Nd-YAG laser beam through a convex lens with 60mm focal length to remove anodic oxide film locally. Thin anodic oxide film can be removed without cracks by one pulse of laser irradiation, but thick oxide films need several pulses of irradiation removed without cracks. Thick as grown hard anodic oxide film was removed leaving numerous cracks and the size of the removed area increased with irradiation time. However, dyed thick anodic oxide film was removed layerwise at low irradiation power without cracks, because the dyed oxide film absorbed laser energy. The size of removed area of the dyed film did not change with irradiation time.
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