| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for processing an anodic oxidation film different in thickness in a front and back, with which a thick film is formed on one side and a thin film on the other side and the thickness of the film can be appropriately set easily to obtain a desired product, and the cost is reduced. SOLUTION: A pair of cathode plates 3 and 4 are placed in an electrolytic cell 1 filled with an electrolyte 2 at a specified distance H from each other, a pair of aluminum or aluminum alloy plates 5 and 6 are interposed between the cathode plates 3 and 4. The aluminum or aluminum alloy plates 5 and 6 are connected to an anode and hence the film becomes thinner on the face opposite to the plates 5 and 6.
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