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A method of flash anodizing aluminum in acid baths with a momentary high current was investigated, with a view to suppressing increases in bath temperature and reduce electoricitiy consumption by passing a high current at regular intervals in a non electrolytic state. The acid baths used were (COOH) 2 2 H20, H Z SO 4 , H 3 PO 4 , Cr0 3 and current density were 4 ^55A/dm 2 and anodizing time was 30 min. It was found that changes in bath temperature were the same as or less than with the standard method. In phosphoric acid, there was noincrease in coating thickness, but the thickness obtained in the other baths was about double the standard. Hardness of the coating obtained by the two methods were about similer. The effect of this method in controling bath temperature increases and in increasing of coating thickness marked using oxalic acid bath.

A Method of Repetitive Flash Anodizing of Aluminum with Momentry High Current at Electroless State in Acid Bath.