反復高電流瞬間通電によるアルミニウムの酸性浴陽極酸化

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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)2·2H2O, H2SO4, H3PO4, CrO3 and current density were 4∼55A/dm2 and anodizing time was 30min.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.
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