Abstract
Anodized oxide coating obtained from phosphoric acid bath at the voltage lower than that employed in the usual method was successfully colored by varying the a. c. electrolytic duration in nickel sulfate bath alone. Addition of boric acid and well known complex, such as ammonium compounds, amines, and aqueous ammonia, was very effective for multicoloring. Boric acid was particularly the best additive. These additives seem to promote the deposition of nickel in the pores. Addition of tartaric acid, sulfulic acid, and aluminium sulfate delayed multi-coloring and resulted in single-coloring. These additives seem to restrain growth of the deposits in the pore of the coating. Color of the coatings can be controlled by varing the electrolytic duration, and kind and amount of the additives.
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