抄録
The effects of electric current and voltage on aluminum integral coloring in oxalic acid and malonic acid solutions were examined. The results obtained were as follows. (1) When a constant current was applied, integral coloring occurred at high voltages, but not at low voltages. The “coloring voltage” was over 80V. (2) In case of aluminum anodizing by using a high constant voltage in dilute solution, the specimen was colored in a short time (60sec.) and no change of the color was observed for a long (10min.) of electrolysis. (3) The current density increased with the rise of bath temperature even though at low voltages; however, the integral coloring of aluminum did not occur, except in the case of the following (4). (4) Aluminum was colored when a peak of current was present on I-t curves at a constant voltage. (5) The surface roughness of aluminum base increased with the increase of applied voltage: that is, the surface roughness was higher at higher applied voltage.
