METHOD FOR ANODICALLY OXIDIZING ALUMINUM ALLOY AND POWER SUPPLY FOR ANODICALLY OXIDIZING ALUMINUM ALLOY
摘要
<p>A method for anodically oxidizing an aluminum alloy is provided for forming an anodically oxidized film on the surface of the aluminum alloy by using pulse power. An anodically oxidizing anode and an anodically oxidizing cathode are short-circuited for a short-circuiting time of 15µs or shorter when a pulse voltage is not applied after a positive pulse voltage is applied. Furthermore, the cycle of waveform of the pulse power has a pulse voltage application time (T<SUB>+</SUB>), a dead time (T<SUB>d</SUB>) and a short-circuiting time (T<SUB>s</SUB>) in this order. Thus, a film forming speed and productivity are improved by suppressing a negative current or by preventing the negative current from flowing.</p>
