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A Novel Approach to Pulse Anodizing for Decreasing Energy Consumption and Increasing Productivity

Gengan Saravanan, Subramanian Mohan


Anodizing is a resourceful method used to give aesthetic appearance and to prevent a metal from corrosion by forming an oxide layer over its surface. Depending upon the different fields of application various power supply such as direct current (DC) and pulsed current (PC) are used. This paper reviews an existing anodizing method which can be optimized with a few simple guidelines. Several current densities and pulse periods were tested to find the parameters that provide the most optimal productivity and, at the same time, the lowest energy consumption. For long enough, the pulse anodizing has been in the hands of the suppliers of rectifiers. There is not much evidence to state that pulse anodizing with slow pulses is much more effective than with fast pulses. Slow pulses mean low frequency as accounted for in the early eighties by Yokoyama et al. The anodizing industry has rejected this because a lot has been invested in new rectifiers without obtaining energy saving as expected. Additives, increasing acid concentration and temperature have been suggested as new ways to save energy. In this way, the anodizers are in the hand of the chemical suppliers and the quality of the coating is much more insecure.

Keywords: anodizing, pulse periods, current densities, pulse anodizing

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