Chemistry: electrical and wave energy – Processes and products
Patent
1977-09-12
1979-05-01
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204 28, 204 33, 204 58, C25D 1108, C25D 1110, C25D 1116
Patent
active
041522214
ABSTRACT:
Anodizing apparatus and method suitable for anodizing an aluminum part by a continuous process wherein the part is moved through adjacent processing regions to sequentially clean, anodize, rinse, reanodize, rerinse and dry same. The anodizing regions form anodizing cells wherein an unbroken anodizing current conducting envelope of electrolyte is formed around the part. In order to produce a hard anodized aluminum product, the electrolyte may be refrigerated or contain a selective additive. The selective additive may be formed of hydroxyacetic, carboxylic or hydroxydicarboxylic acids combined with an alcohol or triethanolamine. A surfactant may also be included in the electrolyte to form an oxygen holding foam around the part portion being anodized. Circuitry is provided to supply voltage pulses of the same polarity across the electrodes of the two anodizing cells on a time sharing basis and the voltage pulses are selectively controlled to set the average anodizing current density in each of the cells at a selected predetermined RMS value. The sprayed electrolyte is collected, recirculated and refrigerated, and reused in the apparatus.
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Surface Treatment of Al, by Wernick et al., 3rd Ed., 1964, p. 316.
Andrews R. L.
Fournie Thomas A.
Kaye Nancy Lee
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