Chemistry: electrical and wave energy – Processes and products
Patent
1986-12-19
1989-11-07
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204 585, 204228, C25D 1100, C25D 2100
Patent
active
048790184
ABSTRACT:
A low voltage anodizing process for anodic oxidation of metals in which are used: (i) an anodizing bath containing an electrolyte, an anode and a cathode; and (ii) and AC fed DC power supply for supplying pulsating DC power to the anodizing bath; the anodizing process comprising cyclicly discharging the inherent capacitance in the anodizing bath; such cyclic discharge of such inherent capacitance being accomplished by providing successive power cycles wherein each such power cycle consists of a rise portion followed by a fall portion followed by an off-time portion; and providing a shunt discharge path in electrical circuit across the anode and cathode and being external to the anodizing bath for discharging such inherent capacitance during the last part of such fall portion and all during such off-time portion of each power cycle, a significant fraction of the total anodizing current being shunted across such discharge path which is large enough to completely discharge such inherent capacitance and to empty it of accumulated charges thereon prior to the rise portion of the next subsequent power cycle, there being no capacitor in electrical circuit across the anode and cathode and external to the anodizing bath.
REFERENCES:
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Fenoglio Charles
Kljucaricek Peter
Pernick Jeffrey
Schaedel Fred C.
Fisher William L.
Gorgos Kathryn
Niebling John F.
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