Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1972-03-28
1977-05-31
Mack, John H.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204DIG8, C25B 1502
Patent
active
040267814
ABSTRACT:
An anodizing system uses both positive and negative current pulses. Such pulses are adjustable to achieve different adjusted values of positive and negative currents. These values are sensed and used to maintain automatically such values. The ratio of negative current to positive current is preferably greater than 3% for the production of relatively thick, dyeable, hard anodized coatings and conventional (normal) anodic coatings of light shades of integral colors using a simple sulfuric acid bath which may be maintained at relatively high temperatures. Current may be applied at nearly full current density initially without burning. In some cases, additional means may be provided to increase the throwing power by eliminating the negative current and using means such as capacitors or inductors to prolong the decay of the positive pulses, preferably such that the then composite positive pulses are maintained above a zero value. These composite positive pulses are maintained in a ratio and wave shape which yields both good throwing power and high quality, even coatings, and produces the anodic coatings at relatively high current densities.
REFERENCES:
patent: 2826538 (1958-03-01), Hunter et al.
patent: 3193485 (1965-07-01), Vincent
patent: 3473103 (1969-10-01), Schaedel;
patent: 3616434 (1971-10-01), Hausner
Hartman John T.
Newman Frederick S.
Thorne John R.
Mack John H.
Mauritz Frank E.
Scionics of California Inc.
Valentine D. R.
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