Method for producing a solar selective coating on aluminum

Details Method for producing a solar selective coating on aluminum Method for producing a solar selective coating on aluminum

1982-08-18

1984-04-03

Douglas, Winston A.

Chemistry: electrical and wave energy

Processes and products

204 35N, 204 42, 126901, C25D 1122

Patent

active

044406061

ABSTRACT:
An improved process for producing a solar selective coating on aluminum comprises a preliminary treatment such as an etch or brightening followed by anodizing in phosphoric acid at a constant voltage of from 10-20 volts for a time period sufficient to provide a total current of from 90-175 coulombs per square decimeter of aluminum surface. Prior to sealing, the resultant anodized surface is subjected to a constant AC voltage coloring treatment in a concentrated metal sulfate solution containing at least 85 grams per liter of metal sulfates.

REFERENCES:
patent: 3382160 (1968-05-01), Asada
patent: 3791940 (1974-02-01), Alexander
patent: 3897287 (1975-07-01), Meyer et al.
patent: 4022671 (1977-05-01), Asada
A. Andersson et al., Nickel Pigmented Anodic Aluminum Oxide . . . , American Institute of Physics, 1979.
W. E. Hubner, The Practical Anodizing of Aluminum, McDonald and Evans, London, 1960, pp. 62-63.
J. D. Edwards, Anodic Coating of Aluminum, Aluminum Company of America, 1939, pp. 14-17.

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