Solar absorber surfaces

Details Solar absorber surfaces Solar absorber surfaces

1976-07-14

1978-05-02

Hoffman, James R.

Metal treatment

Compositions

Heat treating

126270, 148 614R, 148 631, 148 315, 427160, F24J 302, B05D 310, B05D 118

Patent

active

040872882

ABSTRACT:
A method for improving the selectivity of a black copper oxide absorber surface which comprises treating the surface with a solution containing chromate ions and ammonium ions. Copper black surfaces when so treated and solar absorbers with such surfaces are included.

REFERENCES:
patent: 2460896 (1949-02-01), Meyer
patent: 2481854 (1949-09-01), MacMahon
patent: 3198672 (1965-08-01), De Hart

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