Method for producing solar collector plates

Details Method for producing solar collector plates Method for producing solar collector plates

1978-04-24

1981-03-10

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

427160, 126417, 126446, 126901, 428629, C23F 704, F24J 302

Patent

active

042552133

ABSTRACT:
A solar collector plate made of stainless steel or a metal having a nickel-flash coating is immersed in a molten dichromate salt bath at a temperature between about 375.degree. C. and about 500.degree. C. sufficiently long to provide a selective oxide coating which has a Figure of Merit of at least about 4. The oxide coating is continuous, has a microscopically nodular texture with the average nodule size being at least about 5000 A and displays a Figure of Merit of at least about 4.

REFERENCES:
patent: 1937629 (1933-12-01), Carveth
patent: 2537035 (1951-01-01), Clingan
patent: 2542994 (1951-02-01), Cobb
patent: 2618578 (1952-11-01), Kreml
patent: 3963530 (1976-06-01), Smollett et al.
patent: 4097311 (1978-06-01), Ishibashi et al.
patent: 4133914 (1979-01-01), Zani
patent: 4177325 (1979-12-01), Roberts et al.

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