Novel process for the production of optically selective surfaces

Details Novel process for the production of optically selective surfaces Novel process for the production of optically selective surfaces

1980-09-04

1982-01-05

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

C25D 1134

Patent

active

043092578

ABSTRACT:
The invention relates to a process for the production of optically selective surfaces for use in solar collectors, having a predetermined ratio of absorbance .alpha..sub.s to emmitance .epsilon. of at least 10, which comprises effecting an anodic oxidation of copper, or copper applied to any substrate metal, in an alkaline bath at an elevated temperature between 50.degree. and 85.degree. C., preferably 70.degree. to 85.degree. C., and at a current density of above 1 mA/cm.sup.2 and up to 40 mA/cm.sup.2 until an increase of resistance is experienced. Substrate metals may be copper, copper plated steel, copper plated galvanized iron, copper plated nickel, nickel plated steel to which a layer of copper is applied, and the like.

REFERENCES:
patent: 2315518 (1943-04-01), Gwynn
patent: 3114683 (1963-12-01), Chorney
patent: 3198672 (1965-08-01), De Hart
"Black Anodizing Cu & Brass", by McLean et al., Metal Finishing, Jun. 1945, pp. 247-248.

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