Method for making a selective absorption film for solar energy

Details Method for making a selective absorption film for solar energy Method for making a selective absorption film for solar energy

1980-12-23

1982-06-29

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 627, C23F 706, C23F 714

Patent

active

043370977

ABSTRACT:
A method for making a selective absorption film for solar energy which comprises immersing aluminum or its alloy in water which contains at least two members selected from phosphate ions, fluoride ions and triethanolamine, and optionally ions of a metal selected from copper, iron, cobalt, silver and a mixture thereof thereby forming a chemical conversion film which shows a great absorptivity and a small emissivity.

REFERENCES:
patent: 2234206 (1941-03-01), Thompson
patent: 3395053 (1968-07-01), Wakelyn
patent: 3819424 (1974-06-01), Russell et al.
patent: 4148670 (1979-04-01), Kelly

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