Method of producing light absorptive surface on aluminum zinc al

Details Method of producing light absorptive surface on aluminum zinc al Method of producing light absorptive surface on aluminum zinc al

1982-05-12

1984-10-30

Lewis, Michael L.

Metal treatment

Compositions

Heat treating

148 627, 148 315, 428653, 428659, C23F 502

Patent

active

044798326

ABSTRACT:
This invention is directed to a method for producing a corrosion-resistant, composite product, such as sheet and strip, having a thin, uniformly black, light-absorptive surface layer thereon, and to the product of such method. The method includes the steps of treating a product having a coating containing both zinc and aluminum, such as galvanized strip, or up to 70% by weight, aluminum, balance essentially zinc coated strip, with an aqueous alkaline solution for a sufficient time to form a zinc-rich surface on said product, which surface is reactive with a blackening bath containing Ni and Sb, and subjecting such treated product to such blackening bath to form said thin, uniform, light-absorptive surface layer on said product. The light-absorptive surface layer has a thickness of at least 80 nm, preferably between about 100-400 nm, and an absorptance greater than about 95% over the solar radiation spectrum.

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Gogna, P. K., et al., "Selective Black Nickel Coatings on Zinc Surfaces by Chemical Conversion", Solar Energy, vol. 23, pp. 405-407 (1979).
Branciavoli, J. P., et al., "Black Chrome Plating: Application and Deposit Characteristics of a New Plating Process", Plating, pp. 37-43; (1969).

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