Patent
Method of producing light absorptive surface on aluminum zinc alloy coated product
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TLDR
In this article, 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.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.read more
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References
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Panel for selectively absorbing solar thermal energy and the method of producing said panel
TL;DR: In this paper, a panel for selectively absorbing solar thermal energy comprising a metallic substrate, a layer of bright metallic material carried on the substrate, and a solar-thermal energy absorbing coating was presented.
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Journal ArticleDOI
Selective black nickel coatings on zinc surfaces by chemical conversion
P.K. Gogna,K. L. Chopra +1 more
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