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Optimization and Thermal Degradation Study of Black Nickel Solar Collector Coatings

Research Area: Nanofabrication Year: 1985
Type of Publication: Article Keywords: photothermal collector coatings, thermal degradation
Authors: S. N. Patel; O. T. Inal; A. J. Singh; Axel Scherer
Journal: Solar Energy Materials Volume: 11
Number: 5-6 Pages: 381-399
Month: January
Black nickel selective solar surfaces were produced from a nickel chloride bath with additions of zinc chloride, ammonium chloride, and sodium thiocyanate. A linear regression model was used to find the optimum optical properties and to elucidate the roles of individual coating parameters. Three properties, namely plating time, current density, and sodium thiocyanate concentration were found to have the largest influence on the optical properties of the coatings. Several baths from the optimum region were tested, and coatings with absorptances of 0.95 and emittances in the range of 0.24 to 0.26, after heat treatment at 200°C for 18 h, were produced. The predominant degradation phenomena occuring at above 200°C were found by reflection electron diffraction and X-ray diffraction. These included a depletion of sulfur in the coating and the formation of a smooth copper oxide between the substrate and the coating.
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