Spectral reflectance properties of electroplated and converted zinc for use as a solar selective coatingThe spectral reflectance properties of electroplated and chemically converted zinc were measured for both chromate and chloride conversion coatings. The reflectance properties were measured for various times of conversion and for conversion at various chromate concentrations. The values of absorptance, alpha, integrated over the solar spectrum, and of infrared emittance, epsilon, integrated over black body radiation at 250 F were then calculated from the measured reflectance values. The interdependent variations of alpha and epsilon were plotted. The results indicate that the optimum combination of the highest absorptance in the solar spectrum and the lowest emittance in the infrared of the converted electroplated zinc is produced by chromate conversion at 1/2 concentration of the standard NEOSTAR chromate black solution for 0.50 minute or by chloride conversion for 0.50 minute.
Document ID
19760035535
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mcdonald, G. E. (Harshaw Chemical Co. Cleveland, OH, United States)
Curtis, H. B. (NASA Lewis Research Center Cleveland, Ohio, United States)
Gianelos, L. (Harshaw Chemical Co. Cleveland, Ohio, United States)
Date Acquired
August 8, 2013
Publication Date
July 1, 1975
Subject Category
Optics
Meeting Information
Meeting: International Solar Energy Society Congress and Exposition