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Solar absorption characteristics of several coatings and surface finishesSolar absorption characteristics are established for several films potentially favorable for use as receiving surfaces in solar energy collectors. Included in the investigation were chemically produced black films, black electrodeposits, and anodized coatings. It was found that black nickel exhibited the best combination of selective optical properties of any of the coatings studied. A serious drawback to black nickel was its high susceptibility to degradation in the presence of high moisture environments. Electroplated black chrome generally exhibited high solar absorptivities, but the emissivity varied considerably and was also relatively high under some conditions. The black chrome had the greatest moisture resistance of any of the coatings tested. Black oxide coatings on copper and steel substrates showed the best combination of selective optical properties of any of the chemical conversion films studied.
Document ID
19770013623
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Lowery, J. R.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
September 3, 2013
Publication Date
March 1, 1977
Subject Category
Energy Production And Conversion
Report/Patent Number
NASA-TM-X-3509
M-218
Report Number: NASA-TM-X-3509
Report Number: M-218
Accession Number
77N20567
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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