Thermal aging of electrodeposited black chrome
Evaluation of selective absorbing coatings for Sandia's Solar Total Energy Test Facility included electrodeposited black nickel, multilayer interference coatings and Harshaw's electrodeposited black chrome (ChromOnyx). Black nickel coatings, although having acceptable optical properties, were unstable at the operating temperature of the facility (approximately 310/sup 0/C) in air and at lower temperatures in the combined presence of heat and moisture. Multilayer interference coatings were expensive and difficult to apply to tubular geometries. There was also a question about long-term degradation of these coatings at 300/sup 0/C that might result from diffusion between the evaporated layers. Electrodeposited black chrome was selected as the most suitable selective coating for our application. With proper substrate and plating control, acceptable optical properties (solar absorptance, ..cap alpha../sub s/, greater than or equal to 0.95 and emittance, epsilon, at 300/sup 0/C less than or equal to 0.25) could be obtained with relative ease and at reasonable cost.
- Research Organization:
- Sandia Labs., Albuquerque, N.Mex. (USA)
- DOE Contract Number:
- EY-76-C-04-0789
- OSTI ID:
- 5155405
- Report Number(s):
- SAND-77-2112C; CONF-771230-1
- Country of Publication:
- United States
- Language:
- English
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Chemical, structural and optical characterization of a black chrome solar selective absorber
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Related Subjects
141000* -- Solar Collectors & Concentrators
AGING
BLACK COATINGS
CHALCOGENIDES
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
COATINGS
DEPOSITION
ELECTRODEPOSITION
ELECTROLYSIS
LYSIS
OXIDES
OXYGEN COMPOUNDS
SOLAR ABSORBERS
SPECTRALLY SELECTIVE SURFACES
SUBSTRATES
SURFACE COATING
SURFACES
TEST FACILITIES
THERMAL DEGRADATION
TOTAL ENERGY SYSTEMS
TRANSITION ELEMENT COMPOUNDS