Selective paint and black chrome coatings development. Semiannual report, June 5-December 5, 1978

Technical Report · Fri Dec 01 00:00:00 EST 1978

DOI:https://doi.org/10.2172/5717774· OSTI ID:5717774

Lin, R J.H.; Zimmer, P B

Solar selective black chrome and paint coatings were investigated to improve their performance and to develop techniques for large-scale applications. Formulations and processing conditions for thickness sensitive paint coatings were defined which consistently provide solar absorptance (..cap alpha..) of 0.90 and emittance (epsilon) of 0.10 on low emittance substrates. A significant improvement in abrasion resistance was achieved by decreasing the pigment volume concentration. Addition of aluminum flake to these formulations has resulted in a thickness insensitive coating with ..cap alpha.. = 0.90 and epsilon = 0.30. The critical bath components of a commercial black chrome plating process have been identified as hexavalent chromium, trivalent chromium, acetic acid and ferric ion. These components were varied and their effect on coating optical properties and durability at temperatures of 350-400/sup 0/C were studied. Coating thermal stability was significantly improved by reducing the trivalent chromium concentration from the normal 16 g/l to 12 g/l or less. Initial efforts have begun to optimize black chrome systems on aluminum substrates in terms of cost and durability.

• Research Organization: Honeywell, Inc., Minneapolis, MN (USA). Systems and Research Center
• Sponsoring Organization: USDOE
• DOE Contract Number: EM-78-C-04-4287
• OSTI ID: 5717774
• Report Number(s): ALO-4287-T1
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
BLACK CHROME
OPTICAL PROPERTIES
OPTIMIZATION
PLATING
BLACK COATINGS
PAINTS
SPECTRALLY SELECTIVE SURFACES
ABRASION
ABSORPTIVITY
ACETIC ACID
ALUMINIUM
CHROMIUM
DATA
DIP COATING
EMISSIVITY
FABRICATION
GRAPHS
IRON
PIGMENTS
SILICONES
STABILITY
TABLES
CARBOXYLIC ACIDS
COATINGS
DATA FORMS
DEPOSITION
ELEMENTS
INFORMATION
METALS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES
POLYMERS
SILOXANES
SURFACE COATING
SURFACE PROPERTIES
SURFACES
TRANSITION ELEMENTS
141000* - Solar Collectors & Concentrators