Black chrome coatings development. Final report, 5 June 1978-4 August 1979

Technical Report · Wed Aug 01 04:00:00 EDT 1979

OSTI ID:5856751

Lin, R J.H.; Heckler, S E

Solar selective black chrome plating bath formulations were studied in an effort to improve the black chrome thermal stability and to determine optimal ranges of each bath component. Various substrate/undercoat systems were also investigated to select the most cost-effective black chrome systems. 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 to 400/sup 0/C was 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. Optimal ranges of plating bath components and plating parameters were established. Steel/undercoat/black chrome systems were prepared and tested for environmental durability. The steel/chrome (1/10 mil)/nickel (1/10 mil)/black chrome was selected as the optimal system. Various aluminum/undercoat/black chrome systems have also been prepared and tested in environmental chambers. Based on cost and durability data, the Al/Zn (Flash)/Ni (1/2 mil)/BCr system has been chosen as being most cost-efficient. A feasibility study showed that it was possible to produce a zinc/nickel/black chrome coating system continuously on aluminum foil.

• Research Organization: Honeywell, Inc., Minneapolis, MN (USA). Systems and Research Center
• DOE Contract Number: AC04-78CS14287
• OSTI ID: 5856751
• Report Number(s): DOE/CS/14287-T1; ON: DE82004749
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
141000* -- Solar Collectors & Concentrators
36 MATERIALS SCIENCE
360201 -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ACETIC ACID
ALLOYS
ALUMINIUM
BLACK CHROME
BLACK COATINGS
CARBOXYLIC ACIDS
CHROMIUM
CHROMIUM COMPOUNDS
COATINGS
DEPOSITION
DISPERSIONS
ELEMENTS
EQUIPMENT
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
METALS
MIXTURES
MONOCARBOXYLIC ACIDS
NICKEL
ORGANIC ACIDS
ORGANIC COMPOUNDS
PLATING
QUANTITY RATIO
SOLAR EQUIPMENT
SOLUTIONS
SPECTRALLY SELECTIVE SURFACES
STABILITY
STEELS
SURFACE COATING
SURFACES
TESTING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZINC