Process for applying thin molybdenum containing coatings on alum

Details Process for applying thin molybdenum containing coatings on alum Process for applying thin molybdenum containing coatings on alum

1977-06-03

1978-08-01

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 56R, C25D 544, C25D 912

Patent

active

041041364

ABSTRACT:
A thin, adherent coating is described that is highly absorptive to solar energy and has a low emissivity for thermal energy, thereby being a useful selective surface for solar energy collection. This coating is formed on aluminum and its alloys by a simple electrochemical process and consists of complex aluminum and molybdenum oxides and metallic molybdenum which are deposited as a near-monatomic layer of molybdenum and its oxides. The coating withstands exposure to 400.degree. F (204.degree. C) and 1 hour in boiling water without change in properties.

REFERENCES:
patent: 1923539 (1933-08-01), Jenny et al.
patent: 2356575 (1944-08-01), Frasch
patent: 3639221 (1972-02-01), Dorsey
patent: 3769180 (1973-10-01), Gedde
"Electroless Black Magis for Al, Attractive Black Finish for Al and Al Alloys", Bulletin EBMA 773, Mitchell-Bradford Co., Milford, Conn.
"Some Reflection & Radiation Characteristics of Al" by Cyril S. Taylor et al; Housing, Piping, & Air Cond., Jan. 1939, pp. 59-63.
"Bright Anodized Coats for Temp. Control of Space Vehicles" by James H. Weaver, Plating, Dec. 1964, pp. 1115-1172.
Handbook of Chem. & Physics 32nd Ed. 1950-1951, pp. 528-529.
"Coloring of Metals" Metal Finish Guidebook, 1975, pp. 485-486.
Abstract No. 47-0064P of Belgium Pat. No. 815,058. (May 17, 1973).
"Aluma Black, Cold Finish for Al" Birchwood Casey, Div. of Fuller Labs., Eden Prairie, Minn.

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