Black chromium plating bath useful for solar reflecting coatings

Details Black chromium plating bath useful for solar reflecting coatings Black chromium plating bath useful for solar reflecting coatings

1990-07-18

1991-05-28

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

C25D 304

Patent

active

050192230

ABSTRACT:
The composition disclosed is an improved black chromium plating bath useful for solar selective coatings. The bath comprises an aqueous solution of sulphate-free chromic acid containing ions of nitrate, borate and fluosilicate. Being a room temperature black chromium bath, good quality black chromium deposite is obtained in the temperature range of 30.degree. C. to 50.degree. C. which is quite coherent and whose selectivity is better than 8.

REFERENCES:
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patent: 3620935 (1971-11-01), Willson
patent: 3720588 (1973-03-01), Oleson et al.
patent: 3723261 (1973-03-01), Byers et al.
patent: 3909404 (1975-09-01), Boycott
patent: 4174265 (1979-11-01), Minegishi et al.
Nguyen, "Industrial Black Chromium Electroplating," Chemical Abstracts 94 (22), No. 182528z (1980).

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