Process for providing aluminum substrates with light-absorptive

Details Process for providing aluminum substrates with light-absorptive Process for providing aluminum substrates with light-absorptive

1978-03-01

1979-03-20

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

204 35N, 427160, C23F 706, C23F 502

Patent

active

041452348

ABSTRACT:
To provide a substrate of aluminum with a dark surface layer of high absorption/emission ratio for luminous energy, the degreased and pickled substrate is immersed in a hot chromating bath until an oxide coating of not more than 2.5.mu. thickness is formed thereon. This coating is then colored black in a hot, acidic dyeing solution (pH between about 0.5 and 5) of potassium permanganate and a nitrate of cobalt or copper.

REFERENCES:
patent: 1965269 (1934-07-01), Tostevud
Fish lock, Metal Colouring, Robert Draper Ltd., (1962), pp. 350, 351.

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