Process for coloring aluminium

Details Process for coloring aluminium Process for coloring aluminium

1975-10-17

1977-04-19

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

427436, C23F 700, C23F 502

Patent

active

040186288

ABSTRACT:
The invention allows one to obtain a strongly adherent dark grey to black coating, with good corrosion resistance, on aluminium and its alloys. The degreased aluminum is pre-treated in an aqueous solution containing at least one salt of a metal which is less electronegative than aluminium. It is then colored in another aqueous solution containing molybdate ions and at least one fluorine compound and/or a heavy metal chloride, and/or an organic chlorine compound with active chlorine atoms.

REFERENCES:
patent: 2554256 (1951-05-01), Lewis et al.
Fishlock, Metal Colouring, pp. 351, 353, Robert Draper Ltd., 1962.

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