Chemical method of avoiding a rainbow effect caused by the layer

Details Chemical method of avoiding a rainbow effect caused by the layer Chemical method of avoiding a rainbow effect caused by the layer

1990-05-23

1991-04-23

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, 204140, 2041415, C25D 1124, C25F 320

Patent

active

050097563

ABSTRACT:
There is described a chemical method for the avoidance of a rainbow effect which is caused by the layer of oxide produced upon the brightening of parts of aluminum or aluminum alloys, in which the parts are degreased or cleaned in a first process step and then subjected to electrolytic-alkaline brightening in a second process step, the method being characterized by the fact that, after the brightening, the parts are subjected to a further treatment in which the parts are first of all washed in water and then exposed in a chromic-acid solution preferably containing about 50 grams per liter of CrO.sub.3 at about 98.degree. C. for about 3 minutes and finally washed again in a sodium hydrosulfite solution.

REFERENCES:
patent: 2040617 (1936-05-01), Mason et al.
patent: 2040618 (1936-05-01), Mason et al.
patent: 2108603 (1938-02-01), Mason
patent: 2153060 (1939-04-01), Guthrie
patent: 2708655 (1955-05-01), Turner
patent: 2721835 (1955-10-01), Axtell
patent: 3957553 (1976-05-01), Smith

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