Low foaming aqueous cleaning and passivating treatment for metal

Details Low foaming aqueous cleaning and passivating treatment for metal Low foaming aqueous cleaning and passivating treatment for metal

1994-09-14

1995-11-21

Lieberman, Paul

Compositions

Compositions containing a single chemical reactant or plural...

Organic reactant

252142, 252173, 25217421, 252525, 252527, 252544, C11D 348, C11D 330

Patent

active

054684129

ABSTRACT:
A cleaning and passivation treatment for metal surfaces which is essentially phosphate free and resistant to foaming in soft water is disclosed. The treatment solution includes relatively water insoluble surfactants without the use of conventional hydrotropes. The treatment solution includes an aqueous solution of monoethanolamine, boric acid, a non-ionic surfactant having a cloud point below about 25.degree. C. and a hydrotropic coupling agent preferably a combination of caprylic acid and capric acid.

REFERENCES:
patent: 3374171 (1968-03-01), Davis
patent: 4113498 (1978-09-01), Rones et al.
patent: 4540442 (1985-09-01), Smith et al.
patent: 4578208 (1986-03-01), Geke et al.

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