Process for corrosion resisting treatments for aluminum surfaces

Details Process for corrosion resisting treatments for aluminum surfaces Process for corrosion resisting treatments for aluminum surfaces

1990-11-02

1992-02-18

Stoll, Robert L.

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

427444, 4274301, 427435, 427428, 427427, 427421, C23F 1118, C23F 1114, C23F 1100

Patent

active

050890646

ABSTRACT:
An exceptionally effective chromium free corrosion protective surface treatment composition for aluminum and its alloys is an aqueous acidic liquid comprising water and: (A) from about 0.8 to about 1.2 w/o of H.sub.2 ZrF.sub.6 ; (B) from about 0.08 to about 0.12 w/o of dispersed silica; (C) from about 0.08 to about 0.12 w/o of a water soluble or dispersible polymer of 3-(N-methyl-N-2-hydroxyethylaminomethyl)-4-hydroxystyrene; and (D) from 0.10 - 0.15 w/o of 1-propoxy-2-propanol. The surface to be treated is contacted with the composition and then dried without rinsing. A conventional organic coating may advantageously be applied over the surface produced by this treatment.

REFERENCES:
patent: 4277292 (1981-07-01), Tupper
patent: 4313769 (1982-02-01), Frelin et al.
patent: 4341558 (1982-07-01), Yarshiro et al.
patent: 4517028 (1985-05-01), Lindert

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