Organic composite coated steel strip having improved corrosion r

Details Organic composite coated steel strip having improved corrosion r Organic composite coated steel strip having improved corrosion r

1990-10-16

1994-03-15

Fuller, Benjamin R.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428632, 428659, B32B 1508, B32B 1500

Patent

active

052944859

ABSTRACT:
Organic composite coated steel strips having improved corrosion resistance, weldability and coating adherence are obtained when an organic composite layer is applied to a chromate layer on a zinc or zinc base alloy plated steel substrate. The chromate layer containing up to 70% of Cr.sup.6+ based on the total chromium weight is coated in a weight of 5 to 500 mg/m.sup.2 of Cr. The organic composite layer is formed to a dry weight of 0.2 to 3.0 g/m.sup.2 from a coating composition comprising (A) a silica sol having silica dispersed in an organic solvent with a water content of up to 3.0%, the silica having an organic deposit on its surface in an amount of up to 5.0% of C based on the total silica weight, the silica having an average particle size of 0.05 to 3.0 .mu.m and a specific surface area of 50 to 800 m.sup.2 /g, and (B) an organic resin binder having a number average molecular weight of at least 2,000. The coated strips are suitable for use as automobile bodies by press forming.

REFERENCES:
patent: 4049781 (1977-09-01), Acker et al.
patent: 4775600 (1988-10-01), Adaniya et al.
patent: 4804587 (1989-02-01), Takeuchi et al.
patent: 4985311 (1991-01-01), Shindou et al.
Patent Abstracts of Japan, vol. 13, No. 84 (C-572) (3432) Feb. 27, 1989, JP-A-63-270480.

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