Zn-Al hot-dip galvanized steel sheet having improved resistance

Details Zn-Al hot-dip galvanized steel sheet having improved resistance Zn-Al hot-dip galvanized steel sheet having improved resistance

1987-08-04

1989-03-14

Rutledge, L. Dewayne

Stock material or miscellaneous articles

All metal or with adjacent metals

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

420514, 420519, B32B 1518

Patent

active

048123714

ABSTRACT:
A Zn-Al hot-dip galvanized coating on a steel sheet may exhibit intergranular corrosion and be degraded due to the Al's secular enrichment in the grain boundaries of coating. This is prevented in accordance with the present invention by the galvanizing bath composition which contains from 0.15 to 10% of Al, from 0.1 to 1% of Sb, from 0.01 to 2% of Si, and the balance being Zn and unavoidable impurities such as Pb, Sn, and Cd in an amount less than 0.02%, and additionally contains at least from 0.01 to 1% of at least one member selected from the group consisting of Mg and mischmetal.

REFERENCES:
patent: 3320040 (1967-05-01), Roe et al.
patent: 3782909 (1974-01-01), Cleary et al.
patent: 4056366 (1977-11-01), Lee et al.
patent: 4383006 (1983-05-01), Shindo et al.
patent: 4448748 (1984-05-01), Radtke et al.
patent: 4610936 (1986-09-01), Isobe et al.

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