Process of hot-dip galvanizing and alloying

Details Process of hot-dip galvanizing and alloying Process of hot-dip galvanizing and alloying

1977-11-30

1979-10-16

Kendall, Ralph S.

Coating processes

With post-treatment of coating or coating material

Heating or drying

427383D, 427225, 427321, 427349, 427398D, 427433, 118 63, 118 67, 118 69, C23C 102

Patent

active

041713940

ABSTRACT:
A method of producing a hot-dip galvanized steel strip having a uniform zinc-iron alloy coating on one surface and a formable hot-dip metallic zinc coating on the opposite surface which comprises forming a thin uniform hot-dip metallic zinc coating which has a coating weight less than 0.10 ounces per square foot on one side and a heavier metallic zinc coating on the opposite surface and passing the coated strip through a chamber having heating means and cooling means therein, said heating means, such as gas jets, adapted to apply heat directly only to the thin zinc coated side of the strip to convert the thin zinc coating into a fully alloyed zinc-iron coating, and said cooling means, such as air jets, adapted to blow cooling air onto the heavier zinc coating to effect rapid cooling thereof while the thin zinc coated side is being heated; thereby preventing formation of a thick zinc-iron intermetallic subsurface layer on the heavier coated side.

REFERENCES:
patent: 3056694 (1962-10-01), Mehler et al.
patent: 3112213 (1963-11-01), Lusa
patent: 4120997 (1978-10-01), Franks et al.

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