Process for increasing alloying rate of galvanized coating on st

Details Process for increasing alloying rate of galvanized coating on st Process for increasing alloying rate of galvanized coating on st

1980-03-10

1981-08-25

Kendall, Ralph S.

Coating processes

With post-treatment of coating or coating material

Heating or drying

427406, 204 37R, 204 38S, 428658, 428677, C23C 102

Patent

active

042859956

ABSTRACT:
A method of increasing the rate of formation of zinc-iron alloy when hot-dip galvanizing a ferrous metal strip to effect complete alloying of the hot-dip zinc coating on at least one side of the strip, wherein a clean ferrous metal strip is provided on at least one lateral surface of the strip with a coating of metallic copper and heating the strip in a non-oxidizing atmosphere to a temperature sufficient to diffuse a portion of the copper coating into the ferrous metal strip (i.e. heating to a temperature between about 724.degree. C. and about 927.degree. C.)and thereafter hot-dip galvanizing the strip. With a very thin hot-dip zinc coating (i.e. having a thickness less than 0.1 mil) no further heating of the strip is necessary in order to provide on at least the one lateral surface a zinc-iron alloy diffusion coating free of unalloyed metallic zinc.

REFERENCES:
patent: 213015 (1879-03-01), Wahl et al.
patent: 1096636 (1914-05-01), McIlroy
patent: 2115749 (1938-05-01), Rubin
patent: 2378458 (1945-06-01), Avallone
patent: 2392456 (1946-01-01), Brown et al.
patent: 2490700 (1949-12-01), Wachtman
patent: 2918722 (1959-12-01), Kenmore
patent: 3762883 (1973-10-01), Shepard et al.

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