C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
117/74.5
C23C 2/02 (2006.01) C23C 2/06 (2006.01) C23C 2/28 (2006.01)
Patent
CA 1145625
TITLE: PROCESS FOR INCREASING ALLOYING RATE OF GALVANIZED COATING ON STEEL ABSTRACT OF THE DISCLOSURE 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°C and about 927°C) and thereafter hot-dip galvaniz- ing 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.
368398
Inland Steel Company
Meredith & Finlayson
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