| 摘要 |
FIELD: methods of continuous deposition of zinc coating. SUBSTANCE: method includes successive production of steel sheet coated with iron-zinc alloy and steel sheet with zinc coating on one line of continuous hot zinc plating without stopping the line. Steel sheets are passed through zinc bath with silicon and aluminum. In this case, content of aluminum amounts to at least 0.05 to less than 0.15 wt.% and content of silicon ranges from 0.05 wt.% to saturation. Diffusion heat treatment is carried out to produce coating from iron-zinc alloy, and then content of aluminum is increased in bath to more than 0.15 wt.% but not more than 0.5 wt.%, and then steel sheets are passed through bath to obtain zinc coating. EFFECT: higher efficiency. 7 cl, 1 tblx
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