PURPOSE: To carry out plating excellent in corrosion resistance and processability, by a method wherein molten Al or molten Al-Zn is floated on a molten lead bath in such a condition that a bottomless frame is arranged on said lead bath and a steel strip is passed through molten Al or molten Al-Zn within the frame from the lower part while introduced into the lead bath.
CONSTITUTION: A bottomless frame (d) is arranged in the vicinity of the molten lead bath (a) in a tank (g) so as to immerse the lower part (c) thereof in said molten lead both (a). On the molten lead (a') in this frame (d), a molten liquid (e) of Al or an Al-Zn alloy is floated. In this condition, a steel strip A to be plated of which the surface is preliminarily cleaned is introduced into the molten lead bath (a) from the upper part and, while the direction thereof is converted by a sink roll (f), passed through the molten liquid (e) of Al or the Al-Zn alloy floated within the frame (d) from the lower part of said frame (d) and upwardly drawn into the atmosphere. By this apparatus, Al or Al-Zn alloy plating excellent in corrosion resistance and good in processability can be applied to the steel strip to from a hardly peelable plating layer.
KOIZUMI YUTAKA
SAEKI SHIYOUSUKE
