Abstract
The paper presents the concept of a new technology for the hot-dip galvanizing of steel wire. The wire to be coated is immersed in a bath of molten zinc after induction pre-heating in a reduction atmosphere (nitrogen and hydrogen) and subsequent fluxing. The method is based on running the wire vertically down through the zinc bath and a special ceramic nozzle. The model of a hot-dip galvanizing process includes such physical parameters as: wire diameter, diameter of nozzle, length of the cylindric part of the nozzle, depth of the liquid zinc bath, wire temperature, temperature of the liquid zinc bath, wire velocity and the pressure of the neutral gas under the nozzle. The algorithm for calculating the thickness of the zinc coating is given. The results of the first semi-technical experiments of wire galvanizing using this method are given. It has been found that it is possible to obtain very thick zinc layers, up to 170 μm, on wires of ø2 mm and that these coatings have a very good formability.
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