Single-side continuous hot zinc-plating method for composite strip steel

Abstract

The invention relates to a single-side continuous hot zinc-plating method for composite strip steel, which comprises the following steps: performing water vapor oxidization on the surface of a special composite material to form a protective layer; based on the difference between decomposition pressures of iron oxide and chromium oxide, controlling dew points of the atmosphere to ensure that iron on a carbon steel surface is reduced but chromium on a composite layer surface is not reduced; performing zinc plating, and sweeping the small amount of liquid zinc bonded on the surface of the composite layer through hot air knives; and finally removing the surface oxidation layer of the composite layer through a physical method. The method can realize the large-scale production of a single-side zinc-plated composite material, can ensure that the carbon steel surface has a uniform and compact plated layer of which the thickness can be freely controlled, and can simultaneously ensure that the surface of the composite layer has no zinc layer and is smooth and beautiful.

Description

technical field [0001] The invention relates to the technical field of special composite strip steel, in particular to a single-side continuous hot-dip galvanizing method for composite strip steel. Background technique [0002] At present, due to its unique performance and low cost, bimetallic composite materials gradually replace single stainless steel in the field of weak corrosion, and become a new type of building decoration material integrating strength, corrosion resistance, luxury and beauty, saving and low price. . However, the current composite materials mostly use traditional isolation methods such as paint and spraying to improve the corrosion resistance of the carbon steel surface, which cannot be applied to environments such as impact and scratches. In addition, some composite materials form a galvanized protective layer by electroplating. Although the corrosion resistance of the carbon steel surface is improved to a certain extent, the bonding force of the zin...

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Problems solved by technology

However, the current composite materials mostly use traditional isolation methods such as paint and spraying to improve the corrosion resistance of the carbon steel surface, which cannot be applied to environments such as impact and scratches. In addition, some composite materials form a galvanized protective layer by electroplating. Although the corrosion resistance of the carbon steel surface is improved to a certain extent, the bonding force of the zinc layer is poor, the production cost is high, and the scale cannot be achieved. Production

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