12th International Conference on Zinc & Zinc Alloy Coated Steel Sheet - GALVATECH 2021

Gas wiping is one of the most important processes which determine the product quality in continuous galvanizing line. Here, there are many problems known as, stability of coating weight, edge splashing and full splashing. We focused on the full splashing phenomenon which the runback flow of zinc detaches the substrate and pours on the gas nozzle. Generally, this phenomenon is known to occur when the shear stress of the gas becomes too high compared to the surface tension of the liquid film. In this paper, further experiments were made by using molten zinc bath and rotating cylinder. And the effect of gas wiping condition on the behavior of the runback flow and full splashing was clarified.