What is the cause of the leakage of galvanized steel strap

One reason for galvanized packaging steel strips is that the surface of the substrate is contaminated by uncleaned foreign objects. Most of these defects are distributed on the lower or upper surface of the strip, showing irregular plaques and uneven surface of the substrate. Solid pollutants such as emulsifiers, residual rolling oil distributed on the surface of the substrate, iron powder generated by the deformation of the substrate and abrasion will cause impurities to form on the surface of the substrate. If these problems are improperly handled in the processing of the steel strip, leakage will occur. plating. In addition, the oxide layer is not effectively reduced before entering the zinc pot. That is to say, in production, nitrogen and hydrogen protective gas are introduced into the reduction furnace, which reduces the atmosphere in the furnace, and the oxide layer before entering the zinc pot If it cannot be effectively reduced, the wettability of the zinc solution to the substrate will be reduced, which is easy. In this case, the skip plating mainly occurs on the upper and lower surfaces of the galvanized sheet, and the defect forms are flaky pinhole black spots. The three reasons are that the peeling of the refractory material affects the surface quality of the galvanized sheet. The peeling mainly occurs in the process of opening and shutting down the furnace, which affects the quality of the galvanized sheet. This kind of defect is also distributed on the upper or lower surface, and the defect shape is along the The strip steel is distributed longitudinally in the running direction, and the whole is strip-shaped.