- The surface adhesion of the substrate is not cleaned and tidy: This type of leakage plating will spread to the lower or upper surface of the strip, generally showing aperiodic small patches.
Reason: The emulsified oil on the surface of the substrate is uneven, or there is residual rolling oil on the surface of the substrate. The solid air pollutants caused by the deformation and damage of the substrate are also the surface of the substrate that is polluted by the environment. In the whole process of cleaning the galvanizing equipment, if such residues are not cleaned neatly, it will cause the whole process of hot-dip galvanizing of strip steel, and the parts with air pollutants cannot be infiltrated by the zinc liquid, which is relatively It is easy to produce leakage plating.
- The air oxide layer is not reasonably reduced before entering the zinc pot: this type of leakage zinc will spread to the lower surface or upper surface of the steel plate of the galvanizing equipment. The leakage caused by the plating will also be more serious than that caused by the upper surface, and it also shows aperiodic distribution. What is the reason for the leakage of zinc caused by the equipment that lacks galvanized equipment? The crystal phase is generally block-shaped and small. black spot.
Reason: In the production process, the key to the quenching section is to clean up cold work hardening, ensure that the substrate responds to work hardening and the temperature of the zinc pot, and restore the strip. Enter nitrogen or hydrogen maintenance gas in the reduction furnace to make the atmosphere in the furnace a reducing atmosphere. For example, the air oxide layer cannot be reasonably reduced before entering the zinc pot, and the wettability of the zinc liquid to the substrate will be reduced, which is very important. prone to zinc leakage defects