Brief introduction to the plating ability of zinc liquid on packaging steel strip

After the packaging steel strip enters the molten zinc liquid, the zinc liquid can be evenly plated on the packaging steel strip, and the bonding force between the coating and the substrate is strong. This feature is called the galvanizing property of the zinc liquid on the packaging steel strip.
　　The reason why zinc liquid can be plated on packaging steel strip is that the zinc liquid has wettability for packaging steel strip, that is, after the packaging steel strip enters the zinc liquid, the two can be in close contact with each other, and the packaging steel After the belt leaves the zinc pot, the zinc liquid on its surface can be more evenly attached to the surface of the packaging steel belt. The first thing that works is the physical action, that is, the result of the surface tension between the two.
　　The difference in surface tension on the contact surface of the two different phases of solid and liquid substances generally depends on the density difference between the two. If the density of the solid is larger and the density of the liquid is smaller, the larger tension on the solid surface can make the liquid spread evenly on the solid surface. This means that the solid has good wettability after being put into the liquid. Plating. Otherwise, the liquid will form a spherical shape on the solid surface, that is to say, the wettability is not good, and the plating property is not good on the hot-dip plating. This mechanism of action is exactly the opposite of the pre-treatment degreasing process. On the surface of water and oil, the surface tension of water is large, while the surface tension of oil is small. Therefore, the oil cannot become spherical. Only after the surfactant is added, the surface of the water can be improved. Only when the tension is reduced, lower than the surface tension of the oil, can the oil become spherical oil droplets to be removed.