Galvanized corrugated steel plate leakage point

The leakage point mainly refers to the unplated area which is not completely soaked in the process of hot dip plating. In the process of hot dip galvanizing, only by completely eliminating the oxide sheet and oxide and cleaning solution of the substrate rolling, while exposing the relatively clean surface of the substrate, can good wettability be ensured. In general, rolling mills will produce automobile cladding parts with Al content exceeding 0.2% zinc solution. The hot dip galvanized steel plate produced in this zinc pot is relatively bright, but when the zinc liquid reaches the content of Al, in order to obtain good wettability, there are more stringent requirements for the cleanliness of the substrate surface. Steel plates with relatively high strength usually contain related alloying elements such as C, P and Si, and these alloying elements are likely to be segregated during heat treatment, thus forming oxides on the surface of the steel plate. In this regard, the Si contained in the substrate will lead to more leakage points, which seriously affects the wettability.