G40 SGCC Galvanized Steel Coil Stainless Steel Strip Coils

Galvanizing industrial methods
(1) Wet hot-dip galvanizing: The solvent on the surface of the steel plate enters the zinc liquid covered with the molten solvent on the surface without drying (that is, the surface is still wet) for hot-dip galvanizing. The disadvantages of this method are:
a. Galvanizing can only be done in a lead-free state. The alloy layer of the coating is very thick and has poor adhesion.
b. The generated zinc slag accumulates at the interface between the zinc liquid and the lead liquid and cannot be deposited on the bottom of the pot (because the specific gravity of the zinc slag is greater than that of the zinc liquid but less than that of the lead liquid). In this way, the steel plate passes through the zinc layer and pollutes the surface. Therefore, this method has been basically eliminated.
(2) Single steel plate: This method generally uses hot-rolled stacked plates as raw materials. First, the annealed steel plate is sent to the pickling workshop, and sulfuric acid or hydrochloric acid is used to remove the oxy-hot-dip galvanized iron scale on the surface of the steel plate. After pickling, the steel plate immediately enters the water tank to soak and wait for galvanizing, which can prevent the steel plate from being oxidized again. Afterwards, it undergoes pickling, water cleaning, squeezing, drying, hot-dip galvanizing in a zinc pot (the temperature is maintained at 445-465°C), and then oiling and chromating. The quality of hot-dip galvanized sheets produced by this method is significantly improved compared to wet galvanizing, and it is only of certain value for small-scale production.
(3) Huilin Fare: This continuous galvanizing production line includes alkali degreasing, hydrochloric acid pickling, water washing, and solvent coating.