1. Hydrogen reduction galvanizing Hydrogen reduction galvanizing was invented in 1937. Hydrogen reduction hot-dip galvanizing laid the foundation for modern continuous hot-dip galvanizing. The product produced by hydrogen reduction method has better appearance quality and galvanized layer adhesion than solvent method galvanizing. The reduction method galvanizing enters the heating reduction furnace after pickling the strip steel, reducing the oxide film produced after the pickling with hydrogen, and generating a sponge-like reduction layer on the surface of the steel plate during the heating reduction process, after entering the zinc pot A layer of zinc-iron alloy layer with good bidirectional bonding force and uniformity can be produced, which greatly increases the adhesion of the zinc layer, which also determines the high energy consumption cost of the galvanizing method.
2. Ammonium chloride solvent method zinc plating Ammonium chloride solvent method zinc plating was invented in 1837. For products produced by the ammonium chloride solvent method, since the ammonium chloride solvent method of galvanizing has no heating reduction process, its appearance quality and the surface bonding force of the galvanized layer are slightly worse than that of the hydrogen reduction method. This also determines that the energy consumption cost of the galvanizing method is lower than that of the hydrogen reduction method.
