Hot-dip galvanizing was developed from the older hot-dip method. It has a history of 140 years since France applied hot-dip galvanizing to industry in 1836. However, the hot-dip galvanizing industry has developed on a large scale in the past thirty years with the rapid development of cold-rolled strip steel.
The principle of galvanizing is to clean the iron parts, then treat them with solvent, dry them and then immerse them in the zinc liquid. The iron reacts with the molten zinc to form an alloyed zinc layer. The process is: degreasing, water washing, pickling, aid plating, drying, hot dip galvanizing Separate cooling passivation. With the discovery of industry, hot-dip galvanizing products have been used in many fields. The advantage of hot-dip galvanizing is that it has a long anti-corrosion life. The thickness of the alloy layer of hot-dip galvanizing mainly depends on the chemical composition such as the silicon content of the steel, and the cross-sectional area of the steel. Size, roughness of the steel surface, zinc pot temperature, zinc immersion time, cooling speed, cold rolling deformation, etc.
