Hot dip galvanizing, also known as hot-dip galvanizing and hot-dip galvanizing, is an effective method of metal corrosion prevention, mainly used for metal structures and facilities in various industries. It is to immerse the derusted steel parts in molten zinc at around 500 ℃, so that a zinc layer is attached to the surface of the steel components, thereby achieving the purpose of corrosion prevention. The process flow of hot dip galvanizing: finished product pickling, water washing, adding auxiliary plating solution, drying, hanging plating, cooling, chemical treatment, cleaning, polishing, hot dip galvanizing. The principle of hot dip galvanizing is simply to immerse the cleaned iron parts into a zinc bath through the wetting effect of Flux, causing the steel to react with molten zinc to form an alloyed film. A good hot-dip galvanizing operation should ensure that all processes are strictly controlled and fully functional. And if the operation of the previous process is not good, it will cause chain adverse reactions in the subsequent process, which will significantly increase the operating cost or cause poor hot-dip galvanized products. If the pre-treatment is poor, the molten zinc cannot fully react with the steel, forming the most perfect galvanized film structure. If the post-processing is poor, it will damage the appearance of the galvanized film and reduce the value of the product