Hot dip galvanizing is an effective way of metal corrosion prevention, which is mainly used in metal structures and facilities in various industries. It is to immerse the de-rusted steel parts into the molten zinc at about 500℃, so that the zinc layer is attached to the surface of the steel members, so as to achieve the purpose of corrosion prevention. Cold galvanizing, generally speaking, requires no heating, and the amount of galvanizing is very small. Such galvanized parts are easy to fall off in wet environments. 2. Difference between hot galvanizing and cold galvanizing: Hot dip galvanizing is also called hot dip galvanizing. It melts the zinc ingot at high temperature, puts some auxiliary materials, and then immerses the metal structure into the galvanizing tank to make a layer of zinc layer attached to the metal components. The advantages of hot-dip galvanizing are its strong anti-corrosion ability, good adhesion and hardness of zinc coating. "Cold plating" means "electroplating", that is, the zinc salt solution is electrolyzed to coat the plated parts. Generally speaking, there is no heating, and the amount of zinc is very small. It is easy to fall off in a wet environment. Hot dip galvanizing is a chemical treatment and belongs to an electrochemical reaction. Cold galvanizing is a physical treatment, only a layer of zinc is brushed on the surface, so the zinc layer is easy to fall off. Hot galvanizing is often used in building construction. Continuous hot galvanizing process: steel → heating → cooling to galvanizing temperature → galvanizing → cooling. Cold galvanizing is electro galvanizing, which is only 10-50g/m2, and its corrosion resistance is much different from that of hot-dip galvanizing. The price of electro galvanizing is relatively cheaper. Hot dip galvanizing refers to galvanizing the surface of the steel body under the condition of hot dip. It has strong adhesion and is not easy to fall off. Although the hot dip galvanizing pipe is rusted, it can meet the technical and health requirements for a long period. 3. Process difference First of all, the process difference is: hot galvanizing is to dip the workpiece into the molten zinc solution for a certain time after degreasing, pickling, dipping and drying, and then putting it out.