1. Essential difference The anode of the galvanized electrolysis equipment is connected to the processing power supply, and the current is used to move from positive to negative to deposit a layer of zinc on the workpiece.

Hot-dip galvanizing, also known as hot-dip galvanizing, is a method of immersing steel hooks in zinc liquid to obtain a metal coating. It is to remove the ol, pick, soak and dry the workpiece, and then soak it in the zinc solution for a period of time, then it can be maintained.

2. Cold galvanizing uses chemical principles to separate zinc alloys into zinc ions and attach them to the surface of steel. Generally, the zinc layer is thin, and the steel is easy to corrode in the general environment. Generally, cold-dip galvanized steel products and structural parts are used for anti-corrosion, and the amount of galvanized cold-dip galvanized is very small, only 10-50g per square meter.

As we all know, the atmospheric corrosion resistance mechanism of zinc is mechanical protection and electrochemical protection. Under atmospheric corrosion conditions, the surface of the zinc layer has a protective film of ZnO, Zn(OH)2Jl and basic zinc carbonate, which slows down the corrosion of zinc. When this protective film (also known as white rust) is damaged, a new film will form. When the zinc layer is severely damaged and endangers the iron substrate, zinc can electrochemically protect the substrate. The standard potential of zinc and iron is -0.76V, and the standard potential of iron is -0.44V. When zinc and iron form a microbattery, the zinc is dissolved as the anode and the iron is protected as the cathode. The formation process of the hot-dip galvanized layer is the process of forming an iron-zinc alloy between the iron substrate and the outer pure zinc layer. When hot-dip plating is carried out on the surface of the workpiece, an iron-zinc alloy layer will be formed. In this way, the iron layer and the pure zinc layer will be well combined.

3. The appearance is different, the surface of hot-dip galvanized is rough, and the surface of cold-dip galvanized is bright and smooth.
The application difference between galvanized bolts and hot-dip galvanized bolts-how many years can hot-dip galvanized bolts keep rust-free.