First, essential difference placed zinco connected to the anode electrolytic equipment, processing power, use current from the positive to the negative directional move, deposits a layer of zinc on the workpiece.

Hot-dip galvanizing is also hot dip zinc, which is a method of obtaining metal cover by immersing steel hook into molten zinc solution. It is to remove ol, picking, soaking and drying the workpiece and immerse it in molten zinc solution for time, which can be raised.

Cold galvanizing uses chemical principles to separate zinc alloy into zinc ions, which are attached to the surface of steel. The general zinc layer is thin, and steel is easy to corrosion in the general environment. General cold galvanized steel products and structures for anticorosion, cold galvanized galvanized quantity is very small, only 10-50g per square meter.

As is known to al, the mechanism of atmospheric corrosion resistance of zinc is mechanical protection and electrochemical protection. Under atmospheric corosion conditions, zinc layer surface has ZnO, Zn(OH)2Jl and basic zinc carbonate protective flm, which slows down the corrosion of zinc. This protective film (also known as white rust) wil form a new flm after being damaged. When the zinc layer is seriously damaged and endangers the iron matrix, zinc produces electrochemical protection for the matrix. The standard potential of zinc and iron is -0.76V, and the standard potential of iron is -0.44V. When zinc and iron form microcells, zinc is dissolved as the anode, and iron is protected as the cathode. The formation process of hot-dip galvanizing layer is the process of forming fe-zinc alloy between the iron base and the outer pure zinc layer. During hot plating on the workpiece surace, fe-zinc alloy layer will be formed. In this way, the iron and pure zinc layer will combine well.

Three, the appearance diference on the outside, hot galvanizing looks rough, while cold galvanizing is brighter and smoother.

Application diference between galvanized and hot dip galvanized bolts-how many years can hot dip galvanized bolts remain rust free.