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Difference between cold galvanizing and hot galvanizing for galvanized steel grating
★ the surface treatment methods are different: hot dip galvanizing is also called hot dip galvanizing. It is to melt the zinc ingot at high temperature, put some auxiliary materials into it, and then immerse the metal structure into the galvanizing tank to make a zinc layer adhere to the metal component. It belongs to electrochemical reaction.
The amount of zinc applied to the general hot-dip galvanized steel grating is about 70UM, the adhesion and hardness of the galvanized layer are good, and the corrosion resistance of the hot-dip galvanized steel grating is good, which is generally suitable for outdoor use. "Cold plating" is "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 applied is very small. The amount of zinc applied for electro galvanizing is only about 10g, which belongs to physical treatment. It is easy to fall off in wet environment. The corrosion resistance of cold galvanized steel grating is not so good, and it is generally used indoors.
★ color difference: generally, the color of hot-dip galvanized steel grating is bright and silver white, while the color of electro galvanized steel grating is dark and dirty white.
★ different prices: the cost of hot galvanizing treatment per ton of steel grating is about 1500 yuan, and the cost of cold galvanizing treatment is about 800 yuan.
★ different service time: the hot galvanized steel grating can be used for about 30-40 years, while the cold galvanized steel grating is easy to rust and slowly corrode, so it can not be used for about 1-2 years.
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