Galvanized tube, also known as galvanized steel pipe, is divided into two kinds, hot galvanizing and galvanizing. Hot dip galvanized zinc coating is thick, which has the advantages of uniform coating, strong adhesion and long service life. The cost of galvanizing is low, the surface is not very smooth, and its corrosion resistance is much worse than that of the hot galvanized pipe.
There will be a coating on the outside of the galvanized pipe. The cleaning agent will reduce the friction between the brush and the guardrail, which affects the effect of the cleaning. And the chemicals that contain it will directly cause the outer layer to fall off, which will directly lead to the reduction of the service life of the galvanized pipe and the effect of reducing the safety.
The tube matrix and the molten plating bath have complex physical and chemical reactions, forming a corrosion-resistant and tightly structured zinc - iron alloy layer. The alloy layer is integrated with the pure zinc layer and the steel tube matrix. Therefore, its corrosion resistance is strong. The zinc layer is electroplating layer, and the zinc layer and the steel tube matrix are stratified independently. The zinc layer is thinner and the zinc layer is simply attached to the steel tube matrix, which is easy to fall off. Therefore, its corrosion resistance is poor.
Now the general galvanized steel pipe is used in hot galvanizing, and electrical use trough etc. with the cold galvanized, color has certain difference, only in the cold plating tube wall galvanized, hot dip galvanized welded pipe inside and outside plating is based on reheat welded steel pipe galvanized, the outer and inner walls with steel tube when there is a layer of zinc layer.
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