Welding Galvanized Pipe

Tianjin Kaida Import&Export Co.,Ltd is one of the leading manufacturers and suppliers of welding galvanized pipe in China, featured by quality products and low price. Please rest assured to buy cheap welding galvanized pipe from our factory. Contact us for discount information.

The significance of hot-dip galvanizing of Welding Galvanized Pipe lies in the fact that after a layer of galvanized coating covers the surface of steel, the corrosion resistance is greatly improved, which can save materials and resources. Welding Galvanized Pipe has good economic and environmental benefits.

The protective effect of the galvanized layer of Welding Galvanized Pipe on the surface of steel mainly includes the following situations:

① When the surface of Welding Galvanized Pipe galvanized steel parts is intact, only zinc corrosion occurs. Due to the good protective effect of zinc corrosion products on zinc, the corrosion rate is very slow and the service life is 15-30 times that of non galvanized steel parts.

② The most common situation is that during the use of Welding Galvanized Pipe galvanized steel parts, the surface is scratched or the coating is locally damaged due to other reasons. The steel is exposed to the environment from the wound. If the coating is a non-metallic substance, the exposed steel substrate will be quickly corroded. However, the sacrificial protective performance unique to Welding Galvanized Pipe galvanized steel parts slows down the corrosion rate. This is because the zinc in the coating and the iron in the steel form the primary battery in a humid environment. Due to the standard electrode potential of zinc being only -1.05V, which is lower than iron's -0.036V, zinc is oxidized as the anode, while iron is protected as the cathode. Due to the dense and slow reaction rate of the products generated after zinc corrosion, the overall corrosion resistance is greatly improved. This anti-corrosion method is called sacrificial anti-corrosion.

③ In general, the corrosion of Welding Galvanized Pipe galvanized steel parts is not caused by the uniform corrosion of the surface galvanized layer, but by the first corrosion of the coating in areas where the bonding between the coating and the steel substrate is poor, resulting in severe localized corrosion and loss of usability. From this point of view, the adhesion of the galvanized layer of Welding Galvanized Pipe, especially the overall adhesion, is more important than the thickness of the galvanized layer. If the local adhesion of the galvanized layer is poor, even if the galvanized layer is thick, it will start to rust from the poor adhesion. This is similar to the "bucket principle", which is a problem that hot-dip galvanizing production technicians must understand.

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