In the atmosphere containing sulfur dioxide, hydrogen sulfide and marine, the corrosion resistance of zinc is poor, especially in the gas containing organic acid at high temperature and high humidity, the zinc coating is easily corroded.The standard electrode potential of zinc is -0.76V. For the steel substrate, the zinc coating is an anodic coating, which is mainly used to prevent the corrosion of steel, and its protective performance has a great relationship with the thickness of the coating. The protective and decorative properties of the zinc coating can be significantly improved after passivation treatment, dyeing or coating with a light protectant.

Zinc will oxidize in the air and form white rust on the surface, which is normal. If the steel pipe is hot-dip galvanized, due to the thick zinc layer, the formation of white rust does not affect the normal use, because the oxidation rate of zinc in the air is very slow. However, if it is electro-galvanized, the surface of the galvanized steel strip should be treated. There are impurities on the surface of the galvanized steel pipe, and the surface will oxidize under certain circumstances.

Galvanized steel pipe is a steel pipe made by cold-rolling or hot-rolling the steel plate, and then coating the surface with a layer of zinc. The galvanized layer on the surface will protect the steel pipe and prolong the service life. An alloy film will be formed on the surface of the steel pipe to improve the corrosion resistance of the galvanized steel pipe and protect the galvanized steel pipe from external erosion.

The production process of galvanized pipe

1.The first part is to first treat the steel pipe to be galvanized and decontaminate it with acid to achieve a clean and bright surface.
2.The second part is to clean with chemical solvent, and then put it into the hot-dip galvanizing tank to galvanize, which is also a very important step.
3.The third part is to coil the galvanized steel pipe into the warehouse.