Why is galvanized steel pipe corrosion resistant?

Galvanized steel pipe is made by reacting zinc in a molten metal state with an iron substrate to generate an alloy layer, thereby combining the substrate and the plating layer.

In the use of galvanizing technology, hot-dip galvanizing of galvanized steel pipe is to pickle the steel pipe first. In order to remove iron oxide on the surface of the steel pipe, after pickling, it is passed through ammonium chloride or zinc chloride aqueous solution or ammonium chloride and chloride. The zinc mixed aqueous solution tank is cleaned, and then sent to the hot dip plating tank.

Hot galvanizing has the advantages of uniform coating, strong adhesion and long service life. Therefore, through the hot-dip galvanizing technology, the steel pipe substrate and the molten plating solution undergo complex physical and chemical reactions to form a corrosion-resistant and dense zinc-iron alloy layer.

As a result, the alloy layer of the galvanized steel pipe is integrated with the pure zinc layer and the steel pipe base, so its corrosion resistance is strong.

Post time: Jan-08-2020