Galvanized steel pipes will be used in some construction sites, but galvanized steel pipes will cause rust for a long time. Here we have a detailed understanding of the reasons for rusting galvanized steel pipes. We know these reasons we will know later. How to carry out maintenance can guarantee the service life of galvanized steel pipes.
Galvanized steel pipes are manufactured by cold-rolling or hot-rolling. The narrow and long steel plates are plated with zinc, which is divided into hot-dip galvanizing and electro-galvanizing. The coating of hot-dip galvanizing is more uniform, has strong adhesion and long service life. The chemical reaction with the plating solution can make the galvanized steel pipe corrosion-resistant, even if there is a strong corrosion resistance, the rust phenomenon will occur during use, then, what causes this?
The main reason for the rusting of galvanized steel pipes is the zinc coating on the surface. The chemical properties of zinc are relatively lively. It is soluble in acid and alkali. In a humid environment, zinc reacts chemically, forming a basic zinc carbonate film on the surface. When exposed to substances containing hydrogen sulfide, zinc is resistant to zinc. The corrosiveness is reduced and it is easily corroded, exposing the surface of the steel sheet and eventually rusting. The possibility of rusting of galvanized steel strips with electrogalvanizing methods is relatively low, because galvanized steel coatings are relatively thick and do not easily cause oxidation of the steel sheets, so they are not prone to rust.