How to remove rust from galvanized steel pipes?

1. First use solvent to clean the surface of the steel to remove organic matter on the surface.
2. Then use rust removal tools (wire brushes) to remove loose or tilted scales, rust, welding slag, etc.
3. Use pickling.
Galvanizing is divided into hot plating and cold plating. Hot plating is not easy to rust, while cold plating is easier to rust.