What Is The Difference Between Hot-dip Galvanized Rectangular Steel Pipe And Cold-dip Galvanized Square Pipe?

Cold galvanizing = electroplating, the zinc layer is very thin and easy to fall off, suitable for indoors;
Hot-dip galvanizing = dipped in zinc. The zinc layer is thick, uniform, and extremely corrosion-resistant. It is suitable for outdoor, engineering, and outdoor structures. When purchasing projects, look for hot-dip galvanizing, which is many times less durable.