Hot-dip galvanizing is a process in which iron or steel is immersed in molten zinc, forming a zinc coating on the surface through a chemical reaction. The process primarily involves the following steps:
Pre-treatment: The surface of the iron or steel undergoes degreasing, derusting, and cleaning to ensure the molten zinc can make full contact with the metal surface.
Preparation of the zinc bath: Zinc ingots are placed in a galvanizing tank and heated until they melt into a molten zinc bath.
Hot-dip galvanizing: The pre-treated iron or steel is immersed in the molten zinc bath and held there for a specific period, allowing the zinc to react with the metal surface and form a zinc coating.
Cleaning and drying: After galvanizing, excess zinc is removed from the iron or steel through methods such as rinsing or brushing to ensure a smooth finish; the material is then dried to prevent the zinc coating from peeling off.