Difference between hot and cold galvanizing

Galvanized square pipe has two categories: hot-dip galvanized square pipe and electric galvanized square pipe. Hot-dip galvanized square pipe has wet method, dry method, lead-zinc method, REDOX method and so on. The main difference between different hot dip galvanizing methods is what method is used to activate the surface of the pipe to improve the quality of galvanizing after the acid dip cleaning of the steel pipe. At present, dry method and REDOX method are mainly used in production, and their characteristics are shown in the table. The surface of the zinc layer of electrogalvanizing is very smooth and compact with uniform structure. Good mechanical properties and corrosion resistance; The zinc consumption is 60% ~ 75% lower than that of hot dip galvanizing. Electrogalvanizing has a certain complexity in technology, but this method must be used for single-sided coating, double-sided coating with different thickness of internal and external surface coating, and thin-wall pipe galvanizing.