Cold galvanizing (electro-galvanizing) is in the electroplating tank through the current unidirectional so that the zinc gradually plated on the metal surface, the production speed is slow, the plating layer is uniform, the thickness is relatively thin, generally as long as 3-15 microns, the appearance of the bright, corrosion resistance is poor, and after a few months will be rusted. Relative to hot-dip galvanizing, electro-galvanizing production cost is lower.

Hot-dip galvanizing is dip-plating within a heated zinc solution, which is fast to produce and has a thick but uneven coating, with a minimum thickness of 45 microns and a maximum of 300 microns or more. The color is darker, consumes more zinc metal, has good corrosion resistance, and hot-dip galvanizing can be used for decades in outdoor environments.

Cold galvanized and hot-dip galvanized difference is on the amount of zinc is different, can identify them from the color, cold galvanized silver with yellow. Hot-dip galvanizing is white. Hot-dip galvanized use scale: because of the thicker layer, hot-dip galvanized than electro-galvanized protection performance is good, so it is used for strict working environment of the steel parts of the main maintenance of the coating. Hot-dip galvanized finished products in chemical equipment, oil processing, marine exploration, metal structures, electric power delivery, shipbuilding and other occupations have a wide range of uses, in the agricultural sector such as pesticide sprinkler irrigation, warming house and construction industry such as water and gas delivery, wire casing, scaffolding, bridges, highway guardrail, etc., has been a large number of these years has been selected.