After the steel coil or plate is galvanized, the service life can be greatly extended. If the zinc layer on the steel sheet is not destroyed, the zinc can prevent the corrosive medium (water, oxygen, carbon dioxide, etc.) from contacting the surface of the steel sheet, which is exactly the same as the anti-corrosion effect of the tin plating layer. However, if the galvanized layer is destroyed and the iron of the individual parts is exposed to the surface, since the chemical properties of zinc are more active than iron, zinc and iron form micro-batteries during the etching process, and zinc is the anode of the micro-battery. It is dissolved, and iron is protected by the cathode.
Therefore, the galvanized vessel will not rust even if it is partially exposed to iron. If the iron surface is exposed too much, the iron is corroded like ungalvanized. It can be seen that the galvanized sheet has good anti-rust properties and is widely used in the construction, vehicle, furniture, mechanical, electrical and packaging industries.
