Because the galvanized layer for the protective layer of the iron substrate on the one hand, although zinc is more active than iron easy to oxidize, but its oxidation film is not as loose as iron oxides, zinc oxide is more dense. Surface formation and dense oxide layer, thus inhibiting the further oxidation of the internal iron. Especially after passivation of the galvanized layer. Surface oxide layer will be more dense. Itself has a high resistance to oxidation, on the other hand, when the surface of the galvanized layer is damaged, exposing the internal iron matrix, then, zinc will assume the role of seven sacrificial zinc anode, zinc will be oxidized before iron. This protects the iron from being damaged.

Galvanized iron wire rust time, mainly and the thickness of the galvanized layer and the use of the environment, galvanized iron wire is actually divided into cold galvanized iron wire and hot-dip galvanized iron wire, in general, hot-dip galvanized iron wire galvanized layer is thicker, the longer the rust prevention time, generally can be used for 7, 8 years without rust. Will galvanized iron wire rust? If the galvanized layer is damaged, or long-term use in a humid environment, it will also accelerate the time of galvanized iron wire rust.