What are the reasons for the corrosion of the chain link fence ?

1) Chemical corrosion refers to the corrosion caused by the direct chemical reaction between steel and the surrounding medium. Most of this corrosion is oxidation, resulting in the formation of loose oxides on the steel surface. At room temperature, steel surface formed a thin layer of passivation ability is very weak oxidation protective film FeO, it is loose, harmful medium can further enter and reaction, resulting in corrosion. In the dry environment, the corrosion progress is slow, and the reaction speed is accelerated with the increase of temperature and humidity.

2) Electrochemical corrosion is caused by the formation of galvanic cells on the surface of gold. Steel itself contains iron, carbon and other components, due to the different electric potential of these components, the formation of many microcells. In humid air, a thin film of water is adsorbed on the surface of the steel. In the Yang district. Iron is oxidized into Fe2 into the water film, because the water dissolved oxygen, oxygen in the negative area is reduced to OH --, the two combined into water insoluble Fe(oH)2, and further oxidized into loose and easy to peel red brown rust Fe(oH)3 hook mesh corrosion, with the increase in volume, serious up to six times the original volume.