The corrosion resistance of Hefei stainless steel plate mainly depends on chromium. Chromium has high chemical stability, can form a passivation film on the surface of steel to isolate the metal from the outside, protect the steel plate from oxidation and increase the corrosion resistance of the steel plate. After the passivation film was destroyed, the corrosion resistance decreased.

The following are the causes of corrosion caused by the destruction of passive film on the surface of Hefei stainless steel plate

The surface of stainless steel is deposited with dust containing other metal elements or the attachment of heterogeneous metal particles. In humid air, the condensation water between the attachment and stainless steel forms a micro battery, which causes electrochemical reaction and damages the protective film, which is called electrochemical corrosion. The surface of stainless steel adheres organic juice (such as melon, vegetable, noodle soup, phlegm, etc.) on the surface of stainless steel In the case of water and oxygen, organic acid is formed, which will corrode the metal surface for a long time; acid, alkali and salt substances (such as alkali water and lime water splashing on the decoration wall) are adhered on the stainless steel surface, causing local corrosion; in the polluted air (such as the atmosphere containing a large amount of sulfur compounds, carbon oxide and nitrogen oxide), sulfuric acid, nitric acid and acetic acid liquid are formed in the presence of condensed water Point, causing chemical corrosion.