Many customers say why stainless steel special screws also rust, stainless steel is not universal in a special reason will also rust screws factory summary reasons are as follows
1: The stainless steel surface contains deposits of dust or other dissimilar metal particles containing other metal elements. In moist air, the condensate between the deposit and the stainless steel connects the two into a microbattery, which triggers an electrochemical reaction. The protective film is damaged, which is called electrochemical corrosion.
Two: The surface of stainless steel adheres to the organic matter juice (such as vegetables, noodles, soup, etc.). In the presence of water and oxygen, organic acids are formed, and organic acids attack the metal surface for a long time.
Three: The surface of the stainless steel adheres with acids, alkalis, and salts (such as alkaline water and gray water splashing on the wall), causing localized corrosion.
Four: In the contaminated air (such as the atmosphere containing a large amount of sulfides, carbon oxides, and nitrogen oxides), in the event of condensation, sulfuric acid, nitric acid, and acetic acid liquids are formed, causing chemical corrosion.
Five: There is also the relationship between the stainless steel itself and trace elements such as nickel. If 304 is sure there is no 316 anti-rust performance. 304 is better than 201's anti-rust performance.