Stainless steel pipe fittings cap will rust under what conditions?

　　1. stainless steel pipe fittings deposited dust or heterogeneous metal particles containing other metal elements of the attachment, in the humid air, condensed water and adhesion between the stainless steel, the two together into a micro battery, causing the electrochemical reaction, the film has been destroyed, called electro chemical corrosion.

　　2. stainless steel pipe fittings cap adhesion of organic juice (such as vegetables, soup, sputum), oxygen in the water under the circumstances, a long time, organic acid, organic acid on the surface of metal corrosion.

　　3. stainless steel end caps for pipes adhesion contains acid, alkali, salt substances (such as decoration wall caustic soda, lime water splash), causing local corrosion.

　　4. in the polluted air (such as a large amount of sulfide, carbon monoxide, nitrogen oxides in the atmosphere), when condensation water is formed, sulfuric acid, acetic acid, acetic acid liquid point, causing chemical corrosion.