What is the cause of the stainless steel butterfly pneumatic valve surface rust?

stainless steel butterfly pneumatic valve is formed on the surface of a layer of a very thin and fine and stable solid rich chromium oxide film ( Protective film) To prevent the oxidation of oxygen infiltration, continue, and ability to resist corrosion. Once you have some reason, the film has been continuously destroyed and air or oxygen atoms in the liquid iron atoms will constantly infiltration or metal separation out unceasingly, forming loose iron oxide, metal surface are also constantly rust.
stainless steel butterfly advantages of pneumatic valve:
stainless steel butterfly pneumatic valve to oxidation in the atmosphere, with acid, alkali, salt medium corrosion, so the all stainless steel butterfly pneumatic valve has the characteristics of wear-resisting corrosion resistance. These characteristics can be fully embody the stainless advantage, but in some special environment medium will appear the possibility of rust, here introduce a few kinds:
. Stainless steel butterfly pneumatic valve surface adhesion organic juice ( Such as vegetables, noodle soup, sputum, etc. ) , under the condition of water is oxygen, organic acid, organic acid to for a long time and are on the surface of the metal corrosion.
。 Pneumatic valve's deposited on the surface of the stainless steel butterfly contain other metal elements of attachments, or heterogeneous metal particles of dust in the humid air, attachments and stainless steel, the condensed water between the both together as a micro battery, triggers the electrochemical reaction, protective film is damaged, to call the electrochemical corrosion.
。 Stainless steel butterfly pneumatic valve surface adhesive containing acid, alkali, salt substances ( Like to decorate the walls of caustic soda, stone splash water) , cause local corrosion.
。 Stainless steel butterfly pneumatic valve in pollution in the air, Such as contains a lot of sulfur, oxidation of carbon, nitrogen oxide atmosphere) , encounter condensed water to form sulfuric acid, nitric acid, acetic acid, liquid, cause the corrosion. The above situation can be caused by the destruction of the stainless steel surface protective film cause corrosion.
in order to ensure that stainless steel does not rust advice must often to clean scrub of decorative stainless steel surface, remove attachments, eliminate the cause of external factors. Working condition of reasonable choice of suitable for their own use stainless steel material.