Why Does Stainless Steel Butterfly Valve Surface Rust?

Stainless steel butterfly valve can resist oxidation in the atmosphere, and has corrosion resistance in acid, alkali and salt medium, so all stainless steel butterfly valve has the characteristics of wear resistance and corrosion resistance. These characteristics can fully reflect the advantages of stainless steel material, but in some special environmental media, there is still the possibility of rust.
 

1) The surface of stainless steel butterfly valve adheres organic matter juice, such as melon, vegetable, noodle soup, etc. in the presence of water and oxygen, it forms organic acid, which will corrode the metal surface for a long time.

2) There are dust containing other metal elements or attachments of different metal particles on the surface of stainless steel butterfly valve. In the humid air, the condensation water between the attachments and stainless steel connects them into a micro battery, causing electrochemical reaction and damaging the protective film, which is called electrochemical corrosion.

3) Stainless steel butterfly valve surface adhesion contains acid, alkali, salt substances (such as decoration wall of alkali water, lime water splash), causing local corrosion.

4) Stainless steel butterfly valve in the polluted air (such as containing a lot of sulfide, carbon oxide, nitrogen oxide atmosphere), meet with condensate, form sulfuric acid, nitric acid, acetic acid liquid point, cause chemical corrosion.

The above conditions can cause the damage of the protective film on the surface of stainless steel and lead to corrosion.

In order to ensure that the stainless steel does not rust, it is suggested that the decorative stainless steel surface must be cleaned and scrubbed frequently to remove the attachment and eliminate the external factors causing the modification.