Stainless steel butterfly valve relies on a very thin, firm and stable chromium-rich oxide film (protective film) formed on its surface to prevent the continuous infiltration and oxidation of oxygen atoms and obtain the ability to resist rust.

Stainless steel butterfly valve can resist oxidation in the atmosphere and has corrosion resistance in the medium of acid, alkali and salt, so the all stainless steel butterfly valve has the characteristics of wear resistance and corrosion resistance. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media.

These characteristics can fully reflect the advantages of stainless steel material, but there is still the possibility of rust in some special environmental media. The following VALTECCN butterfly valve suppliers introduce several rust situations:

1. Organic juices (such as vegetables, soup, sputum, etc.) adhere to the surface of the stainless steel butterfly valve. In the presence of water and oxygen, organic acids are formed, and organic acids will corrode the metal surface for a long time.
2. On the surface of the stainless steel butterfly valve, there are deposits of dust or heterogeneous metal particles containing other metal elements. In the humid air, the condensed water between the deposits and the stainless steel connects the two into a micro-battery, which triggers electrochemical reactions. Reaction, the protective film is destroyed, called electrochemical corrosion.
3. The surface of the stainless steel butterfly valve contains acid, alkali and salt substances (such as alkali water and lime water splashing on the decoration wall), causing local corrosion.
4. In the polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide and nitrogen oxide), when encountering condensed water, it will form liquid points of sulfuric acid, nitric acid and acetic acid, causing chemical corrosion. The above conditions can cause damage to the protective film on the stainless steel surface and cause rust.

In order to ensure that stainless steel does not rust, it is recommended that the surface of decorative stainless steel must be cleaned and scrubbed frequently to remove attachments and eliminate external factors that cause modification. Reasonably choose the stainless steel material suitable for your working conditions.

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