China butterfly valve - butterfly valve body rust causes

Author:China butterfly valve     Published time:2019-08-19 08:56     Reading times:281    

China butterfly valve is the global butterfly valve manufacturing base. Today, the butterfly valve manufacturer TJL Group introduces you to the cause of the rust of the butterfly valve body. The stainless steel butterfly valve is a very thin and strong and stable chromium-rich oxide film (protective film) formed on the surface to prevent the oxygen atoms from continuing to infiltrate and continue to oxidize, thereby obtaining the ability to resist rust.


Once the butterfly valve body has some reason, the film is continuously destroyed, the oxygen atoms in the air or liquid will continuously infiltrate or the iron atoms in the metal will be continuously separated, forming loose iron oxide, and the metal surface will be continuously Ground rust.


Advantages of China stainless steel butterfly valve: stainless steel butterfly valve can resist oxidation in the atmosphere, has corrosion resistance in acid, alkali and salt medium, so all stainless steel butterfly valve has wear and corrosion resistance.


The characteristics of the china butterfly valve can fully reflect the advantages of stainless steel material, but there are still some rusting possibilities in some special environmental media. Here are a few:


1. The surface of the stainless steel butterfly valve adheres to the organic juice (such as melon, noodle soup, glutinous rice, etc.), and in the case of water and oxygen, constitutes an organic acid, and the organic acid corrodes the metal surface for a long time.


2. The surface of the stainless steel butterfly valve contains dust or other metal particles attached to other metal elements. In the humid air, the condensed water between the attached material and the stainless steel connects the two into a micro battery, triggering the electrochemical In response, the protective film is destroyed, which is called electrochemical corrosion.


3. The surface of the stainless steel butterfly valve adheres to acid, alkali and salt substances (such as alkali water and lime water splashing on the wall), causing local corrosion.


4. Stainless steel butterfly valve in the polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, nitrogen oxide), in the case of condensed water, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion. All of the above can cause the corrosion of the stainless steel surface protective film to cause rust.


In order to ensure that stainless steel does not rust, it is recommended that the decorative stainless steel surface should be cleaned and scrubbed frequently to remove the deposits and eliminate external factors that cause modification. Reasonable choice of stainless steel for working conditions.


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