Will stainless steel butterfly valves also rust? Is there a problem with the material?

When a customer buys stainless steel butterfly valves, the Bundor Valve’s salesman usually inquires about the medium and usage environment in the pipeline in detail, in order to avoid the rust of the stainless steel butterfly valves caused by the selection of the wrong stainless steel material, which will affect the project operation occur.
Stainless steel butterfly valves are favored by countless valve buyers for their beautiful appearance, corrosion-resistant characteristics, and the advantages of not being easily damaged.

But when brown rust spots appear on stainless steel butterfly valves, many people will be surprised: why does "stainless steel" also rust? Is it still "stainless steel" if it rusts? Is there a problem with the material?
In fact, stainless steel butterfly valves are not completely rust-proof, and will rust under certain conditions. Stainless steel butterfly valves are based on a very thin, strong, dense and stable chromium-rich oxide film (protective film) formed on its surface to prevent the oxygen atoms from continuing to infiltrate and oxidize to obtain the ability to resist corrosion. When this surface film is damaged, oxidation and rust will occur. The 304 stainless steel butterfly valves have absolutely excellent corrosion resistance in a dry and clean atmosphere, they are moved to the seaside area and will soon rust in the sea fog containing a lot of salt; and 316 material perform well.
Therefore, it is not any kind of stainless steel butterfly valves, which can resist corrosion and rust in any environment. Stainless steel rust often appears in the following situations in daily life:
1. The surface of the stainless steel butterfly valves accumulate dust or other metal particles containing other metal elements. In humid air, the condensate between the attachment and the stainless steel butterfly valves connect the two into a micro battery, which causes electricity. The chemical reaction damages the protective film, which is called electrochemical corrosion.
2. Organic matter juice adheres to the surface of the stainless steel butterfly valves, which forms an organic acid in the presence of water and oxygen, and the organic acid will corrode the metal surface for a long time.
3. The surface of the stainless steel butterfly valves contains acids, alkalis and salts, causing local corrosion.
4. In contaminated air, when it encounters condensed water, it forms sulfuric acid, nitric acid, and acetic acid liquid spots, causing chemical corrosion.
The above conditions can cause damage to the protective film on the surface of stainless steel butterfly valves and cause corrosion. Therefore, in order to ensure that the metal surface is permanently bright and not rusted, Bundor Valve recommends:
1. Regularly clean and clean the surface of stainless steel butterfly valves, remove the debris and attachments on the surface, and avoid various external factors that cause rust.
2.316 stainless steel butterfly valves have the ability to resist seawater corrosion. Therefore, Bundor Valve recommends that the 316 material is selected when selecting stainless steel butterfly valves for projects in the seaside area.
3. Choose valve products produced by credible and reliable manufacturers. The stainless steel chemical composition of inferior stainless steel butterfly valves can not meet the requirements of 304 material in national standards, so rust often occurs.
Bundor Valves has complete production qualifications and is a high-quality water system valve supplier with a two-year warranty. You can safely buy any of our valves！The official website of Bundor Valve is www.bundorusa.com，welcome to enter the website to learn about the product!