The Principle Of 3LPE Coated Pipes Corrosion Resistance And Corrosion Resistance

The rusting of steel in the atmosphere is the corrosion of iron by ionization to form unprotected iron oxides (rust), while the stainless steel of 3LPE Coated Pipes is also a corrosion phenomenon, the difference is in the atmosphere, The ionization of iron and chromium in stainless steel results in a protective chromium-rich oxide (passivation film), the difference between which is only the nature of the chemical reaction product.

It is believed that the rust of steel in the atmosphere is severely corroded, while the DIN17175 Seamless Steel Pipe is stainless because the stainless steel does not corrode, which is visible to the naked eye with the reddish brown rust formed on the steel surface, while the stainless steel surface forms a thin layer of passivation. The film is colorless and transparent, and the naked eye is not visible. What people can see is only the misunderstanding of the beautiful metal surface under the passivation film.

It is conceivable that if the passivation film on the surface of 304 stainless steel tube is not colorless or transparent, what will be the result? The stainless steel tube stainless steel is determined by the chromium content in the steel (the steel contains enough chromium to ensure the surface). The formation of a chromium-rich oxide film, so the higher the chromium content, the better the corrosion resistance of stainless steel, and it has nothing to do with the magnetic properties of the stainless steel tube. There is no stainless steel tube without chromium. Numerous studies and practices at home and abroad have shown that chromium is the only element that can passivate steel and impart stainless steel, corrosion resistance and industrial value. The so-called chromium-free stainless steel tube does not exist. The only characteristic of stainless steel pipes is that they do not produce rust (ie, rust) in the atmosphere and fresh water, and are distinguished from steel that is corrosion-resistant but rust-prone in the atmosphere, fresh water, and acids, alkalis, and salts.