Does steel pipe really not rust?
Steel pipe is a situation in which the use of steel pipe is relatively large. An important feature of steel pipe is that, because the steel pipe is widely used in many fields, especially it does not rust, it is the reason why people are more optimistic. Steel pipe is not rusted in the principle of processing and production, but it is rusted in real life, why? We are a professional manufacturer of steel pipes. Let us introduce this problem to you:
1. Many people think that steel pipes will not rust, which is a one-sided view of the wrong. First of all, the steel pipe rust and corrosion resistance is conditional. The steel pipe should be free from rust in the atmosphere, fresh water and other weak corrosion environment, and the chromium content of the steel must be ≥12%. Rust will occur if the chromium content is low or is not used in a weak corrosive environment such as atmosphere (including Cl- local rich collection concentration conditions although in a weak corrosive environment such as atmosphere). Acid-resistant steel pipes are corrosion-resistant steel pipes in acid, alkali, salt and other strong corrosive media, but they are also corrosion-resistant under certain conditions, such as the type of media, temperature, concentration, impurity content, flow rate, pressure and so on. There is no steel pipe in the world that is resistant to rust and corrosion under any conditions.
2, the surface of the steel pipe contains other metal elements of the dust or the attachment of heterogeneous metal particles, in the humid air, the attachment and the condensed water between the steel pipe, the two will be connected into a micro battery, triggering an electrochemical reaction, protective film is damaged, called electrochemical corrosion.
3. The surface of the steel pipe is adhered to organic juices (such as melons and vegetables, noodle soup and phlegm, etc.). In the case of water oxygen, organic acids are formed, and organic acids are corroded on the metal surface for a long time.
4, steel pipe surface adhesion containing acid, alkali, salt substances (such as the decoration of the wall of alkali water, limestone water spray test) cause local corrosion.
5, in the polluted air (containing a large number of sulfide, oxide, hydrogen oxide atmosphere), in the case of condensation water, the formation of nitric acid, acetic acid liquid point, causing chemical corrosion.
