Will the stainless steel eyewasher rust?

Let's talk about why stainless steel eyewashers are not easy to rust, and then why stainless steel rusts. By saying that we will know if the stainless steel eyewash will rust.

Stainless steel does not easily rust and has a great relationship with the composition of stainless steel. In addition to iron, there are chromium, nickel, aluminum, and silicon. The chromium content of stainless steel in general is generally not less than 12%, even up to 18%. Adding chromium and other elements to the steel can change the properties of the steel. For example, the molecular structure of the steel is more uniform, and a dense oxide protective film is easily formed on the surface of the steel, which greatly improves the corrosion resistance of the stainless steel. Therefore, stainless steel can resist the corrosion of fire, water, acid, alkali and various solutions and does not rust. Scientists have discovered that the more homogeneous the internal structure of steel, the more closely the various components are linked, the more difficult it is for corrosion to invade, and the addition of an oxide protective film to the surface is similar to armoring steel, naturally. It is not easy to rust.

Why does a stainless steel eyewasher rust? When a brown rust (spot) appears on the surface of a stainless steel tube, people are surprised: "The stainless steel does not rust, and rust is not stainless steel. It may be a problem with the steel." . In fact, this is a one-sided misconception about the lack of understanding of stainless steel. Stainless steel will rust under certain conditions.

Stainless steel has the ability to resist atmospheric oxidation - that is, stainless, but also has the ability to resist corrosion in media containing acid, alkali, salt - that is, corrosion resistance. However, the corrosion resistance of the steel varies with the chemical composition of the steel itself, the interaction state, the conditions of use, and the type of environmental media. Such as 304 steel pipe, in the dry clean atmosphere, there is absolutely excellent resistance to corrosion, but it will be moved to the sea area, in the sea fog containing a lot of salt, will quickly rust; and 316 steel performance good. Therefore, not any kind of stainless steel can resist corrosion and rust in any environment.

Stainless steel is formed on the surface of a thin, strong and stable chromium-rich oxide film (protective film), to prevent the continued penetration of oxygen atoms, continue to oxidize, and get the ability to resist corrosion. Once for some reason, this kind of film is destroyed constantly, oxygen atoms in the air or liquid will continuously infiltrate or the iron atoms in the metal will continue to separate out to form loose iron oxides, and the metal surface will be continuously rusted. This type of surface film is damaged in many forms, and is common in daily life as follows:

1. The stainless steel surface contains deposits of dust or other dissimilar metal particles containing other metal elements. In humid air, the condensate between the deposit and the stainless steel is connected into a micro battery to initiate the electrochemical reaction. The protective film is damaged, which is called electrochemical corrosion.
2. The surface of the stainless steel adheres to organic matter juice (such as vegetables, noodles, soups, etc.). In the presence of water and oxygen, organic acids are formed, and organic acids attack the metal surface for a long time.
3. The surface of stainless steel adheres with acids, alkalis and salts (such as alkaline water on the wall of the decoration, lime water spray), causing localized corrosion.
4. In contaminated air (such as an atmosphere containing a large amount of sulfides, carbon oxides, and nitrogen oxides), condensation occurs, and sulfuric acid, nitric acid, and acetic acid liquids are formed, causing chemical corrosion.

Through the above introduction, we can understand whether the stainless steel eyewasher we use will rust.

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