For stainless steel, I believe everyone will not be unfamiliar. Stainless steel is used in food, medical, scientific research and other fields for its excellent corrosion resistance, formability, compatibility and toughness . However, the mention of stainless steel only indicates that it has high-strength corrosion resistance, and its corrosion resistance varies with the chemical composition of the steel itself, the processing state, the conditions of use, and the type of environmental medium. For example, 304 stainless steel has absolutely excellent rust resistance in a dry and clean atmosphere, but it is moved to the seaside area, and in the sea fog containing a lot of salt, it will soon rust; while 316 stainless steel will perform. good. Therefore, it is not any kind of stainless steel and can rust without any environment.

Stainless steel 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 for some reason, the film is continually destroyed, oxygen atoms in the air or liquid will continue to infiltrate or iron atoms in the metal will be continuously separated, forming loose iron oxide, and the metal surface will be continuously rusted. If the medium in contact with stainless steel is rich in chloride ions, the stainless steel will undergo stress corrosion, pitting corrosion and intergranular corrosion, which will aggravate the rust of stainless steel.
The surface of the stainless steel adheres to the organic juice, which forms an organic acid in the presence of water and oxygen. The organic acid will corrode the metal surface for a long time.
In polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, nitrogen oxide), in the case of condensed water, sulfuric acid, nitric acid, acetic acid liquid point is formed, causing chemical corrosion.
Germany WIGGENS ultra-fine grinding machine, in order to ensure the high strength and heat resistance of its cutter head and screen, it chose the German origin of 1.4034 Martens stainless steel. The mechanical properties can be adjusted by heat treatment. When it is used for a short time or a long time under the working conditions of high temperature medium of more than 550 °C, the steel with good mechanical properties can still be made of heat-resistant steel, depending on the alloy content (Al, Cr, Ni), the maximum operating temperature can reach 1150 °C. Under the premise of ensuring the strength, the corrosion resistance effect may not be superior to the Aussie stainless steel S316. Therefore, when the sample is processed, the experimenter needs to clean it in time, and directly dry it after washing to effectively protect the stainless steel cutter head and the screen to prevent rust.

WIGGENS ultrafine grinding machine