What is the solution to stainless steel rust?
The reason why stainless steel is not easy to rust is because stainless steel contains chromium, nickel, molybdenum and other elements, after the steel body has these elements, the internal molecular structure becomes more uniform, the surface of the steel body will also produce a layer of dense chromium-rich oxide protective film, which greatly increases the corrosion resistance of the steel body, so it can be in very
First, analysis of the reason why stainless steel surface will also produce rust
The reason why stainless steel is not easy to rust is because stainless steel contains chromium, nickel, molybdenum and other elements, after the steel body has these elements, the internal molecular structure becomes more uniform, the surface of the steel body will also produce a layer of dense chromium-rich oxide protective film, which greatly increases the corrosion resistance of the steel body, so it can greatly resist the erosion of external acid goods.
However, if the surface layer of the stainless steel body is damaged or retains some acid, alkali and other metal particulate matter, and is exposed in the air for a long time, some rust will also be produced, the main reasons for this phenomenon are as follows:
1, stainless steel surface adhesion contains acid, alkali, salt substances (such as decoration walls of alkali water, lime water splashing, welding slag sputtering point, grinding slag, etc.), causing local corrosion.
2. Dust or metal particle attachments containing other metal elements are deposited on the surface of stainless steel, and after these attachments encounter water in the air, the two will be connected into a microbattery, which causes an electrochemical reaction and destroys the chromium-rich oxide protective film on the surface of stainless steel, resulting in rust.
3, stainless steel surface adhesion organic juice (such as melons and vegetables, noodle soup, sputum, hand sweat, etc.), in the case of water oxygen, constitute organic acid, long-term organic acid corrosion on the metal surface.
4, in the polluted air (such as containing a large number of sulfide, carbon oxide, nitrogen oxide atmosphere), in the case of condensate, the formation of sulfuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.
5, stainless steel surface treatment processing process polishing material contains iron ions, factory cleaning is not clean on the surface of the product, after encountering water in the air for a long time will produce rust spots.
The above phenomena are the local corrosion of the stainless steel surface, the time is not long will not form deep damage to the stainless steel, you can use a cleaning cloth with a small amount of stainless steel cleaning liquid to wipe clean, external use of a small amount of passivation liquid coated evenly can protect the stainless steel surface will no longer appear rust phenomenon.
Second, surface rust treatment methods and cleaning points
1. When cleaning liquid is used to remove pollution and rust, please do a local "test wipe" in advance to confirm the cleaning effect. If the test results are satisfactory, then do comprehensive cleaning according to this method. And cleaning do not only pollute the rusty part, as far as possible even the surrounding part also do cleaning. If you do not do so, the luster of the stainless steel surface will be uneven, and the appearance will be ugly.
2. After using the cleaning liquid, the cleaning liquid must be completely washed with clean water, and the liquid must not remain on the stainless steel surface, otherwise it will cause secondary rust.
3. When using cleaning equipment, it must be cleaned along the stainless steel grinding since parallel. If you do circular cleaning, the pollution is not easy to remove, and will damage the surface luster.
4. For steel cleaning appliances or sandpaper, etc., although it can remove serious pollution, it is usually absolutely prohibited to use, because it will damage the stainless steel surface, and the fine iron powder remaining on the stainless steel surface after use is easier to rust the stainless steel surface again.
