Today, a customer called to ask why the stainless steel screws also rusted. The phone said that the stainless steel combination screws they purchased before had rusted during the salt spray test, and strongly suspected that they had bought fake stainless steel screws.
Ski shoes combination screws
Stainless steel screws have better properties, stronger corrosion resistance, high temperature resistance, and strong anti-rust properties. However, it will still rust in harsh environments. For example, in the case of very moist stainless steel screws, daily sun shower, wind and rain. For a long time, how many will surely give birth to rust. For example, in contact with some of the acid-base chemicals, chemical reactions occur. Causes corrosion to rust. There is a stainless steel screw which is not good, for example, stainless steel SUS201 screw used in seawater products, due to constant-time soaking, originally SUS201 stainless steel screw itself is not suitable for use in salt water strong above. Causes corrosion to rust. In the use of seawater products, it is generally recommended to use stainless steel SUS316 screws, because 316 stainless steel screw corrosion and other properties are better.
Stainless steel ski shoe combination screw
When the brown rust (spots) appear on the surface of the stainless steel tube, people are greatly surprised: "Stainless steel is not rusted, rust is not stainless steel, and there 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 screws have the ability to resist atmospheric oxidation - that is, stainless, but also have the ability to corrosion in media containing acid, alkali, and salt - that is, corrosion resistance. However, the corrosion resistance of the steel varies with the chemical composition of the steel itself, the inter-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 screws rely on its surface to form a thin, strong and stable, chromium-rich oxide film (protective film) to prevent oxygen atoms from continuing to infiltrate and continue to oxidize, resulting in the ability to resist rust. Once for some reason, the film is continuously destroyed, air or liquid oxygen atoms will continue to 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 subject to destruction in many forms, and is commonly seen in daily life as follows:
Stainless steel pot
1. The surface of stainless steel screws contains deposits of dust or other dissimilar metal particles containing other metal elements. In moist air, the condensed water between the deposits and stainless steel is connected into a micro battery, causing electrochemistry. Reaction, the protective film is destroyed, known as electrochemical corrosion.
2. The surface of stainless steel adheres to the organic matter juice (such as melon vegetables, noodles, soup, 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 the stainless steel adheres with acids, alkalis, and salts (such as alkaline water and gray water splashes on the wall), 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.
Ski shoes hardware accessories
The above conditions can cause the corrosion of stainless steel screw surface protection film to cause corrosion. Therefore, to ensure that the metal surface is permanently bright and not rusted, we recommend:
1. The surface of the decorative stainless steel must be cleaned and scrubbed frequently to remove attachments and eliminate the external factors that cause the modification.
2. The sea area uses 316 stainless steel and 316 is resistant to seawater corrosion.
3. The chemical composition of some stainless steel pipes on the market cannot meet the corresponding national standards and cannot meet the 304 material requirements. It can also cause rust, which requires the user to carefully select products from reputable manufacturers. Jinchenda screw stainless steel screw quality assurance, quality and cheap!