日日av网,九九九九老司机,av男人天堂一区,国产制服日韩欧美,色婷婷二区,色999综合,在线视频不卡视频,国产日韩欧美精品一区,色婷婷一区二区三区四

How to deal with the problem of rust on screws assembled by screw manufacturers?

When brown rust spots appear on the surface of the combination screw, people are surprised: "The combination screw does not rust, and the rusted combination screw can be a problem with steel. In fact, this is a one-sided mistake that lacks an understanding of composite screws. Certain conditions for rust on combination screws.

The combination of screws and the ability to resist oxidation in the atmosphere - not rust, but also have the ability to withstand acid, alkali, and salt media, corrosion resistance - corrosion resistance. But its corrosion resistance steel has its own chemical composition size, increasing mutual status, utilization, and environmental medium types and changing conditions. Due to the excellent corrosion resistance of 304 steel pipe in a dry and clean atmosphere, it will be moved to the beach area with a large amount of salt and mist, which will quickly rust; And the good performance of 316 steel pipes. Therefore, there is no type of combination screw that has the ability to corrode and rust in any environment.

The combination screw is a thin layer of solid chromium rich oxide film (protective film) on the surface of the formation, which is stable to prevent the infiltration and oxidation of oxygen atoms, in order to obtain the ability to resist corrosion. Once for some reason, this thin film is constantly destroyed, air or liquid oxygen atoms will continue to infiltrate or metal iron atoms will form loose iron oxides from it, causing constant corrosion on the metal surface. Many of these surface membrane damage forms can be seen in daily life as follows:

The deposition of metal element dust or dissimilar metal particles on the surface of 1 combination screw, including attachments in humid air, condensation water, and adhesion between the combination screws, and the formation of two connected micro batteries, trigger an electrochemical reaction and damage the protective film, known as electrochemical corrosion.

Organic juices (such as vegetables, soup, and phlegm) on the surface of 2 combination screws form adhesion with organic acids in the presence of oxygen in water. Organic acids are long metal corroded surfaces.

Materials containing acids, alkalis, and salts 3. Adhesion to the surface of combination screws (such as alkaline water, lime water splashing on wall decoration), causing local corrosion.

4. In air pollution (such as containing a large amount of hydrogen sulfide, carbon dioxide, nitrogen oxide atmosphere), it meets the requirements of condensation water, forming sulfuric acid, nitric acid, acetic acid, liquid, and causing chemical corrosion.

The above conditions can cause damage to the protective film on the corroded surface of the combination screw. So, in order to ensure that the metal surface is permanently bright and cannot be corroded, we recommend:

1. Regularly clean and decorate the surface of the combination screws, remove attachments, and eliminate external factors that may cause corrections.

2. In coastal areas, 316 combination screws are used, and the 316 material can resist seawater corrosion.

3. Some chemical components of the combination screws in the market cannot meet the corresponding national standards and cannot meet the 304 material requirements. It can also cause rust, which requires users to carefully choose reputable manufacturers.