Affected by the environment, the destructive damage caused by chemical or electrochemical reactions, called corrosion, almost all metal products, in certain environments, there will be several types of corrosion, and the screws are metal products. Naturally, the problem of metal corrosion cannot be avoided. When the environment and time of use are different, the corrosion phenomenon is also significantly different. There are many polluting industries, such as steel, petrochemical, thermal power generation, etc. In addition, in recent years, steam and locomotives have grown substantially, and a large amount of exhaust gas has been emitted, which has filled the air with corrosive sulfides and nitride gases and particles. The main cause of metal corrosion.
Metal corrosion can result in significant equipment maintenance costs and severe economic losses, such as increased design, manufacturing, maintenance and repair costs due to corrosion, or even hazards and disasters. Screws have the widest range of applications and the largest quantity requirements. The durability of their corrosion resistance determines the durability of their use and has a significant impact on the safety and reliability of equipment. Therefore, research on anti-corrosion methods, development and application of modern anti-corrosion technology Is an important topic at present.
Anti-corrosion method
There are four main methods for metal corrosion protection, namely, controlling the material itself, the use environment, the interface between materials and the environment, and the design of the improved metal structure. If a fully corrosion-resistant alloy is used to manufacture the screw, unless there is a special need, the economic point of view In fact, it is impractical, or the surface of the screw is completely isolated from environmental factors that may cause corrosion, and it may not be feasible in practice, which may be very difficult. The improved metal structure design can improve the influence of special circumstances under certain circumstances, but most of the screw design cannot be fully modified, and its protection is not permanent. Therefore, this method cannot solve the problem fundamentally, only the corrosion protection at the interface. That is, surface anti-corrosion treatment is currently the most widely used method.
Surface anti-corrosion treatment refers to the application of a protective layer on the metal surface by various methods. The function of the surface is to isolate the metal from the corrosive environment, to inhibit the occurrence of the corrosion process, or to reduce the contact between the corrosive medium and the metal surface to prevent or Reduce the purpose of corrosion. The protective layer should meet the following requirements: 1. Corrosion resistance, wear resistance, high hardness, 2. Tight structure, completeness, small pores, 3. Strong bonding with the base metal, good adhesion, 4. Uniform distribution and certain thickness. The protective layer is generally divided into two types: a metal coating and a non-metal coating. The metal coating refers to forming a protective layer on a metal surface which is easily corroded by a metal or alloy having high corrosion resistance, and the coating is also called a plating layer. There are quite a number of methods and types of metal plating, the most common of which is electroplating, followed by molten metal immersion (hot dip) and chemical surface treatment.
Non-metallic coating refers to the formation of a protective layer on the surface of metal equipment or parts by using organic polymer materials such as paints and inorganic materials such as ceramics . The protective layer can completely isolate the base metal from the environmental medium and prevent the base metal from being corroded by contact. Corrosion caused by the media.
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Label: anti-corrosion treatment of screws: anti-corrosion method
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Meat product lighting is a lighting solution specifically designed for the environment in which meat products are displayed and sold. It aims to highlight and accentuate the texture, color, and freshness of meat products by providing appropriate lighting to attract customer's attention and boost sales.
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