Corrosion protection of bolt fasteners for engineering

Bolts, mechanical parts, cylindrical threaded fasteners with nuts. A type of fastener consisting of a head and a screw (a cylinder with external threads), which needs to be matched with a nut to securely connect two parts with through holes. This connection form is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection. There are many names for bolts, and everyone may have different names. Some people call them screws, some people call them bolts, and some people call them fasteners. Although there are so many names, the meaning is the same. They are all bolts. Bolt is a general term for fasteners. Bolt is a tool to tighten the parts of objects step by step by using the physical and mathematical principles of circular rotation and friction of objects. Bolts are indispensable in daily life and industrial production, and bolts are also called the rice of industry. It can be seen that bolts are widely used. Bolts are used in chemical enterprises, paper-making enterprises, rubber enterprises, petrochemical enterprises, water conservancy projects and even chemical experiments. Anyway, bolts are used in many places. Bolts play an important role in industry. As long as there is industry on the earth, the function of bolts will always be important. Anti-corrosion and anti-rust refers to the application of protective layer on metal surface by various methods, whose function is to isolate metal from corrosive environment, so as to inhibit the occurrence of corrosion process, or reduce the contact between corrosive medium and metal surface, so as to prevent or reduce corrosion. The protective layer shall meet the following requirements: 1, corrosion resistance, wear resistance, high hardness. 2. The structure is compact and complete, and the pores are small. 3, it is firmly combined with the base metal and has good adhesion. 4, evenly distributed and with a certain thickness. Before rust prevention, first clean up the rust and dust impurities on the bolts, which can be coated with hard film antirust oil, paint or Handicore polymer composite. In addition, it is necessary to avoid combining different metal materials with screws as much as possible, otherwise the screws will easily cause serious corrosion due to the difference of electrochemical potential energy between the two materials. Therefore, the most economical and effective anti-corrosion measures must be determined according to the reasons of screw corrosion, environmental conditions, anti-corrosion requirements, anti-corrosion effects of various measures, and cost and economic benefits, so as to achieve the purpose of anti-corrosion. Dilin 3850 wax colloid coating is similar to butter in appearance and usage, but it is different from butter in that it has excellent anticorrosion performance, dry outside and wet inside, never sagging at high temperature, and its surface is not sticky with ash and aging.