What are the surface treatment methods for Shield segment bolts?
Publish Time: 2024-07-01
As an important connector in underground projects such as subways and tunnels, the surface treatment of Shield segment bolts is crucial to improving the corrosion resistance, wear resistance and service life of bolts. The following are common surface treatment methods for Shield segment bolts:
Dacromet treatment: Dacromet treatment is an advanced bolt surface corrosion protection technology. It forms a dense protective film by coating a layer of Dacromet coating on the surface of the bolt, effectively isolating the contact between the bolt and the surrounding environment, thereby improving the corrosion resistance of the bolt. Dacromet coating not only has excellent corrosion resistance, but also has good wear resistance and high temperature resistance, and is suitable for Shield segment bolts in various harsh environments.
Hot-dip galvanizing: Hot-dip galvanizing is to immerse the bolt in molten zinc liquid, and the zinc liquid reacts chemically with the bolt surface to form a dense zinc-iron alloy layer. This treatment method can effectively prevent the corrosion of the bolt and increase the service life of the bolt. The surface of the bolt after hot-dip galvanizing is smooth and flat, and has good weather resistance and wear resistance.
Passivation treatment: Passivation treatment is to enhance the corrosion resistance of bolts by forming a passivation film on the surface of bolts. The passivation film can prevent the contact between bolts and the surrounding environment and reduce the corrosion rate. Passivation treatment is suitable for occasions with high requirements on the surface quality of bolts.
Electroplating treatment: Electroplating treatment is to plate a layer of metal or alloy on the surface of bolts to improve the corrosion resistance and wear resistance of bolts. Common electroplating layers include nickel, chromium, zinc, etc. The surface of bolts after electroplating is smooth, beautiful, and has good corrosion resistance.
In summary, there are many ways to treat the surface of shield segment bolts, each of which has its unique characteristics and scope of application. When choosing a surface treatment method, comprehensive consideration should be given to the specific engineering requirements and the use environment to ensure the reliability and durability of shield segment bolts.
