Anti-corrosion Treatment and Durability Improvement for Fastening Systems
- What are the common anti - corrosion treatment methods for fastening systems?
Hot - dip galvanizing is a common method. The components of the fastening system are immersed in molten zinc liquid to form a zinc layer on the surface. The thickness of the zinc layer is generally 80 - 120μm, which can effectively isolate air and moisture and prevent the components from rusting. It is suitable for bolts, nuts, etc. There is also electro - galvanizing, in which a zinc layer is deposited on the surface of the components through the electrolysis principle. The zinc layer is relatively thin, about 10 - 30μm, and the cost is relatively low. In addition, anti - corrosion paint such as zinc - rich paint and epoxy paint can be applied. Different paint types can be selected according to the environment. In harsh environments, multiple layers of paint can be applied to enhance the anti - corrosion effect.
- How do different anti - corrosion treatment methods affect the performance of the fastening system?
The hot - dip galvanized layer is relatively thick and has good protection performance, but it may increase the size of the components. For some high - precision fastening systems, the thickness of the galvanized layer needs to be controlled to avoid affecting the assembly accuracy. The electro - galvanized layer is thin and has little impact on the size, but its protection ability is relatively weak. Coating anti - corrosion paint can provide certain protection, and different colors and lusters can be selected according to needs. However, the paint layer may be damaged due to external impact and wear, reducing the anti - corrosion performance.
- How to select the appropriate anti - corrosion treatment method for the fastening system according to the use environment?
In humid, coastal and other easily corroded environments, hot - dip galvanizing is preferred. Its good protection performance can resist corrosion for a long time. In indoor or less corrosive environments, electro - galvanizing or coating ordinary anti - corrosion paint can meet the needs and reduce costs. For special requirements, such as railways for food transportation, the environmental protection of the anti - corrosion paint needs to be considered, and paint types that meet relevant standards should be selected.
- What are the precautions for the maintenance of the anti - corrosion treated fastening system?
Regularly check the integrity of the anti - corrosion layer. For example, whether the hot - dip galvanized layer has fallen off or peeled, and whether the anti - corrosion paint layer has cracked or peeled. Repair the problems in time. For small - area damage to the galvanized layer, zinc - rich paint can be used for repair; for damaged paint layers, repaint. Also, pay attention to cleaning to prevent the accumulation of dust and dirt, which can accelerate corrosion. After severe weather, such as heavy rain and sandstorms, check and maintain in time.
- What is the relationship between the durability of the fastening system and anti - corrosion treatment?
Effective anti - corrosion treatment can significantly improve the durability of the fastening system. Without anti - corrosion treatment, the fastening system in a corrosive environment is prone to problems such as bolt rusting and nut seizure, reducing the connection strength and shortening the service life. After good anti - corrosion treatment, such as hot - dip galvanizing combined with painting, the fastening system can maintain good performance for 15-20 years in harsh environments, ensuring the long - term stable operation of railways.