track fasteners have a variety of anti-corrosion treatment methods, and according to different application scenarios and needs, the following main anti-corrosion technologies can be selected:
1. Powder zincizing technology
Powder zincizing is an advanced anti-corrosion process of thermal diffusion coating on metal surface, which has excellent corrosion resistance, wear resistance and impact resistance. This technology significantly improves corrosion resistance by forming a uniform zinc coating on the surface of fasteners, which is suitable for railways, rail transit, Bridges and other fields.
2. Multi-component alloy penetration technology
Through shot blasting, zinc-aluminum alloy spraying, infiltration heating, sealing layer coating and heat preservation curing, high corrosion resistance, wear resistance and high strength anticorrosive coating are formed. Its advantages include no need to vacuum, low cost, strong binding force, while not changing the properties of the base metal.
3. Dacromet coating technology
Dacromet coating is an environmentally friendly surface treatment process, through the formation of inorganic conversion film coating containing zinc, aluminum and chromium on the surface of the metal, to enhance the corrosion resistance. However, when the dacromet coating is used in combination with stainless steel bolts, the potential difference may accelerate galvanic corrosion, resulting in rust of the lock washer.
4. Electric galvanizing and hot dip galvanizing
Electrogalvanizing and hot-dip galvanizing are common anticorrosive treatment methods, suitable for fasteners exposed to the outdoors for a long time. Electrogalvanizing cost is low, but it is easy to produce hydrogen embrittlement. Hot-dip galvanizing is more expensive, but can provide better anti-corrosion effect.
5. Apply anticorrosive paint
Including the use of anti-rust wax, silicone sealant and other materials to coat the fasteners. This method is simple and easy to do, but requires regular maintenance, such as reoiling every two to three years.
6. Mechanical hot plating and surface passivation
Mechanical hot plating forms a protective layer by cold soldering particles onto the fastener surface, while surface passivation enhances corrosion resistance by increasing hardness and reducing oxidation phenomena.
7. Zinc-nickel infiltration treatment
This method improves the corrosion resistance of fasteners by forming a zinc-nickel infiltration layer on the surface. It is suitable for high strength fasteners such as railway elastic bar.
8. Electrophoresis spray paint
Electrophoretic spray paint is an environmentally friendly coating technology, which forms a uniform film by electrophoretic deposition. It has good anti-corrosion effect, but the cost is high.
9. Alloy atomic infiltration surface treatment
This technology improves corrosion resistance and service life of fasteners by forming an alloy layer on their surface. Suitable for high strength fasteners such as railway fasteners.
10. Special coating technology (e.g. Teflon coating)
Teflon coatings have excellent corrosion resistance and low coefficient of friction for situations where friction needs to be reduced or loosening prevented.
Note:
When selecting the anti-corrosion treatment method, it is necessary to consider the working environment of the fastener (such as humidity, salt spray, acid rain, etc.) and the material characteristics (such as stainless steel or carbon steel).
– For stainless steel fasteners, dacromet coating and zinc-nickelizing treatment are recommended choices.
After anti-corrosion treatment, follow-up protection measures such as rust removal and oiling should be carried out to extend the service life of fasteners.
In summary, the anti-corrosion treatment method of track fasteners should be selected according to the specific application scenario and environmental conditions to ensure its long-term stable operation.
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