Industry knowledge
The fasteners, track bolts and other accessories of the railway are important components of the track. They are exposed to the natural environment for a long time, exposed to the sun and rain, wind and snow, and have poor working conditions. Rusted bolts will cause the bolts and connected fasteners, nuts, etc. to rust, making replacement and disassembly difficult, and will also reduce the force-bearing performance of the bolts, which may cause the fastening failure and breakage of the bolts, endangering the safety of train driving.
The atmospheric composition has a great influence on the corrosion rate. When there is salt spray, sulfur dioxide, hydrogen sulfide and dust in the atmosphere, the metal will react with it on the surface to generate corresponding compounds, causing chemical corrosion to varying degrees. If it encounters rain, electrochemical corrosion will also occur; in addition, corrosion from soil, organisms, etc. will also exist.
In addition, the action of force will also accelerate the corrosion of bolts. When the train is not passing, the fasteners will expand and contract, and will be subjected to lateral forces in the pulling or compression direction at different temperatures; when the train passes, it will be subjected to longitudinal forces in the up and down directions caused by the vibration of the train.
Whether on ballasted or ballastless railway tracks, bolts are subject to the forces caused by the thermal expansion and contraction of rails and the vibration of vehicles passing by. Therefore, bolt protection is not just a simple rust prevention, but also should prevent micro-wear corrosion caused by micro-vibration of bolts;
In addition, electric current will also aggravate the corrosion of bolts, especially the corrosion of bolts in the turnout area will also be affected by stray current. Compared with natural corrosion, stray current corrosion has the characteristics of accelerated corrosion and local concentration, which will accelerate electrochemical corrosion, which puts higher requirements on the protection of track bolts.
GNEE RAIL has a long-term customer base and good reputation in many countries, and its products are widely used in important engineering projects such as national railways, urban rails, and port transportation. We believe that continued high standards are the key to continuously improving brand value.
