Generally speaking, the service life of subway rails can be guaranteed for at least fifteen years, but if the subway rails are corroded due to stray currents, they generally need to be replaced in more than one year.
The subway tunnel environment is complex and changeable. There are rainwater, groundwater, mud and other media, which can easily damage the insulation of the rail to the ground, resulting in stray current corrosion of the rail, which greatly shortens the service life of the rail and affects the safety of subway operations.
In March this year, the anti-stray current corrosion-resistant coated rail developed by ZJFB Advanced Material Technology Corporation was successfully applied in the Wuhan Metro project, realizing the first corrosion-resistant insulating rail using electrostatic insulating powder coating technology in China's rail transit field.
The corrosion problem of subway rails caused by stray current has been plaguing many urban subway groups in China. The replacement of steel rails can only be done late at night after the outage. The time is tight and the cost is high. Only 1 to 2 rails can be replaced each time. The track also needs to be calibrated.
In the continuous search for new materials and technologies, ZJFB's insulating powder electrostatic spraying technology has attracted the attention of China's largest rail manufacturer.
As China's leading technology and largest production capacity epoxy-coated steel bar manufacturer, ZJFB has been committed to popularizing the application of epoxy resin powder coating technology in special infrastructure fields such as steel bars.
The epoxy resin coating using electrostatic powder spraying is different from traditional brushing. Instead, the insulating powder with epoxy resin system content is used, using the principle of high-voltage electrostatic corona electric field, under the action of electrostatic force and compressed air, The powder is uniformly adsorbed on the steel substrate, sintered at high temperature, and solidified into a dense anti-corrosion protective coating.
Epoxy-coated steel bars not only have excellent performance and are suitable for various engineering requirements, but also can reduce the overhaul of buildings and prolong the service life of buildings.
As a leading company in the research and development of anti-corrosion materials in China, ZJFB also provides high-end anti-corrosion overall solutions such as duplex stainless steel rebars, extending the service life to more than 120 years.
"From the design of the insulating powder system to the temperature uniformity requirements in the heating process, the seemingly simple technical logic has many bottlenecks in the actual implementation process. Even if certain construction wear resistance is to be considered, the heating temperature cannot exceed 300 degrees, and each The temperature deviation of the inclination angle needs to be strictly controlled within 15 degrees Celsius.
After nearly 100 tests, the Chinese rail manufacturer and the R&D team of ZJFB have successfully developed a corrosion-resistant insulating rail that can prevent stray current. At present, the product has been applied to Wuhan Metro Line 2, and will be gradually extended to more subway lines in China in the later stage.