Under normal current conditions, the subway rails coated with anti-corrosion epoxy resin can increase the service life by at least 5 times.
On April 26, 2021, WHGT Advanced Materials Technology Corporation and China Rail Steel Group jointly developed China's first anti-corrosion resin coating material for subway rails, and has received orders from many Chinese subway companies.
The subway has become one of the important means of transportation for people in the city. Generally speaking, the service life of subway rails is more than ten years. However, if the subway rails corroded due to stray currents are generally replaced in more than one year.
Since the direct current used in the subway conducts electricity through the rails, the current flows in one direction. If the rails cannot be insulated from the ground in a humid environment, and the current flows to the ground, it is easy to cause the rails to rapidly corrode and break, bringing safety hazards.
The new resin coating material melts the powdered resin material at a high temperature of 300 ° C and sprays it on the waist and bottom of the subway rail. "The resin coating material, in addition to its insulating effect, can also reduce the oxidation of the rail in the normal atmosphere. process".
This new type of coating material has been applied to rails in Wuhan and Shanghai, and will be gradually promoted in the later stage.