Commonly used anti-corrosion technologies for rails are as follows:
Coating anti-corrosion technology
Paint coating: This is a more traditional and common coating anti-corrosion method. Apply the paint evenly on the surface of the rail to form a protective film, which can effectively isolate the rail from the outside air, moisture and other corrosive substances, thereby slowing down the corrosion rate of the rail. Paint coating has the advantages of low cost and relatively simple construction, but its durability is relatively poor. It is easy to peel off and fade during long-term use, and needs regular maintenance and repainting.
Metal plating anti-corrosion technology
Electroplating: Using the principle of electrolysis, a metal protective film is plated on the surface of the rail, such as cadmium plating, nickel plating, etc. The electroplating layer can provide good corrosion resistance and decorativeness, and the thickness and performance of the coating can be controlled as needed. The electroplating process is relatively mature and the production efficiency is high, but a certain amount of wastewater and waste gas will be generated during the electroplating process, which needs to be strictly treated to avoid pollution to the environment.
Anti-corrosion additive technology
Adding alloy elements to rail materials: By adding some specific alloy elements, such as chromium, nickel, molybdenum, etc., to rail steel, the corrosion resistance of the rail can be improved. These alloy elements can form a dense oxide film on the surface of the rail to prevent further intrusion of corrosive media. For example, stainless steel rails with a high chromium content have good corrosion resistance and oxidation resistance, and are suitable for some special occasions with high anti-corrosion requirements, such as tunnels and coastal areas.