How to choose the type of anti-corrosion layer on the surface of cable tray

The third common problem in engineering design is that the type of cable tray is not marked with the type of anti-corrosion layer, and there is no unified text description. This problem has lessons in reality. For example, in a project in Indonesia that my country undertakes the general contract, the surface anti-corrosion treatment of the steel cable tray has not been subjected to salt spray tests. Soon after the completion of the bridge, the corrosion is quite serious and has to be replaced. The surface anti-corrosion layers of cable trays mainly include hot-dip galvanizing, galvanized nickel, cold galvanizing, powder electrostatic spraying, etc. According to the manufacturer's data, the service life of hot-dip galvanizing process is not less than 40 years, which is suitable for outdoor heavy corrosive environments. High; the life of galvanized nickel process is not less than 30 years, and it is also suitable for outdoor heavy corrosive environment, and the cost is high; the life of cold galvanizing process is not less than 12 years, suitable for outdoor light corrosive environment, and the cost is average; the life of powder electrostatic spraying process is not less than 12 years, suitable for indoor dry environment at room temperature, the price is average. The designer should reasonably select the type of surface anti-corrosion layer of the cable tray according to the engineering environmental conditions, and express it clearly in the design documents.