Transmission line towers with voltage levels exceeding 1000 kV in China are listed as the key development direction for the country's continuous improvement of high transmission capacity and long-distance power transmission in the future;State Grid Corporation of China has put forward technical requirements for hot-dip galvanizing coatings on steel components of iron towers.In order to meet these requirements,this article focuses on the impact of high silicon and phosphorus elements on the quality of hot-dip galvanizing in Q420 C steel in terms of hot-dip galvanizing process and management.Measures such as low-temperature galvanizing,adding aluminum,nickel rare earth alloys to the zinc solution,etc.are adopted;Innovations have been made in acid pickling,solvent assisted plating parameters,zinc liquid purification,and chromium free passivation;Through production practice,it has been shown that the new process management adopted can meet the quality requirements of hot-dip galvanizing for ultra-high voltage iron towers and components,as well as the relevant requirements of the DL/T5300 and DL/T5236 evaluation regulations of the State Grid.
ultra-high voltage iron towerhot dip galvanizing processstandardized operationsurface quality
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