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Title:: Development of solvent-free epoxy coating for protection of transmission tower foot and Study on its anticorrosion performance

Author(s):: HU Jiayuan1; LI Yanwei1; LIU Shuan1; 2; CHEN Kefeng2; SUN Lisan2; QI Haojin3; FANG Yunhui3; ZHOU Kaihe3; ZHANG Hong4; (1.Zhejiang Electric Power Corporation Research Institute, Hangzhou 310014, China)
(2.Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China)

Keywords:: transmission tower; protective cap; corrosion; solventfree coating; silane coupling agent

Abstract:: The corrosion of transmission tower foot affected the safe running of the transmission line. The joint between main materials of the steel tower and the protective cap was easily corroded due to the environmental pollution and sedimentary water deposited from the protection cap. A kind of solventfree anti-corrosive epoxy coatings used for transmission tower foot protection was developed. These coatings owned the advantages of low viscosity, good leveling, and convenient construction. The corrosion performance of the solventfree coating was investigated by electrochemical test and salt spray test. The effect of silane coupling agent on the corrosion resistance and adhesion of the coating was also studied. Results indicated that the prepared solventfree anticorrosive epoxy coating exhibited good permeability and anticorrosion properties, and could be constructed in the presence of rust. When the solvent-free coating/concrete system was tested in a salt spray chamber for 2000 h, the coating was complete without foaming or peeling. The silane coupling agent KH560 not only improved the adhesion of the coating from 5.6 to 8.6 MPa but also effectively enhanced the flexibility and water resistance of the coating.