Study on Preparation and Application of Epoxy Wear-Resistant Insulating Anticorrosive Coatings

The epoxy wear-resistant insulating anticorrosive coating is prepared by the laboratory simulation accelerating test with the bisphenol A resin and cardanol modified amine resin as the base material and alumina powder, silicon carbide, iron oxide red and other wear-resistant anticorrosive as fillers. The surface adhesion of the coating on carbon steel is more than 6 MPa. Under the condition of 750 g/1000 r, the abrasive weight loss of the coating surface is less than 30 mg. The coating has good insulation, the surface resistivity higher than 8.04×10¹⁰ Ω. After 1 000 h of salt spray test, the coating on the three plates has no blisters, rust and peeling off. The electrochemical impedance value test is carried out under the condition of 0.01 Hz low frequency impedance (|Z|0.01 Hz), and the electrochemical impedance value of the coating drops from 1.38×10⁹ Ω·cm² before the salt spray resistance test to above 8.11×10⁷ Ω·cm² after the test, showing that the coating has high impedance value and good protection performance. Besides, the coating is applied into the track anti-corrosion insulation protection of the test section of Jiaxing light rail, and the impedance value of the track with coating is 26.25 Ω·km while that of the track with no coating is 15 Ω·km, improving that coating has excellent insulation performance.