Study on Preparation and Application of Epoxy Wear-Resistant Insulating Anticorrosive Coatings
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摘要: 以双酚A树脂和腰果酚改性胺树脂为基料,添加氧化铝微粉、碳化硅、氧化铁红等耐磨防腐填料,通过试验室模拟加速试验测试,获得环氧耐磨绝缘防腐涂料。该涂料在碳钢表面附着力大于6 MPa;750 g/1 000 r条件下涂层表面磨蚀失重低于30 mg;涂层表面电阻率高于8.04×1010 Ω,绝缘性好;耐盐雾测试1 000 h后,3个样板涂层表面都未起泡、未锈蚀、未脱落;在0.01 Hz低频阻抗(|Z|0.01 Hz)条件下进行电化学交流阻抗值测试,经过1 000 h的耐盐雾性能测试后,其化学交流阻抗值由测试前的1.38×109 Ω·cm2下降为测试后的8.11×107 Ω·cm2以上,涂层具有较高的阻抗值和较好的保护性能,防腐性能良好。同时该涂料应用于嘉兴轻轨试验段轨道防腐绝缘防护,经测试该产品可使轨道电阻由裸轨的15 Ω·km增加到26.25 Ω·km,证明该产品绝缘性能优异。Abstract: 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.
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Keywords:
- light rail /
- high wear resistance /
- insulation /
- application
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