无溶剂环氧涂层在酸性溶液中对集输管道内壁的防腐性能

Anticorrosion Performance of Solvent Free Epoxy Coating on Inner Wall of Gathering and Transportation Pipeline in Acidic Solution

针对含二氧化碳酸性油气田集输管道内壁的严重腐蚀问题,采用自制的管道内涂层SLE-17进行内壁防护。通过对涂层的基础性能测试、耐化学性能测试、电化学测试以及腐蚀工况模拟试验,对涂层的适应性进行了评价研究。结果表明,该防腐涂料附着力为12.73 MPa,耐冲击性为55 kg·cm、经过30 d模拟高温高压腐蚀试验,附着力仍大于8 MPa,涂层外观完好,无气泡、开裂、剥落等涂层失效情况。对其进行电化学阻抗测试和抗阴极剥离测试,其阻抗值为1.1×109Ω·cm2,抗阴极剥离半径为2.9 mm,涂层仍能有效阻止腐蚀物质渗透到金属基体,具有良好的适应性。

The problem of serious corrosion of the inner wall of acid oil and gas field gathering and transportation pipeline containing carbon dioxide is discussed,the self-made inner coating of pipeline SLE-17 was used to protect the inner wall.The adaptability of the coating was evaluated by basic performance test,chemical resistance test,electrochemical test and corrosion condition simulation test.The results show that the adhesion of the anticorrosive coating is 12.73 MPa,the impact resistance is 55 kg·cm,after 30 days of simulated high temperature and high pressure corrosion test,The adhesion is still greater than 8 MPa the coating appearance is intact,no bubbles,cracking,peeling and other coating failure.On the electrochemical impedance test and cathodic disbonding resistance test,the impedance value of1.1×109Ω·cm2,radius of cathodic disbonding resistance is 2.9 mm,coating can effectively prevent corrosion penetration to the metal substrate,has good adaptability.