特种聚酰亚胺作为油田管材涂层的性能评价

为了研究一种高性能聚酰亚胺作为油田管道防腐涂层的防腐效果,通过击穿电压测试、溶液浸泡测试、耐高温高压腐蚀实验、耐盐雾实验、附着力测试实验、耐磨性能测试等方法研究了特种聚酰亚胺作为油田管道涂层的化学性能和机械性能。实验结果表明:在盐雾试验中测试样板版面划线处任意一侧腐蚀扩散宽度小于2 mm,未划线处无生锈、起泡、开裂和脱落等腐蚀失效现象;在耐磨性能实验中参考二氧化锆的磨损量为0. 001 67 g/h,PI-S涂层的磨损量比二氧化锆还低,仅为0. 00 084 g/h;涂层耐高低温交变湿热实验结果表明涂层很好的经受高低温交变环境,实验后未出现鼓泡、脱层、针孔、裂纹现象;酸性高温高压模拟环境实验表明在高酸性模拟环境中浸泡168 h后,涂层表面未出现鼓泡、脱层、针孔、裂纹等现象;涂层能很好地经受住N-甲基吡咯烷酮(NMP)、盐酸、硫酸、氢氟酸、次氯酸的腐蚀,浸泡60 d后试样厚度有轻微的减小,基材没有出现腐蚀现象。

Performance Evaluation of Special Polyimide as Oilfield Tube Coating

Polyimide is one of the best organic polymer materials with comprehensive performance, which as a special engineering material has been widely used in aviation, aerospace, microelectronics, nano, liquid crystal, separation membrane, laser and other fields. Polyimide has excellent application prospects in anti-corrosion, but there are not many reports on polyimide as oilfield pipe coating. In this paper, an improved anti-corrosion coating was prepared on the surface of P110S steel used in oilfield by electrostatic spraying. The corrosion resistance of the coating in different corrosive environments was evaluated by salt spray test, immersion test and high temperature and high pressure dynamic weight loss test under the harsh environment of the simulated oil pipeline. The physical properties of the coating were evaluated by adhesion test and abrasion resistance test as well as high and low temperature alternating damp heat test. The experimental data show that the coating can not only withstand the corrosion in a high-pressure, high-acid environment, but also can withstand strong oxidizing acids such as sulfuric acid, hydrofluoric acid, and hypochlorous acid. The coating has very strong adhesion and mechanical strength, and the wear is only 1/2 of that of zirconium dioxide.