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Self-repairing poly(phenylenesulfide) coatings in hydrothermal environments at 200℃

机译:200℃水热环境中的自修复聚苯硫醚涂料

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Usefulness of hydraulic calcium aluminate (CA) fillers, containing monocalcium aluminate (CaO.Al_2O_3) and calcium bialuminate (CaO.2Al_2O_3) reactants as the major phases, in healing and repairing micro-sized cracks generated on the surfaces of poly(phenylenesulfide) (PPS) coating was evaluated by exposing the cleaved coatings to a simulated geothermal environment. CA fillers with a grain size of <40 μm were incorporated into the PPS coatings. The cleaved PPS coatings containing fillers then were exposed for up to 20 days in a 200℃ CO_2-laden brine. The decalcification-hydration reactions of the CaO.Al_2O_3 and CaO.2Al_2O_3 reactants disclosed in the cracks led to the rapid growth of boehmite crystals, while the crystalline calcite phase formed by the carbonation of these reactants was leached out of cracks because of the formation of water-soluble calcium bicarbonate. During exposure for 24 h, the block-like boehmite crystals, ~4 μm in size, densely filled and sealed the open cracks; this was reflected in an increase in pore resistance to two orders of its magnitude compared with that of cleaved coatings without fillers. Extending the exposure time to 20 days resulted in no change in pore resistance, suggesting that the sealing of the cracks by boehmite crystals played an essential role in reconstituting and restoring the function of the failed coatings as corrosion-preventing barrier. Therefore, CA-filled PPS coatings are able to self-heal and -repair cracks generated on the surfaces of coating films in hydrothermal environments.
机译:包含铝酸单钙(CaO.Al_2O_3)和双铝酸钙(CaO.2Al_2O_3)反应物为主要相的水硬铝酸钙(CA)填料在修复和修复聚苯硫醚表面上产生的微细裂纹方面的有用性(通过将劈开的涂层暴露在模拟的地热环境中来评估PPS涂层。 PPS涂层中加入了粒径小于40μm的CA填料。然后将裂解的含填料的PPS涂层在200℃的CO_2盐水中暴露20天。裂缝中披露的CaO.Al_2O_3和CaO.2Al_2O_3反应物的脱钙水化反应导致勃姆石晶体快速生长,而由于这些反应物的碳化而形成的方解石相结晶从裂缝中浸出。水溶性碳酸氢钙。暴露24小时后,块状勃姆石晶体〜4μm,致密地填充并密封了开裂的裂纹。与没有填料的开裂涂层相比,抗孔性提高了两个数量级,这反映了这一点。将暴露时间延长至20天不会导致耐孔性发生变化,这表明勃姆石晶体对裂缝的密封在重建和恢复失效涂层作为防腐层的功能方面起着至关重要的作用。因此,在水热环境中,CA填充的PPS涂料能够自我修复并修复在涂膜表面上产生的裂纹。

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