Anti-scaling performance of PPS composite coatings in a circulated and simulated geothermal water environment

In the process of drawing out and transporting geothermal water from the geothermal wells, scaling on the surface of the metal pipes and pump is a common problem. In this paper, the anti-scaling performance of polyphenylenesulfide (PPS) coating, PPS/polyfluorinated ethylene propylene (FEP) and PPS/polytetrafluoroethylene (PTFE) coating were studied in a circulated and simulated geothermal water environment. The results indicated that the surface energy of fluorinated resin-blended PPS coating was lower than pure PPS coating, and their anti-scaling effects were also better than PPS coating. The growth appearance of scaling nucleus was affected by the eroding of running water and debasing of surface energy. Furthermore, the PPS/FEP coating had a better anti-corrosion performance in the geothermal water environment.