针对地热水环境中金属管道和设备常见的结垢问题,采用图像二值化处理法、扫描电子显微镜、能谱仪、电化学测试等方法对比研究了304不锈钢管、环氧有机硅涂层、聚苯硫醚(PPS)涂层和聚四氟乙烯(PTFE)/PPS复合涂层在静态模拟地热水中的阻垢性能.结果表明:地热水中不同涂层表面结垢物质的微观形貌为"针"形物,组成主要为CaCO3;PTFE/PPS涂层的表面能低于单纯的PPS涂层,可以有效地抑制结垢晶核在其表面的形成;实验10天的PTFE/PPS涂层表面的结垢质量为304不锈钢管表面结垢质量的37.3%;同时,PTFE/PPS涂层在模拟地热水中具有较好的耐蚀性.
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