某中温过热器管道在运行约9 500 h后发生泄漏。采用化学成分分析、显微组织观察，腐蚀产物物相分析等方法对管件的腐蚀原因进行分析。结果表明:管道在高温、强腐蚀性环境中服役时，Cl元素破坏致密氧化膜，腐蚀金属基体，生成疏松的低熔点化合物。在高温烟气的冲刷作用下，管道外壁逐渐减薄，直至穿孔泄漏。

A medium-temperature superheater pipeline leaked after about 9 500 hours of operation. The corrosion causes of pipe fittings were analyzed by chemical composition analysis, microstructure observation, phase analysis of corrosion products and other methods. The results showed that when the pipeline was used in high temperature and strong corrosive environment, Cl element destroyed the dense oxide film, corroded the metal matrix, and generated loose low melting point compounds. Under the scouring action of high-temperature flue gas, the outer wall of the pipe gradually thined until the perforation and leakage occurred.