采用化学分析法对稀释蒸汽发生器管束垢样、壳程介质、管程介质分析表明,其中含有Cl-及少量的酸根离子等腐蚀介质。结合现场腐蚀调查,对稀释蒸汽发生器的腐蚀穿孔原因进行了讨论,认为其腐蚀机理为缝隙腐蚀,而闭塞电池的自催化作用则加速了缝隙腐蚀的速率,是造成稀释蒸汽发生器短期内发生腐蚀穿孔的根本原因。 Chemical analysis of dilute steam generator tube bundle scale samples, shell side media, pipe media analysis showed that it contains Cl- and a small amount of acid ions and other corrosive media. Combined with field corrosion investigation, the reasons of corrosion and perforation of dilution steam generator are discussed. The corrosion mechanism of crevice steam generator is thought to be crevice corrosion. The autocatalytic action of occluded battery accelerates the crevice corrosion rate, which causes short-term generation of dilution steam generator The root cause of corrosion perforation.