腐蚀严重威胁电站锅炉的安全稳定运行。介绍了一起典型的小孔腐蚀失效案例, 通过对水冷蒸发屏SA-210C无缝钢管腐蚀的宏微观形貌、腐蚀产物成分以及腐蚀产物的微观结构进行分析, 发现导致泄漏的原因是水冷蒸发屏管发生了小孔腐蚀; 而小孔腐蚀发生的根本原因在于锅炉水处理的工艺存在缺陷。最后根据泄漏失效原因提出了相应的整改措施, 有效避免了该问题的再次发生。

Corrosion is a serious threat to the safe and stable operation of coal-fired power plant boilers. A typical pitting corrosion failure case was introduced, and by analyzing the macro and micro morphology of the water-cooled evaporation wall SA-210C seamless steel tube and chemical compositions and microstructure of the corrosion products, the cause of the leakage was concluded to be pitting corrosion of the tube, which was caused by the unreasonable treatment process of the boiler water. The corresponding corrective measures were proposed to avoid the recurrence of such problem.