某火电厂敞开式循环冷却水系统碳钢管道发生腐蚀泄漏，采用宏观检查、金相检测、扫描电镜和能谱等方法对腐蚀原因进行研究。结果表明：循环水中含有大量Cl^-和SO₄^2-，而电厂使用的阻垢缓蚀剂对碳钢的缓蚀性能较差，导致碳钢内壁发生电化学腐蚀；循环水的浓缩倍率过高、pH长期偏低，也加速了腐蚀过程。建议电厂在进行阻垢缓蚀剂选用试验时重点考察对碳钢的缓蚀效果，运行期间加强循环水水质监督，确保循环水系统安全稳定运行。

The corrosion and leakage occurred in a carbon steel pipe of open circulating cooling water system in a thermal power plant. The corrosion reasons were analyzed by means of macroscopic inspection, metallographic detection, scanning electron microscopy and energy spectrum. The results showed that the circulating water contained a large number of chloride ions and sulfate ions. The currently used scale and corrosion inhibitors had poor corrosion inhibition performance on carbon steel materials, which led to serious electrochemical corrosion on the inner wall of carbon steel pipe. The corrosion process was accelerated because the concentration ratio of circulating water was over high and the pH value was low for a long time. It was suggested that the corrosion inhibition effect on carbon steel should be mainly investigated in the selection test of scaling corrosion inhibitor, and the quality supervision of circulating water should be strengthened to ensure the safe and stable operation of circulating water system.