Based on the new type of device, widely used ND steel, Corten steel and 316L steel, compared with 20G steel and 20# steel, dewpoint corrosion was tested on a 600MW power plant in Inner Mongolia Datang International Tuoketuo Power Generation Co. ,Ltd. The temperature of inlet cycling water was 30-80℃ and the testing time was 72h. The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to analyze the microstructure and the migration of the corrosive elements. The mechanism of dewpoint corrosion was revealed, and the relationship between the thickness of corrosion layer and temperature of inlet water was obtained. The results also showed that the order of corrosion resistance for the five materials was 316L>ND>Corten>20G>20# .%以新型实验装置为基础,以ND钢、Corten钢、316L钢作为研究对象,20G与20 #碳钢为对比材料,以内蒙古大唐国际托克托发电有限公司5#机组为实验平台进行露点腐蚀实验,实验中循环介质温度为30～80℃,实验时间为72h.利用扫描电镜(SEM)和能谱分析(EDS)探查腐蚀后各材料微观组织结构,揭示露点腐蚀机理；绘制各材料的腐蚀层厚度随壁温的变化曲线；结果表明:5种材料的耐硫酸露点腐蚀能力:316L＞ ND＞Corten＞20G＞20#.
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