建立一套温度、压力、流速可控的流动加速腐蚀试验装置，模拟某蒸汽冷凝水管线工况，对20钢、Q345R钢、304不锈钢三种材料进行了流动加速腐蚀试验，采用电化学测量方法得到三种钢的Tafel曲线．应用扫描电镜（SEM）和能谱仪（EDS）对腐蚀产物膜的厚度、形貌与组分进行了分析．结果表明，相同工况条件下，腐蚀速度从大到小依次为20钢、Q345R钢、304不锈钢；20钢的腐蚀产物膜结构为球状；Q345R钢存在两种腐蚀产物膜结构，即网状结构和片状结构；304不锈钢腐蚀产物膜的结构为片状，有效的保护了基体材料．
The flow-accelerated-corrosion performance of 20 steel, Q345R steel and 304 stainless steel was investigated in condensed water by using a flow accelerated corrosion test apparatus with three electrodes measurement. Scanning electron microscope （SEM） and energy disperse spectroscopy （EDS） were employed to investigate the thickness, microstructure of corrosion scale. The results showed that the corrosion rates of the test steels were different with a decrease ranking as 20 steel〉Q345R steel〉304 stainless steel. Their microstructure of corrosion scale had different morphologies. The corrosion scale of Q345R steel was thicker than that of 20steel, but much better of compactness of the former ones.
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