碳钢弯管段在不同温度下流动加速腐蚀性能试验研究  

Experimental study on flow-accelerated corrosion at elbow of carbon steel at different temperatures

作　　者：潘代龙 司晓东 张静 陈盈盈 聂彬彬 高月琦 PAN Dailong;SI Xiaodong;ZHANG Jing;CHEN Yingying;NIE Binbin;GAO Yueqi(School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang 212003,China)

机构地区：[1]江苏科技大学能源与动力学院,江苏镇江212003

出　　处：《热力发电》2022年第7期110-115,共6页Thermal Power Generation

基　　金：江苏省双创博士项目(JSSCBS20210994)。

摘　　要：流动加速腐蚀(flow-accelerated corrosion,FAC)会造成水和汽-水输运管道壁厚不断减薄,严重影响相关系统的安全性。采用能反应实际流动的高温循环回路试验系统和阵列电极技术,通过电化学测量研究不同温度对20号碳钢弯管段流动加速腐蚀性能的影响。结果表明:碳钢弯管试验段不同位置阵列电极的最小电荷传递电阻及相应的最大腐蚀电流密度分别出现在碳钢弯管试验段最内侧和最外侧位置。当温度低于90℃时,FAC性能变化不明显;温度高于90℃时,FAC速率显著增大。腐蚀最严重区域位于弯管最外侧附近。Flow-accelerated corrosion(FAC)issues encountered in water and water-steam mixture piping systems will cause contineous reduce of the wall thickness,which seriously affects the safety of the whole plants.In this paper,a high-temperature loop test system for FAC reflecting the actual flow combined with the array electrode technique was used to study the effect of different temperatures at elbow of No.20 carbon steel through electrochemical measurements.The results reveal that,the minimum charge transfer resistance and the maximum corrosion current density shows at the innermost and outermost positions of the elbow,respectively.When the temperature is lower than 90℃,the FAC performance does not change significantly.While the FAC rate increases significantly at temperature higher than 90℃.Moreover,the maximum FAC rate is located in the extrados side of test section.

关 键 词：阵列电极 弯管 流动加速腐蚀 温度 碳钢 

分 类 号：TM623.8[电气工程—电力系统及自动化]