碳钢弯管段流动加速腐蚀问题分析与研究  

Analysis and research on flow-accelerated corrosion at elbow of carbon steel pipeline

作　　者：程俊杰 王宏铭 潘代龙 司晓东 董云山 CHENG Junjie;WANG Hongming;PAN Dailong;SI Xiaodong;DONG Yunshan

机构地区：[1]宁夏京能宁东发电有限责任公司,宁夏银川751400 [2]江苏科技大学能源与动力学院,江苏镇江212100

出　　处：《有色设备》2024年第1期8-14,共7页Nonferrous Metallurgical Equipment

基　　金：江苏省双创博士项目(JSSCBS20210994);江苏省高等学校基础科学(自然科学)研究面上项目(23KJB430015);中国博士后科学基金第73批面上资助项目(2023M732564)。

摘　　要：弯管是化工及电力管道中容易失效的构件之一。本文通过电化学测量研究了碳钢弯管段不同入口流速(1 m/s、2 m/s和3 m/s)下腐蚀电流密度的分布情况,并基于稳态传质电化学腐蚀结合电偶腐蚀理论建立了碳钢弯管段肘部流动加速腐蚀预测模型。试验结果表明,碳钢弯管段的腐蚀电流密度最大值出现在弯管段的最外侧,这说明弯管外侧的弯曲部位更容易发生穿孔。此外,弯管段的电偶腐蚀密度分布与试验结果和电厂实际统计情况相一致,验证了该模型的准确性。研究结果可为电力、化工等工业输运管道的设计优化和运行监测提供有效依据。The elbow is one of the components that are prone to failure in chemical and power pipelines.This study investigates the distribution of corrosion current density in carbon steel elbow sections under different inlet velocities(1 m/s,2 m/s,and 3 m/s)through electrochemical measurements.Based on steady-state mass transfer electrochemical corrosion combined with galvanic corrosion theory,a prediction model for accelerated corrosion in the flow of carbon steel elbow sections is established.The experimental results show that the maximum corrosion current density of carbon steel elbow sections occurs on the outer side of the elbow,indicating that the curved part on the outer side of the elbow is more prone to perforation.In addition,the distribution of galvanic corrosion density in elbow sections is consistent with the experimental results and statistical data from power plants,validating the accuracy of the model.The research findings can provide effective basis for the design optimization and operation monitoring of industrial transport pipelines in the power and chemical industries.

关 键 词：流动速腐蚀 弯管 电偶腐蚀 预测模型 碳钢 腐蚀电流密度 

分 类 号：TG174[金属学及工艺—金属表面处理]