摘要
依托现有的教师科研项目,设计了研究焊接接头多尺度腐蚀行为的综合性实验。该实验针对焊接接头这一非均匀结构的局部腐蚀问题,以微电极阵列为纽带,联用三种电化学测试方法,从三个不同尺度获取电化学信息,并进而对局部腐蚀过程进行准确解析。经典电化学测试结果表明,X80钢焊接接头的各组成部分若孤立存在,在CO_(2)饱和的3%NaCl溶液环境中的腐蚀电流密度为WM<BM<FGHAZ<CGHAZ<ICHAZ,焊缝区应是最耐蚀的部位;而各部分耦合后,微电极阵列和微区电化学测试结果均表明,焊缝区始终作为主阳极加速腐蚀,母材区和热影响区则作为主阴极减缓腐蚀。在该文实验条件下,焊缝区是X80钢模拟焊接接头的薄弱环节。
Based on the existing teachers'scientific research projects,a comprehensive experiment was designed to study the multi-scale corrosion behavior of welded joints.Aiming at the local corrosion problem of the non-uniform structure of the welded joint,the experiment takes the microelectrode array as the link,and uses three electrochemical test methods to obtain the electrochemical information from three different scales,and then accurately analyze the local corrosion process.Classical electrochemical test results show that the corrosion current density of X80 steel welded joint is WM<BM<FGHAZ<CGHAZ<ICHAZ in CO_(2)-saturated 3%NaCl solution,and the weld zone should be the most corrosion resistant part.The results of microelectrode array and micro-electrochemical test show that the weld zone always acts as the main anode to accelerate corrosion,while the base metal zone and heat-affected zone act as the main cathode to slow down corrosion.Under the experimental conditions in this paper,the weld zone is the weak link of X80 steel simulated welded joint.
作者
李焰
姚万鹏
程洋
豆肖辉
李亚东
LI Yan;YAO Wanpeng;CHENG Yang;DOU Xiaohui;LI Yadong(School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China)
出处
《实验技术与管理》
CAS
北大核心
2022年第9期175-180,共6页
Experimental Technology and Management
基金
国家自然科学基金面上项目(41676071,51979282)
教育部产学合作协同育人项目(201902219002)。
作者简介
李焰(1972-),男,贵州贵阳,博士,教授,主要研究方向为能源装备腐蚀与防护,yanlee@upc.edu.cn。
