Cu含量对油船货油舱焊缝耐蚀性的影响

Cu含量对油船货油舱焊缝耐蚀性的影响 Effect of Cu cont ent on corrosion resistance of oil tank cargo welding seam 陈慧 CHEN Hui 1 first-author 罗宏 LUO Hong 1 范银东 FAN Yindong 2 余祖孝 YU Zuxiao 2 段松 DUAN Song 1 朱宇霆 ZHU Yuting 2 四川轻化工大学材料科学与工程学院 四川轻化工大学材料科学与工程学院 Institute of Materials Science and Engineering,Sichuan University of Science and Engineering Institute of Materials Science and Engineering,Sichuan University of Science and Engineering 四川大西洋焊接材料股份有限公司 四川大西洋焊接材料股份有限公司 Atlantic China Welding Consumables Inc Atlantic China Welding Consumables Inc 以不同Cu含量的CHE507RCW焊条熔敷金属为研究对象,采用金相显微镜观察分析熔敷金属的显微组织,通过模拟油船货油舱舱底所处的腐蚀环境进行失重腐蚀实验,初步分析了试样在强酸高Cl-浓度环境中发生的腐蚀行为,并结合电化学实验和扫描振动参比电极技术(SVET)研究了Cu含量对焊缝试样耐蚀性的影响。结果表明:熔敷金属的显微组织均由铁素体+少量珠光体+少量第二相质点组成;试样在反应初期发生析氢腐蚀,随着腐蚀时间的延长,发生点蚀;在一定范围内,随着Cu含量的增加,熔敷金属的显微组织趋于均匀细小,晶界析出物变少,自腐蚀电位逐渐正移,自腐蚀电流逐渐减小,耐蚀性增加,表面腐蚀产物变得致密,抗点蚀能力增强。 In this paper,the CHE507 RCW electrode deposited metal with different Cu content was taken as the research object. Firstly,the microstructure of the deposited metal was observed by metallographic microscope,and then the weight loss corrosion experiment was carried out by simulating the corrosive environment of the cargo tank of the oil tanker. The corrosion behavior of the sample in the high acid and high Cl-concentration environment was studied. The effects of Cu content on the corrosion resistance of the weld samples were studied by means of electrochemical analysis and scanning vibration reference electrode technique（SVET）. The results show that the microstructure of the deposited metal consists of ferrite + a small amount of pearlite + a small amount of second phase particles;the sample undergoes hydrogen evolution corrosion at the initial stage of the reaction,and pitting occurs with the prolongation of corrosion time;Inside,with the increase of Cu content,the microstructure of the deposited metal tends to be uniform and fine,the precipitates at the grain boundary become less,the self-corrosion potential gradually shifts,the self-corrosion current gradually decreases,the corrosion resistance increases,the surface corrosion products become dense and the pitting corrosion resistance is enhanced. 货油舱 焊缝 耐蚀性 Cu含量 SVET cargo oil tank weld corrosion resistance Cu content SVET U671.8 2022-03-08 8 50