B型套筒焊接对X80管线钢性能的影响
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摘要
为了研究B型套筒焊接对X80管线钢服役性能及腐蚀行为的影响,通过对X80母材及HAZ试样采用金相、硬度、拉伸、冲击、弯曲等测试,研究了焊接对管线钢各项理化性能的影响,并采用挂片失重法、表面分析(SEM/EDS)、电化学测试等方法,探究了套筒、X80母材及HAZ区在土壤模拟溶液中的腐蚀电位及腐蚀速率。结果表明:X80母材及其焊接HAZ的理化性能均符合标准;在模拟溶液中浸泡7 d后,Q345B套筒腐蚀速率>X80HAZ腐蚀速率>X80母材腐蚀速率,电化学测试显示X80母材的腐蚀电流随着腐蚀时间的增加而减少,HAZ试样和套筒的腐蚀电流随时间的增加而增大。B型套筒焊接后对X80管线钢母材的理化性能影响不大; 3种试样的腐蚀速率均属于中度腐蚀,但随着腐蚀时间的延长,HAZ和套筒的腐蚀倾向性越大,O_2、SO4_~(2-)和Cl~-对管材的腐蚀起主导作用。
Through the experiments of metallographic,hardness,tensile,impact and bending on X80 base metal and HAZ samples,the effect of welding on the physical and chemical properties of pipeline steel was studied. Besides,the weight loss method,surface analysis( SEM/EDS) and electrochemical test were used to study the corrosion potential and corrosion rate of the sleeve,X80 base metal and HAZ zone in the soil simulated solution. Results showed that soaking for 7 days in the simulated solution,the corrosion rate was ranked as Q345B sleeve> X80 HAZ> X80 parent material. Electrochemical tests showed that the corrosion current of X80 base metal decreased with the increase of corrosion time,and the corrosion current of HAZ zone and sleeve sample increased with time. After the B-type sleeve welding,the physical and chemical properties of the X80 pipeline steel base metal had little effect. HAZ zone and sleeve had large corrosion tendency,and the corrosion rates of the three types of samples belonged to moderate corrosion. O_2,SO_4~(2-) and Cl~- played leading roles in the corrosion of the pipe.
Through the experiments of metallographic,hardness,tensile,impact and bending on X80 base metal and HAZ samples,the effect of welding on the physical and chemical properties of pipeline steel was studied. Besides,the weight loss method,surface analysis( SEM/EDS) and electrochemical test were used to study the corrosion potential and corrosion rate of the sleeve,X80 base metal and HAZ zone in the soil simulated solution. Results showed that soaking for 7 days in the simulated solution,the corrosion rate was ranked as Q345B sleeve> X80 HAZ> X80 parent material. Electrochemical tests showed that the corrosion current of X80 base metal decreased with the increase of corrosion time,and the corrosion current of HAZ zone and sleeve sample increased with time. After the B-type sleeve welding,the physical and chemical properties of the X80 pipeline steel base metal had little effect. HAZ zone and sleeve had large corrosion tendency,and the corrosion rates of the three types of samples belonged to moderate corrosion. O_2,SO_4~(2-) and Cl~- played leading roles in the corrosion of the pipe.
引文
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[2] AYDIN H,NELSON T W. Microstructure and mechanical properties of hard zone in friction stir welded X80 pipeline steel relative to different heat input[J].Materials Science&Engineering A,2013,586(6):313-322.
[3]李荣光,杜娟,赵国星,等.油气长输管道管体缺陷及修复技术概述[J].石油工程建设,2016,42(1):10-13.
[4]颜凌云,胡楠楠,郏义征. X80管线钢在近中性p H溶液中腐蚀行为研究[J].表面技术,2016,45(3):52-57.
[5]石志强,张秀云,王彦芳,等. SO24-对X100管线钢在盐渍性溶液中点蚀行为的影响[J].中国石油大学学报(自然科学版),2016,40(1):128-133.
[6]王彬彬,王军,卢志伟,等.红壤模拟溶液中Cl-对X80管线钢腐蚀行为的影响[J].全面腐蚀控制,2016,30(11):54-58.
[7]赵麦群,雷阿丽.金属的腐蚀与防护[M].北京:国防工业出版社,2008:58-79.
[8]马大永,梁平,张云霞,等. X80管线钢焊缝在鹰潭土壤模拟溶液中的腐蚀行为[J].材料保护,2015,48(5):57-59.
[9]陈旭,吴明,何川,等.外加电位对钢及其焊缝在库尔勒土壤模拟溶液中行为的影响[J].金属学报,2010,46(8):951-958.
[10]史艳华,梁平. Q345钢在抚顺地区土壤饱和溶液中的腐蚀行为[J].腐蚀科学与防护技术,2012,24(6):473-477.