Electrochemical Corrosion Behavior of X90 Pipeline Steel and Its Heat-affected Zone in Acidic Medium
摘 要
利用Gleeble 3500热/力模拟实验机对X90管线钢分别进行一次热循环及二次热循环,采用扫描电镜观察了X90管线钢原始组织及其热影响区的组织形貌,同时采用电化学方法研究和比较了X90管线钢原始组织及其热影响区在不同pH鹰潭模拟溶液中的电化学特性。结果表明,当溶液pH为3.3时,电化学阻抗呈现感抗特征,试样表面呈活化溶解状态,相对于X90的原始组织,晶粒较大的粗晶热影响区(CGHAZ)和临界粗晶热影响区(IRCGHAZ)试样表面活性较弱,具有更优异的耐蚀性;而当溶液pH为4.7及6.1时,电化学阻抗仅呈现容抗特征,组织表面呈带膜腐蚀状态,晶粒细化的细晶热影响区(FGHAZ)和过临界粗晶热影响区(SCCGHAZ)试样表面的产物膜较致密稳定,腐蚀电流密度较小,耐蚀性较好。
Abstract
X90 pipeline steel was subjected to a thermal cycle and a secondary thermal cycle using a Gleeble 3500 heat/force simulation machine. The microstructures of the X90 pipeline steel and its heat-affected zone were observed by scanning electron microscopy. The electrochemical properties of the original structure of X90 pipeline steel and its heat affected zone (HAZ) in different pH Yingtan simulated solutions were studied and compared. The results show that when the pH of the solution was 3.3, the electrochemical impedance exhibitted an inductive resistance characteristic, and the surface of the sample was activated and dissolved. Relative to the original structure of X90, the coarse grained HAZ (CGHAZ) and the critical coarse grain HAZ (IRCGHAZ) had larger surface activity and better corrosion resistance, when the pH of the solution was 4.7 and 6.1, the electrochemical impedance only exhibited capacitive reactance characteristics, and the surface of microstructure was in a state of film corrosion, the product film on the surface of the grain refinement fine grain zone HAZ (FGHAZ) and the supercritical coarse grain zone HAZ (SCCGHAZ) was denser and more stable, the corrosion current density was smaller, and the corrosion resistance was better.
中图分类号 TG172 DOI 10.11973/fsyfh-201903007
所属栏目 试验研究
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收稿日期 2017/10/20
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引用该论文: QI Zhengyang,WEN Ji,XU Rui,FANG Xiangpeng,CUI Gan,LI Zili. Electrochemical Corrosion Behavior of X90 Pipeline Steel and Its Heat-affected Zone in Acidic Medium[J]. Corrosion & Protection, 2019, 40(3): 190
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【3】尚成嘉. 第三代低合金钢研究进展——面向石油工业用钢的基础与应用研究[C]//石油天然气用高性能钢技术论坛——油气开采、储运的战略需求对钢铁材料的新挑战会议论文集. 北京:北京中国金属学会,2011:15.
【4】张刚刚,成育红,豆涛涛,等. 温度和pH对X90管线钢电化学性能的影响[J]. 石油化工应用,2016,35(12):50-53.
【5】牛辉,史立强,孙文君. X90管线钢热影响区不同区域组织性能的研究[J]. 热加工工艺,2015(7):85-87.
【6】罗金恒,张良,李丽锋,等. X90管道钢在NS4溶液中的电化学腐蚀行为[J]. 天然气工业,2016,36(6):92-97.
【7】刘成虎,柳伟,路民旭. X60钢及其焊接热影响区的腐蚀行为对比研究[J]. 腐蚀科学与防护技术,2008,20(3):206-208.
【8】黄晓辉,张冬冬,符利兵,等. X90螺旋埋弧焊管抗硫化氢性能的研究[J]. 北京联合大学学报,2014,28(4):81-85.
【9】ZHAO W,WANG W,CHEN S,et al. Effect of simulated welding thermal cycle on microstructure and mechanical properties of X90 pipeline steel[J]. Materials Science & Engineering A,2011,528(24):7417-7422.
【10】YAKUBTSOV I A,PORUKS P,BOYD J D. Microstructure and mechanical properties of bainitic low carbon high strength plate steels[J]. Materials Science and Engineering:A,2008,480(1/2):109-116.
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【19】刘顺洪,李志远,林兆凤. 焊接热影响区晶粒尺寸对腐蚀疲劳裂纹扩展机理的影响[J]. 热加工工艺,1994(3):13-16.
【20】毕宗岳. 管线钢管焊接技术[M]. 北京:石油工业出版社,2013.
【21】胡赓祥. 材料科学基础[M]. 上海:上海交通大学出版社,2000.
【22】孔君华,郑琳,郭斌,等. Mo对低碳微合金钢组织和性能的影响[J]. 轧钢,2005,22(4):27-29.
【23】李国鹏,韩秀林,赵波,等. X80和X90管线钢热影响区组织与韧性对比[J]. 焊管,2014(7):13-17.
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【25】曹中秋,刘伟华,郑治国. 不同晶粒尺寸的Cu-40Ni合金在酸性介质中的耐蚀性能[J]. 中国有色金属学报,2006,16(1):170.
【26】蒋春霞. 纳米多晶铝及其复合材料微观变形机理的研究[D]. 大连:大连理工大学,2015.
【27】ZHANG X H,PEHKONEN S O,KOCHERGINSKY N,et al. Copper corrosion in mildly alkaline water with the disinfectant monochloramine[J]. Corrosion Science,2002,44(11):2507-2528.
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