X80管线钢焊缝接头的耐蚀性研究
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摘要
为研究X80管线钢焊接接头不同部位在碱性土壤溶液中的耐腐蚀性,利用极化曲线、电化学阻抗(EIS)法分别研究了X80管线钢基体(BM)、热影响区(HAZ)和焊缝(WM)的耐蚀性能,并利用XRD分别测量了其晶粒尺寸。结果表明:BM的腐蚀电位最大,腐蚀电流密度最小,即耐腐蚀性最好。与BM相比,HAZ和WM的耐腐蚀性依次降低;晶粒尺寸按BM In order to study the corrosion resistance of different zones of X80 pipeline steel weld joints,the corrosion resistance of based matrix( BM),heat affected zone( HAZ) and weld( WM) of X80 pipeline steel was studied by using polarization curve and electrochemical impedance( EIS) method,and the grain size of different zones was measured by XRD. Results showed that the corrosion resistance of BM was the best with the largest corrosion potential and the smallest corrosion current density. In comparison of BM,the corrosion resistance of HAZ and WM decreased in order. Moreover,the increasing order of grain size was BM
引文
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[2]HUDSON M.Welding of X-100 linepipe,PhD thesis[D].Bedfordshire:Cranfield University,2004:17-40.
[3]VAN B G,CHEN W,ROGGE R.The role of residual stress in neutral p H stress corrosion cracking of pipeline steels.Part I:Pitting and cracking occurrence[J].Acta Materialia,2007,55(1):29-42.
[4]HUANG H H,TSAI W T,LEE J T.The influences of microstructure and composition on the electrochemical behaviour of a516 steel weldment[J].Corrosion Science,1994,36(6):1 027-1 038.
[5]ZHANG G A,CHENG Y F.Micro-electrochemical characterization of corrosion of welded X70 pipeline steel in nearneutral p H solution[J].Corrosion Science,2009,51(8):1 714-1 724.
[6]陈叶,费敬银,万冰华,等.埋地X80石油管道的应力腐蚀与防护[J].热加工工艺,2011,22(40):55-59.
[7]LI W S,LUO J L.Uniformity of passive films formed on ferrite and martensite by different inorganic inhibitors[J].Corrosion Science,2002,44(8):1 695-1 712.
[8]龚敏,张国虎,曾祥梅,等.X80管线钢在模拟土壤介质中的电化学行为[J].热加工工艺,2011,40(12):31-33.
[9]胥聪敏,X80管线钢在模拟盐碱土壤介质中的电化学腐蚀行为研究[J].材料工程,2009,12(9):66-71.
[10]ALIZADEH M,BORDBAR S.The influence of microstructure on the protective properties of the corrosion product layer generated on the welded API X70 steel in chloride solution[J].Corrosion Science,2013,70(5):170-179.