SRB和应力耦合作用下海底管道腐蚀数值模拟研究  

Numerical simulation of submarine pipeline corrosion induced by the interaction of SRB and mechanical stress

作　　者：骆正山[1] 李世宇 骆济豪 LUO Zhengshan;LI Shiyu;LUO Jihao(School of Management,Xi'an University of Architecture and Technology,Xi'an 710055,China;School of Information and Electronics,Beijing Institute of Technology,Beijing 102488,China)

机构地区：[1]西安建筑科技大学管理学院,西安710055 [2]北京理工大学信息与电子学院,北京102488

出　　处：《安全与环境学报》2025年第3期946-954,共9页Journal of Safety and Environment

基　　金：国家自然科学基金项目(41877527)。

摘　　要：硫酸盐还原菌腐蚀与应力腐蚀是两种典型的管道腐蚀,准确模拟这两种腐蚀耦合作用机理至关重要。为了揭示X80钢在海底环境下的腐蚀演化规律,依据生物催化硫酸盐还原理论确定电化学反应参数,采用小应变塑性模型对管道缺陷处应力应变进行模拟;建立多物理场耦合模型分析硫酸盐还原菌(Sulfate-Reducing Bacteria,SRB)与应力腐蚀规律。结果表明,SRB和应力腐蚀会相互促进,协同对管道进行腐蚀,通过Mises应力、腐蚀电位、电流密度等指标来预测。腐蚀强度随拉伸应变强度的增大而增快,在拉伸应变为4 mm时缺陷中心强度最大;在相同应变强度下,腐蚀缺陷半径为12 mm时缺陷处应力最大达830 MPa;同时,预测了管道在海洋环境下服役年限的腐蚀缺陷增长量,腐蚀深度随着服役年限呈现逐步扩大的趋势,而且逐步向缺陷中心内部延伸。Assessing the impact of coupled Sulfate-Reducing Bacteria(SRB)and mechanical stress on corrosion is essential for the safe operation of subsea oil and gas pipelines.This study examines the corrosion progression of X80 steel under subsea conditions affected by SRB and mechanical stress,utilizing a defect-containing submarine pipeline as a case study.Utilizing the biocatalytic cathodic sulfate reduction theory,electrochemical reaction parameters were defined,and a small strain plasticity model was implemented to simulate stress and strain at the defect site.A numerical model of pipeline corrosion was developed in COMSOL multiphysics,integrating secondary current distribution,solid mechanics,and geometric deformation.This study investigates the effects of stress distribution,corrosion potential,and corrosion current density,along with the impact of varying strain levels and defect sizes on corrosion behavior.The findings reveal a synergistic interaction between microbial activity and stress corrosion,which accelerates the corrosion of submarine pipelines with defects.Additionally,Mises stress metrics indicate that,for identical defect sizes,corrosion intensity increases with higher tensile strain.At a tensile strain of 2 mm,the material experiences a stress of 762 MPa,surpassing the yield limit of 743 MPa and leading to plastic deformation.The maximum strength at the center of the defect is observed at a tensile strain of 4 mm,with the most significant increase in strength-227 MPa-occurring between 3 mm and 4 mm.At the same strain level,a defect size of 12 mm leads to a maximum stress of 830 MPa,accompanied by increased anodic and cathodic current densities,which indicate a heightened intensity of the corrosion reaction.Additionally,taking into account the complex operational environment of submarine pipelines,the study forecasts corrosion defect growth over a service life ranging from 0 to 20 years.With an initial defect size of 6 mm,the corrosion depth progressively increases over time,particularly deepening betwe

关 键 词：安全工程 海底管道 微生物腐蚀 应力腐蚀开裂 数值模拟 

分 类 号：X937[环境科学与工程—安全科学]