CO2分压对X80管线钢腐蚀性能的影响刘晓玮,蔡庆伍,武会宾,张杰(北京科技大学高效轧制国家工程研究中心,北京100083)摘要:模拟油田CO2驱油现场环境,利用高温高压反应釜,采用失重法、扫描电镜(SEM)、X射线衍射(XRD)等方法,研究了不同CO2分压对X80管线钢腐蚀性能的影响。结果表明,X80管线钢的腐蚀速率随着CO2分压的升高呈先升高后下降的趋势,在CO2分压为1.5MPa时达到最大值。当CO2分压为0MPa和0.5MPa时发生均匀腐蚀,当分压升高到1.5MPa和2MPa时发生了局部腐蚀。CO2分压为0MPa时的腐蚀产物为非晶态物质,其余各分压下的腐蚀产物均以FeCO3为主。随着CO2分压的升高,腐蚀产物与基体结合的紧密度随着CO2分压的升高越来越紧密;腐蚀产物膜厚度呈先升高后降低的趋势,与腐蚀速率的变化相对应。关键词:X80管线钢;二氧化碳分压;腐蚀性能中图分类号:TG172文献标识码:A文章编号:1005-748X(2012)06-0502-05EffectofCO2PartialPressureonCorrosionResistanceofX80PipelineSteelLIUXiao-wei,CAIQing-wu,WUHui-bin,ZHANGJie(NationalEngineeringResearchCenterforAdvancedRollingTechnology,UniversityofScienceandTechnologyBeijing,Beijing100083,China)Abstract:TheeffectofCO2partialpressureoncorrosionresistanceofX80pipelinesteelwasinvestigatedinhightemperatureandpressureautoclavesimulatingthedownholeenvironmentofanoilfield,usingtheweightlossmethod,SEMandXRD.TheresultsshowedthatwithincreasingCO2partialpressure,thecorrosionrateofX80pipelinesteelshowedthetendencyoffluctuation,andthemaximumrateappearedattheCO2partialpressureof1.5MPa.UniformcorrosionoccurredwhentheCO2partialpressurewas0MPaand0.5MPa.WhentheCO2partialpressurewas1.5MPaand2MPa,localizedcorrosionoccurred.Thecorrosionproductwascomposedofnoncrystallinesubstanceatpartialpressureof0MPa,andmainlycomposedofFeCO3atotherpartialpressures.WithincreasingtheCO2partialpressure,thecombinationbetweencorrosionproductandsubstratewasincreasinglyclose,andthethicknessofcorrosionproductshowedthetendencyoffluctuation,correspondingtothechangeincorrosionrate.Keywords:X80pipelinesteel;CO2partialpressure;corrosionresisitance0引言CO2作为伴生气体在石油、天然气的勘探和开采过程中产生,造成的CO2腐蚀成为石油和天然气工业安全生产的重要问题。特别是随着深层含CO2油气层开发和“C...