尿素对土壤中碳钢微生物腐蚀的影响.pdf

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1、物理化学学报(WuliHuaxueXuebao1NovemberActa脚．一Chim．Sin．2012，28(11)，2659—26682659[Article】doi：10．3866／PKU．WHXB201208243www．whxb．pku．edu．cn尿素对土壤中碳钢微生物腐蚀的影响孙成李喜明许进闫茂成王福会王振尧(中国科学院金属研究所，金属腐蚀与防护国家重点实验室，沈阳110016)摘要：采用失重、极化曲线和阻抗谱等方法研究了尿素对土壤中微生物腐蚀(MlC)的影响．研究结果表明，在接菌土壤中尿素加速碳钢的腐蚀，而在灭菌土壤中抑

2、制其腐蚀．接菌土壤中由于硫酸盐还原菌(SRB)的存在，腐蚀产物中检测到FeSz．电化学阻抗谱(EIS)的结果表明，在实验后期腐蚀过程由浓差极化控制．关键词：硫酸盐还原菌：碳钢：尿素：电化学阻抗谱：失重中图分类号：0646EfectofUreaonMicrobioIogiCaIlyInducedCorrosionofCarbonSteeljnSoiISUNChengLIXi—MingXUJinYANMac—ChengWANGFu-HuiWANGZhen—Yao(StateKeyLaboratoryfo，CorrosionandProtec

3、tion，InstituteofMetalsResearch，ChineseAcademyofSciences，Shenyang110016,PR．China)Abstract：Theeffectofureaonmicrobiologicallyinducedcorrosion(MIC)ofcarbonsteelinsol1wasinvestigatedusingweight-lossmeasurement，electrochemicaJpolarization，andelectrochemicalimpedancespectrosco

4、pyfEiS)．Ureatendstoacceleratecorrosionofcarbonsteelininoculatedsoilsandinhibitcorrosioninsterilesoils．Ininoculatedsoils，FeS2wasdetectedincorrosionproductsbecauseofthepresenceofsulfate-reducingbacteria(SRB)．TheEISresultsshowedthattheprocesswascontrolledbyconcentrationpola

5、rizationinthelaterstages．KeyWords：Sulphate—reducingbacteria；Carbonsteel；Urea；Electrochemicalimpedancespectroscopy；Weightloss1Jntroductionmetabolism，growth，andreproduction．NumerousstudiesoncorrosionofcarbonsteelinsoilisaffectedbythemetalSRBcorrosionmechanismhavebeenreport

6、ed：，，theclassi．characteristics．butismoreattributedtotheambientsoilenvi—calcathodicdepolarizationtheory,themetaboliteproducttheo．ronmentsuchassoilhumidity，acidity,soilsalinity,andcompo—ry,theeffectofironsulfideandhydrogensulfide(H2S)andsositionofmicrobesandsoon．’一Microbes

7、areespeciallyabun．on．Althoughconflictsexitamongthesemechanisms，agree—dantinsoilandhavebeenwidelyrecognizedasoneofthema．menthasbeenreachedontheaggressiveactivityofSRBandiorfactorsthatinfluencethecorrosionbehaviorofburiedmet—theircorosiverole．SIalsohasinfluencesontheenviro

8、n．a1structures．knownasmicrobiologicalinducedcorrosionmentp~ameter．JavaherdashtimentionedthatSRBhaddeter