酸雨对低碳钢腐蚀行为的影响.docxVIP

2011年6月JournalofIronandSteelResearchJune2011酸雨对低碳钢腐蚀行为的影响翠1,2,陈三娟2,文3,赵立才2林何(1.南昌航空大学轻合金加工科学与技术国防重点学科实验室,江西南昌330063;2.南昌航空大学材料科学与工程学院,江西南昌330063;3.南昌航空大学分析测试中心,江西南昌330063)摘要:利用金相显微镜(OM)、扫描电镜(SEM)、X射线衍射(XRD)等分析手段及电化学方法研究了低碳钢在模拟酸雨环境中的腐蚀行为。研究结果表明:碳钢在酸雨环境中腐蚀是一个局部腐蚀和均匀腐蚀并存的过程,溶液中的SO2-和Cl-离子的存在加速了碳钢表面腐蚀坑的形成和生长,腐蚀坑优先出现在铁素体上。腐蚀产物主4要有γ2FeOOH,Fe3O4和少量α2FeOOH,主要以针状或棉絮状形式出现。碳钢在模拟酸雨环境中腐蚀1104h,腐蚀失重曲线分为两个阶段,都符合线性增长规律,腐蚀72h,腐蚀失重较快,腐蚀72～1104h期间,腐蚀增重速率相对减慢。电化学测试表明:随着腐蚀的进行,自腐蚀电位Ecorr负移,腐蚀电流密度Icorr增加,腐蚀倾向增加。关键词:碳钢;模拟酸雨环境;腐蚀行为;电化学测试文献标志码:A文章编号:100120963(2011)0620018206EffectofAcidRainonCorrosionBehaviorofMildSteelLINCui1,2,CHENSan2juan2,HEWen3,ZHAOLi2cai2(1.NationalDefenceKeyDisciplineLaboratoryofLightAlloyProcessingScienceandTechnology,NanchangHangkongUniversity,Nanchang330063,Jiangxi,China;2.SchoolofMaterialScienceandEngineering,NanchangHangkongUniversity,Nanchang330063,Jiangxi,China;3.AnalysisandTestingCentre,NanchangHangkongUniversity,Nanchang330063,Jiangxi,China)Abstract:Corrosionbehaviorofmildsteelinthesimulatedacidrainenvironmentwasinvestigatedbyopticalmi2croscopy(OM),scanningelectronmicroscopy(SEM)andX2raydiffraction(XRD),andelectrochemicalmethods.Itisfoundthatcorrosionofcarbonsteelinacidrainenvironmentisacoexistentprocessoflocalizedcorrosionanduni2SO2-andCl-ionscanacceleratetheformationandgrowthofpitsonthesurfaceofmildsteel,formcorrosion.4whichpreferentiallyappearedontheferritephase.Thecorrosionproductsweremainlycomposedofγ2FeOOH,Fe3O4,alittleα2FeOOH.Fromthemicroscopicpointofview,needle2likeandcotton2balltypecorrosionproductsexisted.Themasslosscurveisdividedintotwostageswhichbothfollowedthelineargrowthlaw.Duringthefirst72h,themasslossrapidlyincreased,andfrom72hto1104h,thecorrosionratewasrelativelyslow.Electro2chemicalmeasurementshowedthattherewerethemorenegativecorrosionpotentialEcorrandthelargercorrosioncurrentdensityIcorrwiththeextensionoftime,indicatingtheincreasingcorrosiontendency.Keywords:carbonsteel;simulatedacidrainenvironment;corrosionbehavior;electrochemicaltest碳钢广泛应用