标准名称：	GB/T 27404-2008《实验室质量控制规范 食品理化检测》理解与实施
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出版社：	中国标准出版社
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书号：	978-7-5066-5277-3

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【英文标准名称】:StandardTestMethodforConductingPotentiodynamicPolarizationResistanceMeasurements
【原文标准名称】:动电势极化电阻测量的标准试验方法
【标准号】:ASTMG59-1997(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:1997
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:G01.11
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:anodicpolarization;auxiliaryelectrode;cathodicpolarization;corrosion;corrosionpotential;corrosionrate;currentdensity;electrochemicalcell;electrochemicalpotential;Lugginprobe;mixedpotential;open-circuitpotential;overvoltage;polariza
【摘要】:Thistestmethodcanbeutilizedtoverifytheperformanceofpolarizationresistancemeasurementequipmentincludingreferenceelectrodes,electrochemicalcells,potentiostats,scangenerators,measuringandrecordingdevices.Thetestmethodisalsousefulfortrainingoperatorsinsamplepreparationandexperimentaltechniquesforpolarizationresistancemeasurements.Polarizationresistancecanberelatedtotherateofgeneralcorrosionformetalsatorneartheircorrosionpotential,Ecorr.Polarizationresistancemeasurementsareanaccurateandrapidwaytomeasurethegeneralcorrosionrate.Realtimecorrosionmonitoringisacommonapplication.Thetechniquecanalsobeusedasawaytorankalloys,inhibitors,andsoforthinorderofresistancetogeneralcorrosion.Inthistestmethod,asmallpotentialscan,x0394;E(t),definedwithrespecttothecorrosionpotential(x0394;E=Ex2013;Ecorr),isappliedtoametalsample.Theresultantcurrentsarerecorded.Thepolarizationresistance,RP,ofacorrodingelectrodeisdefinedfromEq1astheslopeofapotentialversuscurrentdensityplotati=0(1-4):Thecurrentdensityisgivenbyi.Thecorrosioncurrentdensity,icorr,isrelatedtothepolarizationresistancebytheStern-Gearycoefficient,B.(3),ThedimensionofRpisohm-cm2,icorrismuA/cm2,andBisinV.TheStern-Gearycoefficientisrelatedtotheanodic,ba,andcathodic,bc,TafelslopesasperEq3.TheunitsoftheTafelslopesareV.Thecorrosionrate,CR,inmmperyearcanbedeterminedfromEq4inwhichEWistheequivalentweightofthecorrodingspeciesingramsandx03C1;isthedensityofthecorrodingmaterialing/cm3.RefertoPracticeG102forderivationsoftheaboveequationsandmethodsforestimatingTafelslopes.Thetestmethodmaynotbeappropriatetomeasurepolarizationresistanceonallmaterialsorinallenvironments.See9.2foradiscussionofmethodbiasesarisingfromsolutionresistanceandelectrodecapacitance.1.1Thistestmethodcoversanexperimentalprocedureforpolarizationresistancemeasurementswhichcanbeusedforthecalibrationofequipmentandverificationofexperimentaltechnique.Thetestmethodcanprovidereproduciblecorrosionpotentialsandpotentiodynamicpolarizationresistancemeasurements.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatory......
【中国标准分类号】:A55
【国际标准分类号】:17_220_20
【页数】:4P.;A4
【正文语种】:英语