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【英文标准名称】:StandardTestMethodforConductingCyclicGalvanostaircasePolarization
【原文标准名称】:循环电流梯级极化的标准试验方法
【标准号】:ASTMG100-1989(2010)e1
【标准状态】:现行
【国别】:美国
【发布日期】:1989
【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】:aluminum;corrosion;electrochemicalmeasurement;galvanostaircase;localizedcorrosion;polarization;UNSA93003(Wr.alum.alloy);Alloys;Aluminumalloys--corrosiontesting;Breakdownpotential(Eb);Crevicecorrosion;Cycliccorrosiontesti
【摘要】:Inthistestmethod,susceptibilitytolocalizedcorrosionofaluminumisindicatedbyaprotectionpotential(Eprot)determinedbycyclicgalvanostaircasepolarization(1).Themorenoblethispotential,thelesssusceptibleisthealloytoinitiationoflocalizedcorrosion.Theresultsofthistestmethodarenotintendedtocorrelateinaquantitativemannerwiththerateofpropagationoflocalizedcorrosionthatonemightobserveinservice.Thebreakdown(Eb),andprotectionpotentials(Eprot)determinedbythecyclicGSCPmethodcorrelatewiththeconstantpotentialcorrosiontest(immersion-glassware)resultforaluminum(1,6,8).WhentheappliedpotentialwasmorenegativethantheGSCPEprot,nopitinitiationwasobserved.WhentheappliedpotentialwasmorepositivethantheGSCPEprot,pittingoccurredevenwhentheappliedpotentialwaslessnegativethanEb.SeverecrevicecorrosionoccurredwhentheseparationofEbandEprotwas500mVorgreaterandEprotwaslessthanx2212;400mVVs.SCE(in100ppmNaCl)(1,6,7).Foraluminum,EprotdeterminedbycyclicGSCPagreeswiththerepassivationpotentialdeterminedbythescratchpotentiostaticmethod(1,10).BoththescratchpotentiostaticmethodandtheconstantpotentialtechniquefordeterminationofEprotrequiremuchlongertesttimesandaremoreinvolvedtechniquesthantheGSCPmethod.DeBerryandViebeck(3-5)foundthatthebreakdownpotentials(Eb)(galvanodynamicpolarization,similartoGSCPbutnokineticinformation)hadagoodcorrelationwiththeinhibitionoflocalizedcorrosionof304Lstainlesssteelbysurfaceactivecompounds.Theyattainedaccuracyandprecisionbyavoidingthestronginductioneffectwhichtheyobservedbythepotentiodynamictechnique.Ifthistestmethodisfollowedusingthespecificalloydiscusseditwillprovide(GSCP)measurementsthatwillreproducedatadevelopedatothertimesinotherlaboratories.EbandEprotobtainedarebasedontheresultsfromeightdifferentlaboratoriesthatfollowedthestandardprocedureusingaluminumalloy3003-H14(UNSA93003).EbandEprotareincludedwithstatisticalanalysistoindicatetheacceptablerange.1.1Thistestmethodcoversaprocedureforconductingcyclicgalvanostaircasepolarization(GSCP)todeterminerelativesusceptibilitytolocalizedcorrosion(pittingandcrevicecorrosion)foraluminumalloy3003-H14(UNSA93003)(1).Itmayserveasguideforexaminationofotheralloys(2-5).Thistestmethodalsodescribesaprocedurethatcanbeusedasacheckforone''sexperimentaltechniqueandinstrumentation.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafet......
【中国标准分类号】:A29
【国际标准分类号】:25_220_20
【页数】:4P.;A4
【正文语种】:英语


【英文标准名称】:Communicationsystemsformetersandremotereadingofmeters-Part6:LocalBus
【原文标准名称】:仪表和仪表远程读数用通信系统.局域总线
【标准号】:BSEN13757-6-2008
【标准状态】:现行
【国别】:英国
【发布日期】:2008-10-31
【实施或试行日期】:2008-10-31
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:CE标记;合格证明书;认证(认可);分类;一致性;连接件;装配产品;定义;隔膜阀;适用性;手动的;工业配件;工业管道系统;工业;作标记;管道;塑料管道;电动的;规范(验收);试验;热塑性聚合物;类型;阀门
【英文主题词】:CEmarking;Certificatesofconformity;Certification(approval);Classification;Conformity;Connections;Constructionalproducts;Definition;Definitions;Diaphragmvalves;Fitnessforpurpose;Handoperated;Industrialfittings;Industrialpipeworksystems;Industries;Marking;Pipelines;Plasticpipelines;Power-operated;Specification(approval);Testing;Thermoplasticpolymers;Types;Valves
【摘要】:Thisstandardspecifiesthephysicallayerparametersofalocalmeterreadoutsystem(“LocalBus”)forthecommunicationwithandthereadoutofasinglemeterorasmallclusterofmeters(max.5)viaasinglebatterypoweredreadoutdevice(“master”)whichcanbeconnectedtemporarilyorstationaryforthecommunicationdirectlytoameter(i.e.localreadout)orviaafixedwiringorasmallbus(totalcablelengthmax.50m,i.e.localremotereadout).Forgenericdescriptionsconcerningcommunicationsystemsformetersandremotereadingofmeters,refertoEN13757-1.
【中国标准分类号】:M10
【国际标准分类号】:33_200;35_100_10;35_100_20
【页数】:12P.;A4
【正文语种】:英语