CETPL全球实验室加速循环腐蚀试验

INTRODUCTION介绍TESTSCOPE试验范围Thisstandardspecifiesanacceleratedlaboratoryatmosphericcorrosiontest.Thetestingenvironmentaddressedissimilarineffecttothatofthesaltload/climaticpartoftheprovinggroundcorrosiontestprocedure,CETPandyieldscorrespondingresults.Theobjectiveofthetestistoallowevaluationofthecorrosionresistanceofmetalsinenvironmentswherethereisasignificantinfluenceofchlorideions,mainlyassodiumchloridefromamarinesourceorbywinterroadde-icingsalt.Thelaboratorytestprovidesfullexposuretothesaltloadandhumidityenvironment.Itdoesnotattempttosimulateotherengravingfactorssuchasmudloads,temperaturestressesorwearIt.servesasageneralpurposeatmosphericcorrosiontestandappliestoavarietyofmaterials,coatings,andinteractionsofmaterials,bothastestspecimensorindesignedcomponents.Thetestcanbeusedasadesignverificationmethodinorderto(a)developandqualifynewcorrosionresistantproducts,(b)developnewpre-treatmentsandfinishingprocesses,(c)selectmaterialsand,(d)performqualitycontrolofthefinalproduct.本标准是关于一项在实验室里加速进行的大气腐蚀试验。本文所述的试验环境类似于《试验场腐蚀试验程序》中的盐负荷 /环境影响部分，得出相应的结果。试验目的在于评估金属在富含氯化物的环境中（主要是海水中的盐或冬天用于融雪的盐）的抗腐蚀性。该实验室试验主要是将试验件完全暴露在湿润的盐负荷环境中，而非模拟其他摩擦因素如泥负荷、温度压力或磨损。该试验主要作为一项大气腐蚀试验，适用于各种各样的材料、涂层、试样或设计零部件材料的相互作用。该试验可作为一种验证设计的方法，用于 (a)开发并验证新的抗腐蚀产品；(b)开发新的预处理和表面处理工艺； (c)选择材料；(d)对最终产品的质量控制。Thestandardspecifiescontrolledconditionsforequipmentandprocedurestoallowthetesttobeperformedwithahighdegreeofrepeatabilityandreproducibility.Itisdesignedtobesuitabletoruninvariousclimatechambers,eitherasafullyautomatedprocedureorwithpartialmanualoperations.本标准说明了设备和程序的受控条件，让实验具有高度的重复性和再现性。本标准适用于多种环境试验箱，包括全自动试验或部分手动操作的试验。SUMMARYOFTESTCONTENT 试验内容摘要Theworkdaytestprocedureconsistsof:工作日的试验程序由以下几个方面组成：A6hwetphaseatroomtemperature.withintermittentexposuretosaltsolution%NaCl).Ahtransitionphasewithdryingunderclimatecontrol.Ahphasewithconstanttemperatureandhumidity(50C,70%RH).室温下6小时的加湿阶段，间歇曝露到%的氯化钠溶液中小时的过渡阶段，通过环境控制进行烘干小时的恒温恒湿阶段(50C,70%RH)AfterrepeatingthisprocedureMon-Fria48hweekendphaseundercontinuedconstantclimatecontrolisadded.从周一到周五重复该试验程序后，在周末加入持续恒定环境控，进行48小时的试验。COMMONALITY 共通性ThisisaCONTROLTESTandcanbeusedtoqualifycomponentsthroughouttheworld.Thetestmaybeconductedatanylocationhavingthenecessaryequipmentandfacilities.ProposedrevisionstothisproceduremustbesubmittedperFAP03-179.这是一项可验证世界上所有的零部件的控制试验，可在任何地方进行，只要具备所需的设备仪器。对本试验程序的修改建议必须按FAP03-179提交。INSTRUMENTATION仪器Thefollowingelementsareusuallyrequiredtoconductthetestprocedure:进行试验程序一般需要以下仪器：Compressed,cleanairof4-6barsforcleaningsaltsolutionfromspraynozzles,asasourcefortherenewalofchamberairandforhumidification,suppliedbysprayhumidifiers.4-6bar的干净的压缩空气，用于清理喷嘴上的盐溶液、箱内换气和喷雾加湿器进行加湿。Alowconductivitywatersupply(20Smax)forhumidificationorevaporativesprayhumidifiersandforthepreparationofsaltsolutions.一根低导电率的供水管（最大 20S），用于加湿或喷雾加湿器以及准备盐溶液。Atankforpreparationandstorageofsaltsolutionor,alternatively,asystemfordirecton-linemixingofwaterandsaturatedNaClsolutiontotheactualconcentration%byweight)一个用于准备和存储盐溶液的水槽，或者一套直接在线按实际浓度（量）混合水和饱和氯化钠溶液的系统。

%，按重Aconductivitymeterwithbuilt-intemperaturecompensationforpreparationandcontrolofthe%NaClsaltsolution(conductivity:mS/cm+at20C).A%byweightNaClsolutionisusedasacalibrationstandardateachmeasurement.一个带内置温度补偿的电导仪，用于准备和控制%的氯化钠盐溶液（温度为20C时的导电性：mS/cm+）。一份按重量为%的氯化钠溶液，作为每次测量时的校正标准。Ahighqualitydeviceforindependentcontroloftemperatureandrelativehumidityshallbeaccessible.Thisinstrumentshallonastipulatedregularinterval(Refbeusedforindependentmonitoringandcalibrationoftheconditionsintheverytestplaneoftheexposurechamber.ThetotalmeasurementerrormustnotexceedC.一套高质量的设备，用于独立控制温度和相对湿度。该设备按照规定的时间间隔（参考），独立监控和校正试验箱李的试验平面上的各项条件，测量总误差不超过C。Racksofinertmaterialforsupportandalignedfixationoftestspecimensmustnothamperafreeair-flowaroundthetestobjects,norcollectstandingwetness.Thetestobjectsinarackmustnotscreenoneanotherfromthesaltsolutiondownfallandtheyshouldbeexposedwiththestipulatedexposureangletothespray(15-20degreesinclinationfromvertical).由惰性材料制成的夹具，用于支撑、排列和固定试样，但不得妨碍试样周围的空气流通，不得累积水分。夹具上的试样不得相互遮蔽导致盐溶液淋不到试样上。试样应按规定的角度曝露到喷雾中（偏离垂直线15-20度）。Pressurizedhand-sprayequipmentforapplicationofthe%NaClsolution如需采取手动喷洒，应使用适用于%盐溶液的加压型手动喷雾器，喷雾器的容量必须能Funnels,beakers/measuringglassesandabalancewithatleastgaccuracyformonitoringandcalibrationofsaltsolutiondownfallthroughoutthetestplaneoftheexposurechamber.漏斗、烧杯/量杯以及精确度至少为的天平，用于监控和校准曝露箱中试验平面上落下的盐溶液。AlltestmeasurementequipmentmustbecalibratedandmaintainedperFAP03-015,Control,Calibration,andMaintenanceofMeasurementandTestEquipment.所有试验的测量设备的校准和维护必须按照《FAP03-015测量和试验设备的控制，校准和维护程序》。Allapplicablesafetyguidelinesandproceduresmustbefollowed.试验须遵守所有适用的安全指引和安全程序。EQUIPMENTANDFACILITIES设备设施Thenecessary,permanentlyinstalledfacilitytoconductthetestconsistsofaprogrammablehumiditychamberofgoodquality.Itispreferablyequippedwithanintegratedrigforsprayingsaltsolutionoftherequiredamountandaccuracy,coolingcapacityandagoodinternalcirculationsystemfortheconditionedair(Fig.1).Theexposurechambershallbedesignedsothatthetestconditionsdescribedinthesubsequentparagraphscanbeobtained,controlled,andmonitoredduringthetest.试验所需的永久性安装的设施包括一个可编程的高质量湿度箱。湿度箱中最好能配备一套喷量准确度高的综合性盐雾喷洒装置、冷却装置和一套性能良好的空气内循环系统（如图1）。曝露箱应按要求设计，以使下文所述的试验过程中的各项条件能在得到满足、控制和监控。Fig.1Schematicviewofaclimatechamberequippedwithfunctionssuitedforperformanceofthedescribedtestprocedure:1.Chambertestspace,2.Climatizationunit,includingfan,heating,coolingandhumidification,3.Testplanewithsamples,4.Temperature/humiditysensorforregulation,5.Insulatedwalls/lids,6.Diffusorsforimprovedairdistribution,7.Freshairinlet/"bleed",8.Rainrigwithnozzlesandmotorforswayingmode,9.Gutter,10.Control/steering/recordingunit,11.Positionformonitoring/calibrationofclimatewithindependenttemperature/humiditysensor.图1环境试验箱的图示，配备了进行本文所述的试验程序所需的功能： 1.试验空间；2.环境系统，包括风扇、加热器、冷却器和加湿器； 3.放置试样的平面；4.温湿传感器（调节用）； 5.隔热壁/盖；6.空气扩散器（改善空气分布）； 7.新鲜空气进气口； 8.带喷头和摇摆模式驱动马达的喷洒器； 9.排水口；10.控制/操作/记录系统；11.带独立温室感应器的环境监控 /校正位置。CLIMATECONTROL 环境控制Thehumidityandtemperaturelevelsofthechamberduringthetestcycleshallbecontinuouslymonitored.Thesensorsshouldreflecttheclimateconditionsinthetest"plane"(Fig.1,item4).Themeanvalueoftheconstanttemperature/relativehumidityclimateconditionsmustbewithinCand2%±relativehumidity(RH)respectivelyvs.thereal,setvalue,.thesearethemaxtolerablemeanoffsetscausedbythesumofcalibrationerrors.Atannualcalibrationthisdegreeofaccuracymustbefulfilledforthefollowingthreeconstantconditions:25C,95%RH,50C,95%RHand50C,70%RH.Atbimonthlycontrol,duringnormaloperation,thisaccuracyshouldbefulfilledattheconstantclimateconditions(50C,70%RH)duringawork-daycycle.试验过程中应连续不断地监控试验箱的湿度和温度水平。传感器会反映试验“平面”上的环境（如图1中第4项）。恒定温度/相对湿度的均值必须在±C范围内，相对湿度（RH）在±2%，分别对应实际值、设定值，这些就是由于累积的校正误差造成的平均偏移值的最大允许范围。在年度校正过程中，这一精确度必须得到满足，以保证以下三项恒定条件： 25C,95%RH,50C,95%RH以及50C,70%RH。在进行两月一次的正常控制时，工作日循环中的恒定环境条件（50C,70%RH）应能到达这一精度。Themaximumallowedshort-termfluctuationsinrelativehumidityoverlaidonthecalibratedmeanvalueis3%RH,whichimpliesamaximumallowedshort-termtemperaturefluctuationofC.Figure±2isexemplifyingtherequirementonrelativehumidity.叠加到校正平均值的相对湿度短期波动最大范围是3%RH。这意味着短期温度波动的最大范围只能是±C。图2举例说明了相对湿度的要求。ActualmeanRHvalueActualfluctuationaroundmeanRHvalue相对湿度实际均值相对湿度均值上下的实际波动SetRHvalue相对湿度设定值FigTrueness:.2AccuracyMaxallowedrequirementabsoluteonhumidityPrecision:deviationsMaxallowedfromsetvariationvaluecalibrationerror:2%RH

aroundactualmeanvalue:3%RH真实：最大允许的校正误差绝对值：20%RH

精确度：实际均值上下允许的最大变动范围是： 3%RH图2 湿度偏差离设定值的精确度要求Thechambercontrollingsoftware/hardwaremustbedesignedsothattherelativehumiditymaybechangedlinearlywithtimeasdepictedintheillustratedtestconditions,seeFigure5.Inthe2-stagerampingfromawetchamberat252Cto±humidconditionsat50C,70%RH,thefirstheatingstageto40Cshouldbereachedwithin30minuteswithoutsampledrying,whichissecuredbyanominalrelativehumiditysettingto95%RH.Thesecond2hrampmustreachthestipulatedfinal50C,70%RHattheendoftheramp.控制试验箱的软件/硬件必须设计成能使相对湿度随时间呈线性变化，如图5所示。从试验箱温度为25±2C的湿润状态到50C,70%RH的湿润状态需经过两个阶段。第一阶段应通过将相对湿度读数设定到95%RH，以保证温度在30分钟内达到40C而试样不干燥。第二阶段为两小时，必须在结束前达到规定的50C,70%RH。NOTE: Foreachnewexposuresituationthisconditionmustbeverifiedbyanindependentmonitoringdevice(paragraphwiththesensorpositionedamongtheactualtestobjectsintheiractualaverageplaneofexposure(Fig.1Item11).Formonitoring:Deploythesensordirectlyafterthelastsprayeventofthework-daywetphase.注意：每次曝露的条件必须经过独立监控设备验证（见第段），也就是实际试验物体所在的曝露平面之间的传感器（如图1，第11项）。在工作日湿润阶段的最后一次喷洒后直接调节传感器来进行监控。Inautomatedtesting,forcedcoolingisnecessarywhenproceedingfrom50C,70%RHcontrolled,constantconditionstomacro-wetconditionsat25C.Thechambermustachieveacoolingfrom50Cto30Cwithin30minuteswiththetargeted25Cmetwithin1hour.Ifsprayingisappliedmanually,thencoolingthesamplesbylettingthechamberbeopenwithtestobjectskeptwetmayprovideanoptionthatdoesnotrequiretheuseofabuilt-incoolingunit.Itmustbeverifiedbytemperaturemonitoringthatcoolingrequirementsarefulfilledundersuchconditionsfortheactualchambertypeandtestspecimenload.在自动试验过程中，要使试验箱从受控恒定条件50C,70%RH变化到25C下非常湿的条件，需要进行强制冷却。试验箱必须在30分钟内从50C冷却到30C，然后在1小时内到达目标温度25C。如果是手动喷洒，可以打开试验箱同时让试样保持湿润，这样就不必使用内置冷却系统。在这种条件下要满足该类试验箱和试样负荷的冷却要求，必须通过温度监控保证。RECOMMENDATIONSONTESTCHAMBERFUNCTIONALITY关于试验箱功能的建议Inordertomeetthetemperatureandhumidityaccuracyrequirementsthroughoutthetestarea,thechambershouldbeequippedwithmeanstoprovidewelldistributedcirculationofconditionedair(meaningalocalairvelocityofatleastafewcm/soverallpartsofthetestarea,-Fig.1isexemplifyingsuchacondition).Sufficientinsulationofthechamberwallsandlidsisrequiredinordertoavoidexcessivecondensationonthesesurfaces.Themoreefficientaircirculation,thelessinsulationisrequired.为了在整个试验过程中满足温度和湿度的精确度要求，试验箱应配备能使经调节温湿度、空气流动性好的装置（试验区域内各部分的内部气流速度至少是若干厘米/秒-例如图1。）试验箱的四壁和盖板要求得到有效隔热，以避免这些表面出现过渡冷凝。空气流动性越好，隔热需求越少。Wallheatingshouldbeavoided,duetothatheatingbyradiationtendstokeeptestobjectclosetothechamberwallslocallytoodrytobewithinhumidityspecification(orascreenshallbeinstalledtoavoidsuchaneffect).Providedtheinternalaircirculationisefficient,wallheatingisnotrequired.Thechamberairmustbecontinuouslyrenewedbyapurgeofnotlessthan1m3/hperm2oftestarea(exemplifiedbyFig.1,Item7).ThistoassurethattheCO2-levelisnotsignificantlydepletedunderanyexposureconditions.Freshaircanbeaddeddryfromacompressedsourceortakenfromambientconditions,unlesssignificantlypolluted(>50ppbSO2).由于热量辐射会使靠近箱壁的试样过度干燥，达不到湿度要求，因此应尽量避免试验箱壁受热（或者添加遮挡板来避免受热）。如果内部空气流动良好，就不必进行箱壁加热。应配备1m3/h每m2的空气净化器使试验区域内的空气不断更新（例如图1第7项）。这是为了保持CO2水平，避免其在曝露条件下被耗尽。干燥的新鲜空气可以由压缩机提供，或使用室内的空气（除非空气被严重污染（>50ppbSO2））。EXPOSURETOSALTSOLUTION 曝露到盐溶液中Forafullyautomatedprocedure,thechambershallbeequippedwithaspraydevicecapableofproducingafinelydistributed,uniformsprayfallingonthetestobjects.Themostreliablewayofreceivingafairlyuniformdownfallisbyinstallingamovingspraydevice,liketheswayingrailwithoverlappingnozzles,depictedinFig.3.Thesprayingdeviceshallbemadeofcorrosionresistancematerials.Plasticisrecommended.对于全自动的试验，试验箱内应配备喷洒装置，能使溶液得到妥善分配，均匀喷洒到试样上。最能有效使溶液均匀喷洒的方法是安装一套可移动的喷洒装置，如带交叉喷头的摇摆轨道，如图3所示。喷洒装置应由耐腐蚀材料制成，最好是塑料。Fig.3Exampleofsprayrigforobtaininguniformsaltsolutiondownfall.图3使盐溶液均匀喷洒的喷洒装置示例Atargetaverageprecipitationratedistributedovertheworkday6hwetperiodofthis2 2testprocedureperiodis5L/m,andshallnotexceed10L/m. Foranylocalposition2thetotalprecipitationoverthe6hperiodmustnotbelowerthan3L/mandnotexceed15L/m2.Suggestednozzlestype:SprayingSystemsUniJet800050VP.Mountthenozzlesonasupportingtube50-60cmapartandabout1mabovethetestobjects.Thenozzlesshallbeadjustedsothatthefanplumesareinlinewiththetube/supportingrail.Anindividualfilterateachnozzleisstronglyrecommendedtoavoidanycontaminationsinthetinyslots.Theselow-costplasticnozzleshaveareliablefunction,butmustbeinspectedinmicroscopeatdeliveryinordertodiscardsuchwithdefectslotcuts.Stainlessnozzles,evenin316alloy,willbeimpairedbycorrosionundertheactualtestconditions.Atomizingsalt-spraynozzlesshouldnotbeused,sincetheygenerateatoolowprecipitationratetogivesufficientleachingeffectonthetestobjects.Achievingauniformdownfallwiththesetypesofnozzlescanbedifficult.在本试验的工作日的6小时加湿阶段，平均喷洒密度的目标值为5L/m2，且不能超过10L/m2。在6小时周期内，箱内任何位置的喷洒密度都必须不低于3L/m2，不高于15L/m2。建议喷头类型：UniJet800050VP喷洒装置。将喷头装在支承管上，相隔56-60cm，处于试样上方1米左右。调整喷头，使扇叶与支承管/支承轨成一直线。强烈建议在给每个喷头装上过滤器，以避免小槽中的污染物。虽然这些喷头价格低廉、功能可靠，但是发货时还须经过显微镜检验，以淘汰那些小槽切割不良的喷头。不锈钢喷头，就算是用316合金制成的，在也会在实际试验条件下受到腐蚀而损坏。雾化盐雾喷头喷洒密度过低，无法为试样起到有效的过滤作用，故不宜使用。这几类喷头喷洒都不均匀。Anautomatedspray-rigisallowedtobeseparatedfromthehumiditychamber,.thetestobjectsaremovedbetweentwounitsonawork-daybasis.自动喷洒装置可从加湿箱中拆出来。也就是说，试样在一个工作日内在两套设备之间移动。Ifthereisnopossibilitytouseanautomateddeviceforspraying,amanualsprayingofthetestobjectisallowed,eitherinoroutsidethetestcabinet,provided:1.Theminimumprecipitationrateof5L/m2per6hwetsessionisfulfilled,2.Thesprayingeventsaredistributedoverthe6hperiod,sothatthetestobjectarekeptconstantlywet,and3.Thetemperaturerequirementisfulfilled.如果不能采用自动喷洒装置，可采用手动喷洒，在箱内箱外皆可，条件是：1.在6小时加湿阶段完成前，喷洒密度至少为5L/m2。2.喷洒将分布在6小时周期内，以使试样保持湿润；并且；3.保持要求的温度。NOTE: Saltsolutionsprayedontotestobjectsmustnotbereused.注意：喷洒到试样上的盐溶液不得重复使用。SAMPLEPREPARATION试样准备Samplepreparationbeforeexposure,thesampleorientationduringexposureandtheevaluationafterexposureareusuallystipulatedintheengineeringteststandardsaddressingthistestprocedure.曝露前试样准备，曝露期间的朝向和曝露后的评估方法一般会在本试验程序相关的工程试验标准中关于有所规定。Paintedandscribedpanels:ThetestisoptimizedforexposingscribesinhorizontalpositiononpanelsorientedComponentpartsaretobeinvehicleorientationpositionifatallpossible.Thesaltsolutionsprayshouldreachtheareasofinterest.如果可能，零部件应尽量按照汽车朝向放置，并使盐溶液能淋到达目标区域。Interestedpartiesshouldagreeonthelocationwithinthecomponentswherethecorrosionistobeobserved.相关各方需商定零部件上将出现腐蚀的位置。Interestedpartiesshouldagreetoanypre-conditioning,maskingofedges,pre-testing,cleaning,oranyothersamplepreparations.相关各方需商定预处理、要遮盖的边缘、预测试、清洁或其他试样准备工作。Interestedpartiesshouldagreetoanyphotographicdetailsthroughoutthetestandtheareastobeexaminedandanyassessmentsthatarerequired.相关各方需商定试验过程的具体细节、检测的区域以及要求的评估。OPERATION操作BEFORETESTSTART 试验开始之前Preparetestobjectsaccordingtotheinstructionsinparagraph4,whichmayincludeadditionalprocedures,likepreconditioninginothertestequipments.heattreatment).按照第4段的说明准备试样，也许将包括附加步骤，如在其他试验设备中进行预处理（比如热处理）。Testobjectorientation:Componentsortestobjectsinthechambershallbeplacedon/mountedtonon-corrosivesurfacesintheappropriateagreeduponposition.Iftheitemisflatthetestsurfaceshallbewithinan15-20anglefromvertical.Notethattheinclinationdeterminestheamountofwetnesscollectedonthepanelandhence,thesaltloadwhenthisfilmissubjectedtoclimatecontrol,whichinturninfluencesthetestresult.试样的朝向：试验箱中的零部件或试样应按照商定的朝向，放置或固定在防腐蚀的表面上。如果试样是平的，那么试验表面应在离垂直线15-20角度范围内。请注意，板的倾角决定了溶液的收集量，从而影响试验片受环境控制时的盐负荷，进而影响试验结果。Testobjectsupport:Ifitisnecessarytosuspendtheobjects,thematerialusedshallbemadeofnon-metallicinertmaterials.Theteststandsmustnotobstructpassingofair,nordisableproperdrainage(Thephotoinfig.4showsanexampleofopenwell-drainedsupportsforflatpanels)试样的夹具：如需将试样托起，夹具应采用非金属的惰性材料，而且不得阻碍空气流通或排水（图4就是一个开放且排水畅通的平板试样夹具）。Testobjectexposuretosaltspray:Thecomponentortestobjectshallbeplacedapproximately1mfromthesprayheadsifanautomatedsprayrigisused.Flatsamplesinangledpositionmusthavetheirfullhorizontallyprojectedsurfaceexposedtospraycollection(seedrawinginfig.4).Thiswillalsosupportasufficientaircirculationaroundthepanels.Othertestobjectsgeometriesthanflatpanelsmustobeythesecriteriaasfaraspracticallyfeasible.试样曝露到盐雾中：如使用自动喷洒装置，零部件或试样应放置在离喷头1米左右的位置。按一定角度放置的平试样必须让其水平投影面完全曝露到喷洒液体收集区域（见图4）。这还有助于板周围的空气流通。对于平板以外其他几何形状的试样，只要能实际操作，都必须遵循这些标准。Fig.4Exampleofopenandwelldrainedfixturesforflattestpanels(left)andminimumrecommendedstackingdistanceofpanels(right)图4适用于平板试样的开放且排水畅通的夹具（左图）；建议最小板间距（右图）Durationoftest:Thenumberoftestcyclesshallbedeterminedbythespecificationcoveringthecomponentorobjectbeingtested.Whennotspecified,thetestperiodshallbeagreedbytherequesterandthecorrosiondepartment.试验持续时间：试验循环次数应由试样零部件或试样相关要求决定。如果没有要求，应由申请试验的一方和负责研究腐蚀的部门商定试验周期。Controlbeforeteststart:Runandmonitorthetestcycleatleasta24hperiodbeforestartingthetest,providednotalreadyincontinuousoperation.试验开始前的控制：假如持续运行尚未开始，在试验开始之前先运行并监控试验循环至少24小时。Startandendtimeoftest:Thetestisonlyallowedtobestartedjustbeforethefirstprecipitation(TableIStep1A)intheweeklyscheme,.attheendofthe"weekend"constanttemperature/humidityphase.Thetestisendedattheendoftheweekendhumidityexposure.试验的启动时间和结束时间：本试验只允许在一周计划中的第一次喷洒（见表1，步骤1A）之前启动，即“周末”恒温恒湿阶段结束时。试验在周末加湿曝露阶段结束。TESTEXPOSURECONDITIONS 试验曝露条件Therearethreebasicexposuremodesinthedailytestscheme:每日试验计划分三种基本曝露模式：Acontinuouswetphaseat252Cwherethetestobjectsareexposedtoa%NaClsolution.Thewetconditionismaintainedbyintermittentsprayexposureandwithatemperaturecontrolwithoutdrying,orwiththehumiditycontrolsethighenoughtonotcauseanypracticaldrying.252C持续湿润阶段，在此阶段试样曝露到%的氯化钠溶液中。通过间歇喷洒曝露和温度控制（不干燥），或调节湿度控制（足以防止物体干燥），试样的湿润状态得以保持。Atwo-steptransitionfromwettocontrolledhumidityclimate.从湿润到受控湿度环境的两步过渡。3.Aperiodunderconstanttemperature/humiditycontrol;50Cand703%RH.Thisisalsotheconditionduringweekend.3.恒温恒湿控制周期：50C，703%RH。这也是周末的环境状态。Table1. Climateprogram,stepbystepinautomatedmode表1环境表，自动模式的各个步骤StepTimeDurationClimatesettingsat步骤elapsedofstepstartofstep耗时步骤持初始环境设定续时间Comments备注nohmhmT(C)%RHm1a00010*50*1b10002030-501a'30003<301c332027<301a'003325±21c'3235425±21a'5705325±22a0063025±22b30260040±3a301583050±3a00-24-50±Repeatsteps1a-3aanotherfourtimes3b 00 48

Spraythoroughly%NaCltowetand70*cool%氯化钠，湿透且冷却CoolchamberwithmaximumcapacityWet最大限度冷却试验箱Spraytoregainwetness(coolingdries)Wet通过喷洒使干冷的试验箱再次湿润25±2tobereachedwithin1hfromstart(1a)wet(95)从步骤1a开始，一小时内达到25±2Secureandsupportwetnessbysprayingwet通过喷洒保持湿润wet(95)=OKtosetto95%RHwet(95)湿度（95）=可以设置到95%RHDefineswetconditionbeforeclimatecontrolwet环境控制前明确湿工况Startofquicktemperaturerisewithoutdryingwet(95)开始快速加温，但不能干燥Startofslowdryingbydiffusionwet(95)通过扩散，开始缓慢干燥Panelsshallbefreefromvisiblewetness70±3板上无可见水迹Endof"workday"procedure70±3“工作日”程序结束步骤1a-3a再重复4次120880050±70±383b00-168-50±70±3Repeatsteps1a-3bforrequirednumberofweeks

Phaseinwithweekendsincaseofmanualoperationsin"workday"procedure假如“工作日”程序是手动操作，则在各个周末逐步进行步骤1a-3b重复次数按各周要求*Providedproceedingfromstep3aor3b 假如从3a或3b开始进行1001a1a'1a'1a'1b1c1c2a902b)H80R%(.70m3au温度°C/相对H60l湿度eR/(%RH)--50)C3a*(2bp40me2aT3012006121824Exposuretime(h)曝露时间（小Fig.5Workday.)testcycle图5工作日（一至五）试验循环温度°C/相对湿度(%RH)

1009012a)2bH80R%(.70m3a3buH.60eR/--50)C*(p40meT3020024487296120144168Exposuretime(h)曝露时间（小时）Fig.6Completeweeklyprogram. 图6完成每周计划Operationswithinthewetphaseat252C: ±在25±2C湿润阶段的操作Exposureto%±NaClsolutionshallbeperformedatleastinthebeginning,middleandattheendofthe6hwetphase.在6小时湿润阶段的开始、中端和结束时至少各进行一次 ±%的氯化钠溶液曝露。Inautomatedmode,thefirsteventmayconsistofalongerperiodofspray(1a-upto10minutes)inordertocoolthesamplesandthechambermoreefficientlyfromthe50C,70%RHcondition.Ifalltestoperationsareperformedwithinthesameclimatechamber,itisessentialtofollow-upwithefficientcoolingafterthefirstsprayevent,inordertoreachatemperaturebelow30Cwithinthefirst30minutesofthewetphase(1b).Aftersuchcooling,whichimpliessomedrying,itisrecommendedtohaveanothershortsprayeventtoassurethatthesolutiononthepanelshavethestipulatedconcentration(1a'inTable1/Fig.5)Thefinaltargetedtemperatureof252C±shallbereachedwithinthefirsthour.在自动模式下，第一次喷洒时间会长一些（1a-10分钟），以使试样和试验箱从0C,70%RH的状态下更有效地冷却。如果所有试验操作都是在同一个试验箱中进行，第一次喷洒后的有效冷却非常重要，需要在湿润阶段（1b）的头30分钟内将温度降到30C以下。冷却过后（意味着一定程度的干燥），建议进行一次短时间喷洒以保证板上的溶液达到规定的浓度（图5/表1中的1a）第一个小时内达到最终的目标温度 25±2C。Inanexposurecasewherethesprayisappliedmanuallyintoastay-openchamber,orthesamplesaremovedtoanotherchamberorlabbenchforsprayingatwetphaseexposure,coolingwithinthestipulatedtimeisusuallynotaproblem.Notethatthesprayingconditionsdescribedinshallapply.Duringtheremainingtimeofthewetphase(1c),thesamplesmustnotdrysignificantly.Thisisaccomplishedbysecuringthatthetemperaturecontrolismaintainedwithoutsignificantremovalofhumidifiedair.Ifthewetphaseisperformedinatroughonabenchorinanunheatedchamber,itmaybesufficienttojustkeepthepanelsinaclosedvolumebetweenthesprayevents.Inthefullyintegratedtestcondition,theclimatecontrolcanbesetto25C,95%RH,whichsecuresagainstanysignificantdrying,withouttheriskofsupplyinghumidity,whichmightoccurifthehumidityissetto.99%RH.Theshortsprayeventafterapproximately3h(1a')renewsthewetfilmonthesamplesandsecuresagainstdrying.Thefinalsprayevent(1a')istoassureconsistentstartingconditionswhenenteringthetransitiontocontrolledhumidityclimate.假如是在敞开的试验箱里进行手动喷洒或者是将试样转移到其他试验箱或试验台上进行湿润阶段曝露，在规定时间内冷却一般不成问题。注意，应当按照第段所述的喷洒条件进行。在湿润阶段（1c）剩余的时间里，不能让试样干燥。为保证这一点，可以保持温度而不大幅减少加湿空气。假如湿润阶段是在试验台上的水槽中进行，或者在未加热的试验箱中进行，仅仅在喷洒的间歇期间保持密封也许就足够了。在综合的试验条件下，环境控制可以设置成25C,95%RH。这样可以保证试样不干燥，毕竟当湿度设置为99%RH时加湿可能失效。大约3小时（1a’）后，需进行短时间喷洒以加强试样表面的保湿层，避免干燥。最后的喷洒（1a’）是为了在进入控制环境湿度的过渡阶段保证初始状态一致。Note2:Continuoussprayingwithatomizingsalt-fogtypenozzlesisnotanoption.注意2：不得使用雾化盐雾喷头进行持续喷洒。Transitiontocontrolledhumidityconditions:过渡到受控湿润状态：Forbothfullyandpartlyprogrammableprocedures,rampupfrom25Candnominallyset95%RHto40C,95%RHduring30min,whichmeansthatwetconditionswillprevail(2a).Slowlydrythewetcorrodingsurfacesgoingfrom40C,andset95%RHto50C,70%RHfor2h(2b).Atthefinalcontrolledclimateconditionsthereshallbenovisiblewetnessonanycorrodingsurfaceandtheactualvaluesmustbewithinthesetallowedlimits.Thereasonforthistwo-stepprocedurewithaquicktemperaturerisefollowedbyslowdryingatcomparablyhighhumidityistofavordryingbydiffusionratherthandryingbyconvection,sincethelattervariesconsiderablybetweendifferenttypesofcabinets.Suchvariabilityislikelytohaveconsiderableimpactonthetestresult.对于完全或部分可编制的程序，30分钟内从25C，读数为95%RH，加温到40C,95%RH，意味着湿润状态会占上风（2a）。2小时内（2b）将湿润腐蚀的从40C，95%RH，干燥到50C,70%RH。在最终控制的环境状态下，腐蚀表面不应再有水迹，而且实际数值必须在允许范围内。采取两步操作，即快速升温然后在相对较高的湿度下缓慢干燥，是因为在于扩散干燥比对流干燥好，后者在不同的试验箱里差别很大。这种差别有可能严重影响试验结果。Note3: Thetransitions1band2a/bareessentialtoinsureconsistenttestqualityattheactualchamberspecimenload.Ifthechamberhumiditysensorisnotpositionedclosetothesamples,independentmonitoringinthesampletestplaneshouldbeaccomplishedaccordingtosection注意3：1b和2a/b的过渡对于保证试验质量的一致性是必不可少的。如果试验箱内的湿度传感器并不靠近试样，根据章节所述，应在试样测试平面上配备独立监控。Constantclimateconditionsof50C,70±3%±RHwillprevailuntila24hcycleisfulfilled,.forh.(3a)Theseconstantexposureconditionsareprolongedduringth"weekends",.thelast48hoftheweekcycle(3b)afterfinalizingthe5"workday"cycle.恒定状态50±C,70±3%RH将持续至24小时循环完成，即持续小时（3a），而在“周末”计划中将持续更长时间：即完成第5个“工作日”循环后，周循环（3b）持续48小时。AFTEREXPOSUREStorage:Forcorrodedsamplesofsteelbaseoraluminumitisimportanttoevaluatethesamplesnomorethanaweekafterfinishedtest,ifkeptinambientconditions.Otherwisetestspecimenshouldbekeptindesiccators.曝露后保存：对于铁制或铝制腐蚀试样，如果保存在一般环境中，应在试验完成一周内进行对试样进行评估，否则应将试样保存在干燥器中。QUALITYCONTROLWorkdaycontrol:Checkthatthemonitoredtemperatureandhumidityvaluesareinaccordancewithsetvalues.?

质量控制?

工作日控制：? 检查确认温度值和湿度值符合设定值Weeklycontrol:Checkthatthespraynozzlesdelivertheintendeduniformspraypatternandthatthesprayrigworksproperly.? Checkthatthesaltsolutioniswithin+%bywt.ofNaClsolution,mostconvenientlywithaconductivitymetermS/cm).Useareferencestandardsolution.Withthestipulatedwaterquality(paragraphpHisnotsubjectedtocontrol.Checkstoragetanksandothersupplysources.? 周控制：检查确认喷头能均匀喷洒，喷洒装置运转正常。通过称量氯化钠溶液，检查确认盐溶液在+%范围内，最便捷的方法是使用电导仪mS/cm)。使用参考标准溶液，规定的水质（见第段）PH不受控制。检查储存罐和其他供应源。Bimonthlycontrol:? Monitortheclimatewithanindependentcontroldevice(paragraphduringtestoperationbyplacingthedeviceinthechambertestplanejustafterthelastsprayofawetphaseandremoveitbeforethefirstsprayofthenextwetevent.?

两月一次的控制：?

在试验过程中使用独立控制设备监控环境（见第段），即在最后一次湿润阶段喷洒过后将该设备放到箱里的试验平台上，然后在下一次加湿喷洒之前撤走。Annualcalibration:? Cleanandservicethecompleteequipment? Monitortheclimatewithanindependentcontroldeviceatthethreedifferentsettingsgiveninparagraph.? Checkthatthesaltsolutionspraydow