STD-423-0010-人造气氛腐蚀试验-盐雾试验

VOLVOStandardSTD423-0010VolvoGroupEstablishedApril2004Version1Page1(13)Corrosiontestinartificialatmospheres-saltspraytestsOrientationAstoitstechnicalcontentthisstandardconformstoSS-ISO9227:1990Corrosiontestinartificialatmospheres-Saltspraytests,andASTMB117regardingNSStestandXPA05-109.ThisstandardisafurtherdevelopmentofthepreviouslyissuedstandardSTD5711,102,issue3.Contents1Scopeandfieldofapplication2Testsolutions2.1Preparationofthesodiumchloridesolution2.2pHadjustment2.2.1NSStest2.2.2AASStest2.2.3CASStest2.3Filtration3Apparatus3.1Spraycabinet3.2Heaterandtemperaturecontrol3.3Sprayingdevice3.4Collectingvessel3.5Re-useofapparatus4Methodforevaluatingthecorrosivityofthechamber4.1NSStest4.1.1Referencetestpieces4.1.2Arrangementofthereferencetestpieces4.1.3Determinationofmassloss4.1.4CheckingofNSSapparatusoperation4.2AASStest4.2.1Electrolyticcoating4.3CASStest4.3.1Referencetestpieces4.3.2Arrangementofthereferencetestpieces4.3.3Determinationofmassloss(massperunitarea)4.3.4CheckingofCASSapparatusoperation5Testpieces6Arrangementofthetestpieces7Operatingconditions8Durationoftest9Treatmentoftestpiecesaftertest10Evaluationofresults11Testreport人造气氛腐蚀试验－盐雾试验目标本标准的技术内容与SS-ISO9227:1990人造气氛腐蚀试验－盐雾试验，ASTMB117，XPA05-109相符合。本标准相对STD5711,102而言有了更进一步的发展。目录1范围和应用领域2试验溶液2.1氯化钠溶液配制2.2PH调整2.2.1NSS试验（中性盐雾试验）2.2.2AASS试验（乙酸盐雾试验）2.2.3CASS试验（铜加速乙酸盐雾试验）2.3过滤3实验设备3.1喷雾箱3.2加热系统3.3喷雾装置3.4收集装置3.5再利用设备4评价喷雾箱腐蚀性的方法4.1NSS试验（中性盐雾试验）4.1.1参照试样4.1.2参照试样的放置4.1.3测定质量损失4.1.4检验NSS装置4.2ASSS试验（乙酸盐雾试验）4.2.1电解涂层4.3CASS试验（铜加速乙酸盐雾试验）4.3.1参照试样4.3.2参照试样的放置4.3.3测定质量损失（单位面积的质量）4.3.4检验CASS装置5试样6试样放置7试验条件8试验周期9试验后试样处理10试验结果评价11试验报告VOLVOStandardSTD423-0010VolvoGroupEstablishedApril2004Version1Page2(13)1ScopeandfieldofapplicationThisstandardspecifiestheapparatus,thereagentsandtheproceduretobeusedinconductingtestsinneutralsaltspray(NSS),aceticacidsaltspray(AASS)andcupreousaceticacidsaltspray(CASS)forassessmentofthecorrosionresistanceofmetallicmaterialswithorwithoutpermanentortemporarycorrosionprotection.Italsodescribesthemethodemployedtoevaluatethecorrosivityofthetestcabinetenvironment.Itdoesnotspecifythedimensionsofthetestpieces,theexposureperiodtobeusedforaparticularproduct,ortheinterpretationofresults.Suchdetailsareprovidedintheappropriateproductspecifications.Thesaltspraytestsareparticularlyusefulfordetectingdiscontinuitiessuchasporesandotherdefects,andforevaluatingthecorrosionresistanceincertainmetallic,anodicoxideandconversioncoatings.Theneutralsaltspray(NSS)testappliesto:－metalsandtheiralloys－certainmetalliccoatings(anodicandcathodic)－certainconversioncoatings－certainanodicoxidecoatings－organiccoatingsonmetallicmaterialsTheaceticacidsaltspray(AASS)testisespeciallyusefulfortestingdecorativecoatingsofcopper+nickel+chromiumornickel+chromium.Ithasalsobeenfoundsuitablefortestinganodicoxidecoatingsonaluminium.Thecupreousaceticacidsaltspray(CASS)testisusefulfortestingdecorativecoatingsofcopper+nickel+chromiumornickel+chromium.Ithasalsobeenfoundsuitablefortestinganodiccoatingsonaluminium.2Testsolutions2.1PreparationofthesodiumchloridesolutionDissolveasufficientmassofsodiumchlorideindistilledordeionizedwaterwithaconductivitynotexceeding20μS/cmat25°C±2°Ctoproduceaconcentrationof50g/l±5g/l.(Theratiois95partswaterand5partssodiumchloride.)Thesodiumchlorideconcentrationofthesprayedsolutioncollectedfromthedownfallingmistshallbe50g/l±5g/l.Thedensityfora50g/l±5g/lsolutionvariesbetween1,0255and1,0400at25°C.1范围和应用领域本标准规定了中性盐雾(NSS)，乙酸盐雾(AASS)和铜加速乙酸欲雾(CASS)试验使用的设备、试剂和方法。本标准也规定了评估试验箱环境腐蚀性的方法。未规定试样尺寸，特殊产品的试验周期和结果解释，这些内容参见相应的产品规范。本标准适用于评价金属材料及覆盖层的耐蚀性，被测试对象可以是具有永久性或暂时性防蚀性能的，也可以是不具有水久性或暂时性防蚀性能的。在中性盐雾试验中适用于－金属及其合金－金属覆盖层－转化膜－阳极氧化膜－有机覆盖层乙酸盐雾试验适用于铜+镍+铬或镍+铬装饰性镀层，也适用于铝的阳极氧化膜。铜加速乙酸盐雾试验适用于铜+镍+铬或镍+铬装饰性镀层，也适用于铝的氧化膜。2实验溶液2.1氯化钠溶液配制将氯化钠溶于电导率不超过20μS/cm的蒸馏水或去离子水中，在25°C±2°C时浓度为50g/l±5g/l（该比率为95份水和5部分氯化钠）。氯化钠的收集浓度在50g/l±5g/l。在25°C.时配制的溶液密度在1.0255~1.0400范围内。VOLVOStandardSTD423-0010VolvoGroupEstablishedApril2004Version1Page3(13)Thesodiumchlorideshallcontainlessthan0,001%(m/m)copperandlessthan0,001%(m/m)nickelasdeterminedbyatomicabsorptionspectrophotometryoranotheranalyticalmethodofsimilarsensitivity.Itmustnotcontainmorethan0,1%(m/m)sodiumiodideormorethan0,5%(m/m)totalimpuritiescalculatedfordrysalt.NOTE-IfthepHofthepreparedsolution,measuredat25°C±2°C,isoutsidetherange6,0-7,0,thepresenceofundesirableimpuritiesinthesaltand/orthewatershallbeinvestigated.2.2pHadjustmentAdjustthepHofthesaltsolutiontothedesiredvalueonthebasisofthepHofthesprayedsolutioncollected.2.2.1NSStestAdjustthepHofthesaltsolution(2.1)sothatthepHofthesprayedsolutioncollectedwithinthetestcabinet(3.1)isbetween6,5and7,2.CheckthepHusingelectrometricmeasurementat25°C±2°C.Inroutinechecks,ashort-rangepHpaperwhichcanbereadinincrementsof0,3pHunitsorlesscanbeused.Whenusingelectrometricequipmentwaituntilitisstable.Makeanynecessarycorrectionbyaddinghydrochloricacidorsodiumhydroxidesolutionofanalyticalgrade.PossiblechangesinpHmayresultfromlossofcarbondioxidefromthesolutionwhenitissprayed.Suchchangesmaybeavoidedbyreducingthecarbondioxidecontentofthes