作者:标准资料网 时间:2024-05-10 09:40:59   浏览:9809   来源:标准资料网

【英文标准名称】:StandardPracticeforTestingWaterResistanceofCoatingsin100%RelativeHumidity
【原文标准名称】:在100%相对湿度条件下测定涂层耐水性能的标准实施规程
【标准号】:ASTMD2247-2011
【标准状态】:现行
【国别】:
【发布日期】:2011
【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】:D01.27
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:粘附;起泡;湿度;水阻力;锈蚀
【英文主题词】:adhesion;blistering;humidity;resistance-water;rust
【摘要】:Watercancausethedegradationofcoatings,soknowledgeofhowacoatingresistswaterishelpfulforassessinghowitwillperforminactualservice.Failureintestsat100%relativehumiditymaybecausedbyanumberoffactorsincludingadeficiencyinthecoatingitself,contaminationofthesubstrate,orinadequatesurfacepreparation.Thispracticeisthereforeusefulforevaluatingcoatingsaloneorcompletecoatingsystems.Testsat100%relativehumidityareusedforspecificationacceptance,qualitycontrol,andresearchanddevelopmentforcoatingsandsubstratetreatments.Sometestsareusedforapassorfaildeterminationatanarbitrarytime.Acoatingsystemisconsideredtopassifthereisnoevidenceofwater-relatedfailureafteraperiodoftime.Othertestsareusedtomonitordegreeoffailureasafunctionofexposuretime.Arbitrarypass/faillevelsandthetestdurationsrequiredaretypicallysetinothermaterialspecifictestmethods.Usersofthispracticealonemayusetheknownperformanceofthecontrolstosettestendpoints.Anotheroptionistocontinuethetestuntilallspecimenshavefailed,andusethetimetoreachfailureasawaytodifferentiateperformance.Resultsobtainedfromtheuseof100%humiditytestsinaccordancewiththispracticeshouldnotberepresentedasbeingequivalenttoaperiodofexposuretowaterinthenaturalenvironment,untilthedegreeofquantitativecorrelationhasbeenestablishedforthecoatingorcoatingsystem.Thetestchambercanbeasmalllaboratorycabinetoraroomlargeenoughtoholdanautomobileoratruck.Someautomobilemanufacturerstestcompletedvehiclesinroomsmaintainedat100%relativehumidity.Corrosiontestscanbeconducted,asthecondensatedrippingoffthetestarticlesinnotrecirculated.1.1Thispracticecoversthebasicprinciplesandoperatingproceduresfortestingwaterresistanceofcoatingsbyexposingcoatedspecimensinanatmospheremaintainedat100%relativehumiditysothatcondensationformsonthetestspecimens.1.2Thispracticeusesthetechniqueofcreatingaslighttemperaturedifferentialwithintheexposureareatoformcondensationonthecoatedspecimens.Asthewarmersaturatedairpassesthecoolerspecimens,waterisdepositedontothespecimensintheformofcondensation.1.3Thispracticeplacestheentirespecimenintheexposureareaallowingcondensationtoformonallsurfaces.Thismakesthispracticesuitableforflatpanelsaswellaslargeor3Dobjects.Thispracticediffersfromothermethodswherecondensationisonlyformedonthefrontcoatingsurface,butthebacksurfaceisoutsidetheexposurearea.Othertestsmayalsodepositwaterdropletsonthesurfacebutwherethesourceisnotfromcondensation.Note18212;AlternativepracticesfortestingthewaterresistanceofcoatingsincludePracticesD870,D1735,andD4585.1.4Thispracticeislimitedtothemethodsofobtaining,measuring,andcontrollingtheconditionsandproceduresoftestsconductedin100%relativehumidity.Itdoesnotspecifyspecimenpreparation,orevaluationofresults.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriate......
【中国标准分类号】:
【国际标准分类号】:87_040
【页数】:7P.;A4
【正文语种】: