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【英文标准名称】:StandardPracticeforMeasurementofThicknessofAppliedCoatingPowderstoPredictCuredThickness
【原文标准名称】:测量实用涂层粉末预固化厚度的标准实施规程
【标准号】:ASTMD7378-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:D01.51
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:角度测量;涂层;尺寸计量;线性测量;测量;计量学;粉末;表面特性;厚度
【英文主题词】:coatingpowder;coatingthickness;filmthickness;powdercoating;powderthickness;thicknessprediction;ultrasonic
【摘要】:Manyphysicalandappearancepropertiesofthefinishedcoatingareaffectedbythefilmthickness.Filmthicknesscanaffectthecolor,gloss,surfaceprofile,adhesion,flexibility,impactresistanceandhardnessofthecoating.Thefitofpiecesassembledaftercoatingcanbeaffectedwhenfilmthicknessisnotwithintolerance.Thereforecoatingsmustbeappliedwithincertainminimumandmaximumfilmthicknessspecificationstooptimizetheirintendeduse.Allproceduresinvolvetakingmeasurementsofappliedcoatingpowdersinthepre-cured,pre-gelledstatetohelpinsurecorrectcuredfilmthickness.Thisenablestheapplicationsystemtobesetupandfine-tunedpriortothecuringprocess.Inturn,thiswillreducetheamountofscrapandover-spray.Accuratepredictionshelpavoidstrippingandre-coatingwhichcancauseproblemswithadhesionandcoatingintegrity.Measurementsofcuredpowdercoatingthicknesscanbemadeusingdifferentmethodsdependinguponthesubstrate.Non-destructivemeasurementsovermetalsubstratescanbemadewithmagneticandeddycurrentcoatingthicknessgages(seePracticeD7091).Non-destructivemeasurementsovernon-metalsubstratescanbemadewithultrasoniccoatingthicknessgages(seeTestMethodD6132).Destructivemeasurementsoverrigidsubstratescanbemadewithcross-sectioninginstruments(seeTestMethodD4138).1.1Thispracticedescribesthethicknessmeasurementofdrycoatingpowdersappliedtoavarietyofsubstrates.Useofsomeoftheseproceduresmayrequirerepairofthecoatingpowder.Thispracticeisintendedtosupplementthemanufacturersinstructionsfortheoperationofthegagesandisnotintendedtoreplacethem.Itincludesdefinitionsofkeyterms,referencedocuments,thesignificanceanduseofthepractice,andtheadvantagesandlimitationsoftheinstruments.1.2Threeproceduresareprovidedformeasuringdrycoatingpowderthickness:1.2.1ProcedureA-Usingrigidmetalnotched(comb)gages.1.2.2ProcedureB-Usingmagneticoreddycurrentcoatingthicknessgages.1.2.3ProcedureC-Usingnon-contactultrasonicpowderthicknessinstruments.1.3Coatingpowdersgenerallydiminishinthicknessduringthecuringprocess.Theseproceduresthereforerequireareductionfactorbeestablishedtopredictcuredfilmthicknessofpowdercoatings.1.4ProcedureAandProcedureBmeasurethethickness(heightordepth)oftheappliedcoatingpowdersinthepre-cured,pre-gelledstate.Bycomparingresultstothemeasuredcuredpowderthicknessinthesamelocation,areductionfactorcanbedeterminedandappliedtofuturethicknessmeasurementsofthesamecoatingpowder.1.5ProcedureCresultsinapredictedthicknessvaluebasedonacalibrationfortypicalcoatingpowders.Ifthepowderinquestionisnottypicalthenacalibrationadjustmentcanbemadetoaligngagereadingswiththeactualcuredvaluesasdeterminedbyothermeasurementmethods.1.6ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:A29
【国际标准分类号】:17_040_20
【页数】:5P.;A4
【正文语种】: