2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、Designation:D4940?10StardTestMethodfConductimetricAnalysisofWaterSolubleIonicContaminationofBlastingAbrasives1ThisstardisissuedunderthefixeddesignationD4940thenumberimmediatelyfollowingthedesignationindicatestheyearofigi

2、naladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thistestmethoddescribesaprocedurefr

3、apidevaluationofabrasivesfthepresenceofioniccontaminationbydeterminingthetotalconcentrationofwatersolubleioniccontaminantsbymeansofaconductivitytest.1.2Thistestmethoddoesnotidentifytheionicspeciespresentnprovidequantitat

4、iveresultsoneachspecies.1.3Thistestmethodisbasedonavolumecomparisonamongabrasivesofsimilarsizes.Avolumecomparisonismecloselyrelatedtosurfaceareaoftheabrasivesthanisaweightcomparison.1.4ThevaluesstatedinSIunitsaretoberega

5、rdedasstard.Nootherunitsofmeasurementareincludedinthisstard.1.5Thisstarddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthprac

6、ticesdeterminetheapplicabilityofregulatylimitationspritouse.2.ReferencedDocuments2.1ASTMStards:2D1193SpecificationfReagentWaterE832SpecificationfLabatyFilterPapers2.2OtherStard:ISO111276PreparationofSteelSubstratesbefeAp

7、plicationofPaintsRelatedProductsTestMethodsfNonMetallicBlastCleaningAbrasivesPart6:DeterminationofWaterSolubleContaminantsbyConductivityMeasurement32.3SSPC:TheSocietyfProtectiveCoatingsSSPCAB1SpecificationfMineralSlagAbr

8、asives43.SummaryofTestMethod3.1Abrasivepurewaterarecombinedintoaslurrythatisstirredtoleachthesolublesaltsfromtheabrasive.Thisslurryisfilteredconductanceofthefiltrateismeasured.Theconductivitywhichisrelatedtotheconcentrat

9、ionofsolubleionicmaterialscontaminatingtheabrasivesurfaceiscalculatedfromtheconductancethecellconstant.4.SignificanceUse4.1Byproductabrasivesmanufacturedfromslagsthatareaircooledquenchedwithpurewaternmallycontainlowconce

10、ntrationsofionicmaterialsasdominedmineralabrasives.Howeverslagsquenchedwithseawaterothercontaminatedwatercontainhighamountsofionicmaterialasdoesseashes.Thiscontaminationoftheabrasivecantransfertothesteelsurfacesbeingblas

11、tedwhereitmayacceleratecrosion.Thistestisusefulinestablishingthecleanlinessoftheabrasiveatthejobsite.4.2Thistestmethodprovidesavaluethatindicatestheconcentrationoftotalwatersolubleionsbasedontheirelectrolyticmobility.Thu

12、sitprovidesanindicationofioniccrosionpotential.NOTE1—Atypicalvalueofconductivityfahighlevelofcontaminationis500mhocm.Atypicalvaluefalowlevelofcontaminationis50mhocm.5.Apparatus5.1ConductivityBridgeCell—Anycommercialcondu

13、ctivitybridgeconductivitycelltypicallyhavingarangeofatleast5mhocmto10000mhocmissatisfacty.Eitheradiptypepipettypecuptypecellmaybeused.Ameansofadjustingftemperaturecontrollingthetemperatureisessential.Whilesomeinstruments

14、haveanadjustmenttocompensateftemperature(automatictemperaturecompensation)onemeansistousea25Cconstanttemperaturebath.1ThistestmethodisunderthejurisdictionofASTMCommitteeD01onPaintRelatedCoatingsMaterialsApplicationsisthe

15、directresponsibilityofSubcommitteeD01.46onIndustrialProtectiveCoatings.CurrenteditionapprovedJune12010.PublishedJune2010.iginallyapprovedin1989.Lastpreviouseditionapprovedin2003asD494098(2003).DOI:10.1520D494010.2Frefere

16、ncedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3AvailablefromAmericanNationalStardsInstitute(ANSI)25W.43

17、rdSt.4thFloNewYkNY10036:www.ansi.g.4AvailablefromSocietyfProtectiveCoatings(SSPC)4024thSt.6thFloPittsburghPA152224656:www.sspc.g..Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStat

18、es19.1.4Rinsetheconductivitycellinreagentwateruntiltherinsewaterisacleanlinessof5.0mhocmless.9.1.5Rinsetheconductivitycelltwothreetimeswiththefiltratethendetermineconductanceat25Cinaccdancewiththeoperatinginstructionsoft

19、heinstrument.Usesuccessiveptionsofthesampleuntilaconstantvalueisobtained.10.Calculation10.1Calculatethespecificconductivityoftheabrasiveasfollows:Cs5Cm3K25(2)11.Rept11.1Reptthefollowinginfmation:11.1.1Thecalibrationvalue

20、ofthecellconstant(bothasmeasuredaspredeterminedsuppliedwiththeconductivitycell)thedatethenameofthepersoncheckingthecalibration.11.1.2Thematerialdatereadingsmeaninmhocmalongwithnameofpersonconductingthetestsidentification

21、oftheapparatus.12.PrecisionBias612.1Precision—Onthebasisoffivereplicateinterlabatytestsofthistestmethodinwhichthreeoperatsinthreelabatiesanalyzedinduplicatesixblastingabrasivescontainingionogeniccontaminationthewithinlab

22、atycoefficientofvariation(afterrejectingresultsfromonesetofreplicatetestsasoutliers)wasfoundtobe1.7%with20degreesoffreedom(df)thebetweenlabatystarddeviationcoefficientofvariationwasfoundtobe7.4%with15df.Basedonthesecoeff

23、icientsthefollowingcriteriashouldbeusedfjudgingtheacceptabilityofresultsatthe95%confidencelevel:12.1.1Repeatability—Tworesultseachthemeanoftworunsobtainedbythesameoperatshouldbeconsideredsuspectiftheydifferbymethan5%rela

24、tive.12.1.2Reproducibility—Tworesultseachthemeanoftworunsobtainedbyoperatsindifferentlabatiesshouldbeconsideredsuspectiftheydifferbymethan22%relative.12.2Bias:12.2.1Biascanbepresentbecauseofthemobilityofvariousions.Thehy

25、drogenionhasamuchgreatermobilitythanthehydroxylionotherionssothatatlowpH’stheconductivitywillberelativelyhigherthanathighpH’sfthesameionicconcentration.Howeverthebiasintroducedbythisfactisintheproperdirection.Thatishighc

26、onductivityduetoalowerpHofthecontaminationwouldnmallyindicategreatercrosionpotential.12.2.2Abiasmaybeintroducedbyextraneouscontaminationfromreducedsensitivityofinstrumentsflowlevelsofcontaminationintherangeofconductivity

27、between030mhocm.13.Keywds13.1abrasiveanalysisblastingchlideconductimetricconductivitycontaminationinterlabatytestingionogenicprecisionsaltssteelsurfacesASTMInternationaltakesnopositionrespectingthevalidityofanypatentrigh

28、tsassertedinconnectionwithanyitemmentionedinthisstard.Usersofthisstardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrightstheriskofinfringementofsuchrightsareentirelytheirownresponsibility.Thisstardissu

29、bjecttorevisionatanytimebytheresponsibletechnicalcommitteemustbereviewedeveryfiveyearsifnotrevisedeitherreapprovedwithdrawn.YourcommentsareinvitedeitherfrevisionofthisstardfadditionalstardsshouldbeaddressedtoASTMInternat

30、ionalHeadquarters.Yourcommentswillreceivecarefulconsiderationatameetingoftheresponsibletechnicalcommitteewhichyoumayattend.IfyoufeelthatyourcommentshavenotreceivedafairhearingyoushouldmakeyourviewsknowntotheASTMCommittee

31、onStardsattheaddressshownbelow.ThisstardiscopyrightedbyASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959UnitedStates.Individualreprints(singlemultiplecopies)ofthisstardmaybeobtainedbycontactingASTMatt

32、heaboveaddressat6108329585(phone)6108329555(fax)(email)throughtheASTMwebsite(www.astm.g).PermissionrightstophotocopythestardmayalsobesecuredfromtheASTMwebsite(www.astm.gCOPYRIGHT).6SupptingdatahavebeenfiledatASTMInternat

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