ASTM-G8-96（R2003）-Standard-Test-Methods-for-Cathodic-Disbonding-of-Pipeline-Coatings1

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1、Designation:G8–96(Reapproved2003)StandardTestMethodsfor1CathodicDisbondingofPipelineCoatingsThisstandardisissuedunderthe®xeddesignationG8;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumber

2、inparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.ScopeG80TestMethodforSpeci®cCathodicDisbondingof1.1ThesetestmethodscoveracceleratedproceduresforPipelineCoatingssimultaneouslydeterminingc

3、omparativecharacteristicsofin-G95TestMethodforCathodicDisbondmentTestofPipe-sulatingcoatingsystemsappliedtosteelpipeexteriorforthelineCoatings(AttachedCellMethod)purposeofpreventingormitigatingcorrosionthatmayoccurin3.SummaryofTestMethodsundergroundservicewherethepip

4、ewillbeincontactwithinlandsoilsandmayormaynotreceivecathodicprotection.3.1BothofthetwotestmethodsdescribedsubjecttheTheyareintendedforusewithsamplesofcoatedpipetakencoatingonthetestspecimentoelectricalstressinahighlyfromcommercialproductionandareapplicabletosuchcondu

5、ctive,alkalineelectrolyte.Electricalstressisobtainedsampleswhenthecoatingischaracterizedbyfunctionasaneitherbymeansofasacri®cialmagnesiumanodeorfromanelectricalbarrier.impressedcurrentsystem.Thecoatingisperforatedbefore1.2Thistestmethodisintendedfortestingcoatingssub

6、-startingthetest.mergedorimmersedinthetestsolutionatroomtemperature.3.1.1InMethodA,amagnesiumanodeisusedwithnoWhenitisimpracticaltosubmergeorimmersethetestelectricalmonitoringduringthetestperiod.Theresultsarespecimen,TestMethodG95maybeconsideredwherethetestdetermined

7、byphysicalexaminationafterthetestperiodiscelliscementedtothesurfaceofthecoatedpipespecimen.Ifconcluded.highertemperaturesarerequired,seeTestMethodG42.Ifa3.1.2InMethodB,eitheramagnesiumanodeoranim-speci®ctestmethodisrequiredwithnooptions,seeTestpressedcurrentsystemmay

8、beused.ElectricalinstrumentationMethodG80.isprovidedformeasuringthecurrentinthecellcircuit.The1.3ThevaluesstatedinSIunitsto3signi®c