Designation:A1071/A1071M−11(Reapproved2015)StandardTestMethodforEvaluatingHygrothermalCorrosionResistanceofPermanentMagnetAlloys1ThisstandardisissuedunderthefixeddesignationA1071/A1071M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheequipment,procedures,andmeasurementoftheresistanceofpermanentmagnetalloysagainstcorrosioninhightemperature,highpressurewatervaporenvironments.ThistestisalsoknownastheBulkCorrosionTest(BCT).1.2Thevaluesandequationsstatedincustomary(cgs-emuandinch-pound)unitsorSIunitsaretoberegardedseparatelyasstandard.WithinthisstandardtheSIunits,whendifferentfromcustomaryunits,areshowninbrackets,thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D3330/D3330MTestMethodforPeelAdhesionofPressure-SensitiveTape2.2JEDECStandards:3JESD22-A102-CAcceleratedMoistureResistance–Unbi-asedAutoclave3.Terminology3.1Definitions:3.1.1bulkcorrosiontest(BCT)grade,n—gradegiventorangesofspecificweightlosstoindicatetherelativecorrosionresistanceofamaterial.(Thegradesarelistedin15.2.)3.1.2specificweightloss,n—weightlossofthespecimenperunitofexposedsurfacearea,inunitsofmilligramspersquarecentimetre,duetocorrosionanddisintegration.4.SummaryofTestMethod4.1Permanentmagnetsamplesareexposedtopressurizedsteamtodeterminetheresistanceofthesematerials,especiallyrareearth-typepermanentmagnets,todegradationbythecombinedactionofheatandwaterva...
