Designation:E118–89(Reapproved1996)StandardTestMethodsforChemicalAnalysisofCopper-ChromiumAlloys1ThisstandardisissuedunderthefixeddesignationE118;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverproceduresforthechemicalanalysisofchromium-copperalloyshavingchemicalcompo-sitionswithinthefollowinglimits:Copper,%98andoverChromium,%0.6to1.2Silicon,%0to0.10Iron,%0to0.101.2Theanalyticalproceduresappearinthefollowingorder:SectionsCopperbytheElectrolyticMethod8-11ChromiumbytheDichromate(Potentiometric)Method12-15SiliconbythePerchloricAcidDehydrationMethod162.ReferencedDocuments2.1ASTMStandards:E29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformanceWithSpecifications2E50PracticesforApparatus,Reagents,andSafetyPrecau-tionsforChemicalAnalysisofMetals3E54TestMethodsforChemicalAnalysisofSpecialBrassesandBronzes3E55PracticeforSamplingWroughtNonferrousMetalsandAlloysforDeterminationofChemicalComposition3E60PracticeforPhotometricandSpectrophotometricMethodsforChemicalAnalysisofMetals3E62TestMethodsforChemicalAnalysisofCopperandCopperAlloys(PhotometricMethods)33.SignificanceandUse3.1Thesetestmethodsforthechemicalanalysisofmetalsandalloysareprimarilyintendedtotestsuchmaterialsforcompliancewithcompositionalspecifications.Itisassumedthatallwhousethesetestmethodswillbetrainedanalystscapableofperformingcommonlaboratoryproceduresskill-fullyandsafely.Itisexpectedthatworkwillbeperformedinaproperlyequippedlaboratory.4.Apparatus,Reagents,andPhotometricPractice4.1Apparatusandreagentsrequiredforeachdeterminationarelistedinseparatesectionsprecedingtheprocedure.Theapparatus,standardsolutions,andcertainotherreagentsusedinmorethanoneprocedurearereferredtobynumberandshallconformtotherequirementsprescribedinPracticesE50,exceptthatphotometersshallconfo...
