Designation:D5723−95(Reapproved2019)StandardPracticeforDeterminationofChromiumTreatmentWeightonMetalSubstratesbyX-RayFluorescence1ThisstandardisissuedunderthefixeddesignationD5723;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThispracticecoverstheuseofX-rayfluorescence(XRF)techniquesfordeterminationofthecoatingweightofchromiumtreatmentsonmetalsubstrates.Thesetechniquesareapplicablefordeterminationofthecoatingweightaschro-miumortotalcoatingweightofachromium-containingtreatment,orboth,onavarietyofmetalsubstrates.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.SummaryofPractice2.1Excitation—ThemeasurementofchromiumtreatmentcoatingweightsbyXRFmethodsisbasedonthecombinedinteractionofthechromiumcoatingandsubstratewithanintensebeamofprimaryradiation.Sinceeachelementfluo-rescesatanenergycharacteristicoftheparticularelement,thisinteractionresultsinthegenerationofXraysofdefinedenergy.TheprimaryradiationmaybegeneratedbyanX-raytubeorderivefromaradioisotope.2.2Detection—Thesecondarybeam(fluorescentXraysoftheelementsandscatteredradiation)isreadbyadetectorthatcandiscriminatebetweentheenergylevelsoffluorescingradiationsinthesecondarybeam.Thedetectionsystemin-cludestheradiationdetectorwithelectronicsforpulseampli-ficationandpulsecounting.2.3BasicPrinciple:2.3.1Arelationship...
