Designation:G91−11StandardPracticeforMonitoringAtmosphericSO2DepositionRateforAtmosphericCorrosivityEvaluation1ThisstandardisissuedunderthefixeddesignationG91;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstwomethodsofmonitoringatmo-sphericsulfurdioxide,SO2depositionrateswithspecificapplicationforestimatingorevaluatingatmosphericcorrosiv-ityasitappliestometalscommonlyusedinbuildings,structures,vehiclesanddevicesusedinoutdoorlocations.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D516TestMethodforSulfateIoninWaterD1193SpecificationforReagentWaterD2010/D2010MTestMethodsforEvaluationofTotalSul-fationActivityintheAtmospherebytheLeadDioxideTechniqueG16GuideforApplyingStatisticstoAnalysisofCorrosionDataG84PracticeforMeasurementofTime-of-WetnessonSur-facesExposedtoWettingConditionsasinAtmosphericCorrosionTestingG140TestMethodforDeterminingAtmosphericChlorideDepositionRatebyWetCandleMethodG193TerminologyandAcronymsRelatingtoCorrosion2.2ISOStandards:3ISO9225Corrosionofmetalsandalloys-Corrosivityofatmospheres–Measurementofenvironmentalparametersaffectingcorrosivityofatmospheres3.Terminology3.1Definitions—TheterminologyusedhereinshallbeinaccordancewithTerminologyandAcronymsG193.4.SummaryofPractice4.1Sulfationplatesconsistingofaleadperoxidereagentinaninverteddishareexposedfor30-dayintervals.Theplatesarerecoveredandsulfateanalysesperformedonthecontentstodeterminetheextentofsulfurcapture.Leadperoxidecylinder...
