【英文标准名称】:StandardPracticeforConductingWire-on-BoltTestforAtmosphericGalvanicCorrosion
【原文标准名称】:大气电流腐蚀用绕线螺栓试验
【标准号】:ASTMG116-1999(2004)
【标准状态】:现行
【国别】:
【发布日期】:1999
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:G01.04
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:腐蚀;试验
【英文主题词】:aluminum;architecturalmaterials;ATCORRtest;atmosphericcorrosion;atmosphericcorrosivity;bolts;CLIMATtest;copper;corrosion;corrosiontest;corrosivity;galvaniccorrosion;rod;wire;wire-on-bolttest
【摘要】:Thesmallsizeofthewirecomparedtotheshortgalvanicinteractiondistanceinatmosphericexposuresgivesalargecathode-to-anodearearatiowhichacceleratesthegalvanicattack.Theareabetweenthewireandthethreadscreatesalong,tightcrevice,alsoacceleratingthecorrosion.Forthesereasons,thispractice,withatypicalexposureperiodof90days,isthemostrapidatmosphericgalvaniccorrosiontest,particularlycomparedtoTestMethodG104.Theshortdurationofthistestmeansthatseasonalatmosphericvariabilitycanbeevaluated.(Ifaverageperformanceovera1-yearperiodisdesired,severalstaggeredexposuresarerequiredwiththistechnique.)Reproducibilityofthispracticeissomewhatbetterthanotheratmosphericgalvaniccorrosiontests.Themajordisadvantageofthistestisthattheanodematerialmustbeavailableinwireformandthecathodicmaterialmustbeavailableintheformofathreadedrod.ThisshouldbecomparedtoTestMethodG104whereplateorsheetmaterialisusedexclusively.Anadditionallimitationisthatthemoreanodicmaterialofthepairmustbeknownbeforehand(frominformationsuchasinGuideG82)orassembliesmustbemadewiththematerialcombinationsreversed.Themorphologyofthecorrosionattackoritseffectonmechanicalpropertiesofthebasematerialscannotbeassessedbythispractice.TestMethodG104ispreferableforthispurpose.ThistesthasbeenusedunderthenamesCLIMATandATCORRtodetermineatmosphericcorrosivitybyexposingidenticalspecimensmadefrom1100aluminum(UNSA91100)wirewrappedaroundthreadedrodsofnylon,1010mildsteel(UNSG10100orG10080),andCA110copper(UNSC11000).Atmosphericcorrosivityisafunctionofthematerialthatiscorroding,however.Therelativecorrosivityofatmospherescouldbequitedifferentifadifferentcombinationofmaterialsischosen.1.1Thispracticecoverstheevaluationofatmosphericgalvaniccorrosionofanyanodicmaterialthatcanbemadeintoawirewhenincontactwithacathodicmaterialthatcanbemadeintoathreadedrod.1.2Whencertainmaterialsareusedfortheanodeandcathode,thispracticehasbeenusedtoratethecorrosivityofatmospheres.1.3Thewire-on-bolttestwasfirstdescribedin1955(1),andhassincebeenusedextensivelywithstandardmaterialstodeterminecorrosivityofatmospheresunderthenamesCLIMATTest(CLassifyIndustrialandMarineATmospheres)(2-5)andATCORR(ATmosphericCORRosivity)(6-9).1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:H25
【国际标准分类号】:25_220_40;77_060
【页数】:4P.;A4
【正文语种】: