ASTM G 4-95 Standard Guide for Conducting Corrosion Coupon Tests in Field Applications.pdf

《ASTM G 4-95 Standard Guide for Conducting Corrosion Coupon Tests in Field Applications.pdf》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、Designation:G4–95StandardGuidefor1ConductingCorrosionCouponTestsinFieldApplicationsThisstandardisissuedunderthe®xeddesignationG4;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthese

2、sindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.ScopeG41PracticeforDeterminingCrackingSusceptibilityofMetalsExposedUnderStresstoaHotSaltEnvironment41.1Thisguidecoversproceduresforconductingcorrosioncou

3、pontestsinplantequipmentunderoperatingconditionstoG44PracticeforEvaluatingStressCorrosionCrackingevaluatethecorrosiveattackuponengineeringmaterials.ItResistanceofMetalsandAlloysbyAlternateImmersionin3.5%SodiumChlorideSolution4doesnotcoverelectrochemicalmethodsfordetermi

4、ningcor-rosionrates.G46PracticeforExaminationandEvaluationofPittingCorrosion41.1.1Whileintendedprimarilyforimmersiontests,generalguidelinesprovidedcanbeapplicableforexposureoftestG47TestMethodforDeterminingSusceptibilitytoStress-couponsinplantatmospheres,providedthatpla

5、cementandCorrosionCrackingofHighStrengthAluminumAlloyProducts4orientationofthecouponsisnon-restrictivetoaircirculation.1.2ThevaluesstatedinSIunitsaretoberegardedastheG58PracticeforPreparationofStress-CorrosionTestSpecimensforWeldments4standard.Thevaluesgiveninparenthese

6、sareforinformationonly.G78GuideforCreviceCorrosionTestingofIron-Baseand1.3ThisstandarddoesnotpurporttoaddressalloftheNickel-BaseStainlessAlloysinSeawaterandOtherChloride-ContainingAqueousEnvironments4safetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheus

7、erofthisstandardtoestablishappro-3.Signi®canceandUsepriatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Seealso10.4.2.3.1Observationsanddataderivedfromcoupontestingareusedtodeterminetheaveragerateofcorrosionandthetypeof2.Referenc

8、edDocumentsattack(seeTerminologyG15)thatoccurduringtheexposure2.1ASTMStandards:interval.Thedatamaybeusedaspart