BS EN 12501-2-2003 Protection of metallic materials against corrosion - Corrosion likelihood in soil - Low alloyed and non alloyed ferrous materials《金属材料的防腐蚀 土壤中腐蚀可能性 低合金和非合金黑色金属材料.pdf

1、BRITISH STANDARD BS EN 12501-2:2003 Protection of metallic materials against corrosion Corrosion likelihood in soil Part 2: Low alloyed and non alloyed ferrous materials The European Standard EN 12501-2:2003 has the status of a British Standard ICS 77.060 BS EN 12501-2:2003 This British Standard was

2、 published under the authority of the Standards Policy and Strategy Committee on 6 May 2003 BSI 6 May 2003 ISBN 0 580 41779 4 National foreword This British Standard is the official English language version of EN 12501-2:2003. The UK participation in its preparation was entrusted to Technical Commit

3、tee ISE/NFE/8, Corrosion of metals and alloys, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this documen

4、t may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Us

5、ers are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for chang

6、e, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright date

7、 displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN125012 April2003 ICS77.060 Englishversion ProtectionofmetallicmaterialsagainstcorrosionCorrosion likelihoodinsoilPart2:L

8、owalloyedandnonalloyedferrous materials Protectiondesmatriauxmtalliquescontrelacorrosion RisquedecorrosiondanslessolsPartie2:Matriaux ferreuxpeuounonallis KorrosionsschutzmetallischerWerkstoffe KorrosionswahrscheinlichkeitinBdenTeil2:Niedrigund unlegierteEisenwerkstoffe ThisEuropeanStandardwasapprov

9、edbyCENon21February2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtothe

10、ManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationa

11、lstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRN

12、ORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN125012:2003EEN125012:2003(E) 2 Contents page Foreword3 Introduction .4 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .4 4 Assessment

13、ofthecorrosionloadinsoilforanewstructuretobeburied 4 4.1 Method 4 4.2 Criteria.5 4.2.1 Soilconditions . 5 4.2.2 PreliminaryInquiry . .5 4.2.3 Sitesurvey. .5 4.2.4 Soilsampling. .6 4.2.5 Backfillmaterials .7 5 Complementaryinformationforanexistingstructure. 7 5.1 General7 5.2 Investigationsandanalysi

14、s . .8 AnnexA (informative) Procedureforassessingthecorrosionloadinsoilinthecaseofanew structure9 AnnexB (informative) Generalprinciplesofsoilstudies10EN125012:2003(E) 3 Foreword Thisdocument(EN125012:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC262“Metallicandother inorganiccoatings”,thesecretaria

15、tofwhichisheldbyBSI. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyOctober2003,andconflictingnationalstandardsshallbewithdrawnatthelatest byOctober2003. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardso

16、rganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN125012:2003(E) 4 Introdu

17、ction ThisEuropeanStandardshouldbeusedinconjunctionwithEN125011, Protectionofmetallicmaterialsagainst corrosionCorrosionlikelihoodinsoil Part1: General, whichdescribesgeneralprinciplesoftheassessmentof thecorrosionload. Themethodofassessingthecorrosionloadinthecaseofanewstructuretobeinstalledtakesin

18、toaccountthe adverseparametersofthesoilandenvironmentwithregardtocorrosion.Theyhavebeenchosentoavoid underestimationoftherisksofcorrosiondamage.Theassessmentisperformedconsideringabarestructurein directcontactwiththesoilwithouttakingintoaccountanyprotectivesystemthatwillbepresentinservice. Thecomple

19、xityofcorrosioninsoildemandsthatthemeasurementsandtheirinterpretationarecarriedoutby experiencedpersonnel.Thedescribedmethodshouldbeadaptedinrelationtotheexpectedservicelifeofthe structureandtopossiblefuturechangesofitsenvironment. 1Scope ThispartofthisEuropeanStandarddealswiththeassessmentofthecorr

20、osionloadinsoilforlowalloyedandnon alloyedferrousmaterialsindirectcontactwithsoil.Corrosionprotectionsystemsandtheirperformancearenot coveredbythisstandardbutbyspecificproductsstandards. ThispartofthisEuropeanStandarddealswiththecaseofnewstructurestobeburiedandgivesinformationfor existingstructures.

21、 2 Normativereferences ThisEuropeanStandardincorporatesbydatedorundatedreference,provisionsfromotherpublications.These normativereferencesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytot

22、hisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferencesthelatesteditionofthe publicationreferredtoapplies(includingamendments). EN125011:2003,ProtectionofmetallicmaterialsagainstcorrosionCorrosionlikelihoodinsoilPart1: General. 3 Termsanddefinitions Forthepurposesofthi

23、sEuropeanStandard,thetermsanddefinitionsgiveninEN125011:2003apply. 4 Assessmentofthecorrosionloadinsoilforanewstructuretobeburied 4.1Method Themethodtobeappliedisbasedon: generalconceptsandfactorsinfluencingthecorrosionloadgiveninEN125011; criteriadefinedinthepresentstandard.EN125012:2003(E) 5 Theco

24、rrosionloadisacceptedhighifnoinvestigationisdoneforanyreason. 4.2Criteria 4.2.1Soil conditions Table1summarisesdifferentsoilconditionstobeexaminedduringeitherthepreliminaryinquiryorthesitesurvey andwhichindicatealocationofhighcorrosionload,intheabsenceoffurtherinvestigation. Table1soilconditionsthat

25、canleadtoahighcorrosionload Characteristics Circumstances Examplesofcriteria Typeofsoil Naturalsoil Presenceofpeat,lignite,coalinthesoils Areassuchasmarsh,fen, Tidalzone Presenceofbrackishorseawatertable Anaerobicsoils(PossibleMicrobiallyInducedCorrosion) Artificialsoil Soilscontainingashes,slag,ind

26、ustrialbyproducts,residues ofhouseholdrefuse,. Areasbackfilledbyindustrialbyproducts(anytype) Uncontrolledrecycledmaterials Electricalinfluence DeviceusingDC ClosevicinityofDCrailways,tramways,underground,. Proximityofacathodicallyprotectedstructure,oranodes,. DeviceusingAC ProximityofACpowerlines,A

27、Crailways ProximitytoACearthingelectrodes Pollution Contaminatedsoils Contaminationbydeicingsalts,manure,fertilisers,leaking sewer,industrialpollution TopographyHydrography Presenceonthepiperouteofalowpoint,acreekorriver crossing,. Others Toponomy Indicationsfromthevillagenamesofspecialcharactersoft

28、he natureofsoil Threephaseboundary Fluctuatingwatertable 4.2.2Preliminary Inquiry Apreliminaryinquirygenerallyconsistsofatopographicalstudy,ageologicalstudyandaninvestigationforspecific information.Itenablestoidentifyareaswhichshouldbestudiedwithparticularattentionduringthesitesurvey. AnnexBgivesmor

29、edetailedinformationonthewaytocollectdataduringthepreliminaryinquiry. Intheabsenceoffurtherinvestigation,suchassitesurveyorsoilsampling,andifoneormorecriteriaasgivenin table1aremetcorrosionloadisacceptedhigh. 4.2.3 Sitesurvey Asitesurveyconsistsincollectingadditionalinformation(seeTable1)byobservati

30、onsandmeasurementsonthe constructionsite;soilresistivitymeasurementshavetobeperformedand,whenappropriate,potentialgradient measurements. AnnexBgivesadditionalinformationonthewaytocarryoutasitesurvey. Thefollowingcriteriaallowtoassessthecorrosionload,basedonvisualinspectionofsoilandresistivity measur

31、ementsfromthesurfaceduringthesitesurvey:EN125012:2003(E) 6 resistivityvaluesbelow30 W mand/orsoilconditionsasgiveninTable1indicatelocationsofhighcorrosion load; ifresistivityvaluesareabove30 W m,additionalinvestigationsuchassoilsamplingshallbedone.However,if thethreefollowingconditionsarefulfilledto

32、gether,theyindicatelocationsoflowcorrrosionloadandnoother investigationisnecessary: soilissandorgravel, resistivityvaluesareabove100 W m,forsitesurveyconditionsrepresentativeoftheaveragesoil moisturecontentandtemperaturevalues, soilconditionsasgiveninTable1areabsent. Inaddition,incaseofapossibleelec

33、tricalinfluence,whateveritsorigin,measurementsshouldbetakenonsitein ordertoassessmorepreciselyitseffectsontheestimationofthecorrosionload.Ifnomeasurementisperformed thecorrosionloadisacceptedhigh. 4.2.4 Soilsampling Soilsamplesaretakenatvariouslocationsonsitetakingintoaccountthenature,theheterogenei

34、tyandthe wetnessofthesoil;theresistivityandpHvaluesofthesoilsamplesarethenmeasuredinthelaboratory. AnnexBgivesadditionalinformationontheprocedureandmeasurementmethodsusedforsoilsampling. Theminimumresistivityvalue r *andthepHvaluemeasuredonasoilsampleafteradditionofdeionizedwater allowtoassessthecor

35、rosionloadusingTable2;theevaluationofsoilsontheborderbetweentwofieldsof corrosionloadrequiresexpertknowledge. Inaddition,amediumcorrosionloadshouldbechangedtohighwhenheterogeneoussoilconditionsoccuratthe levelofthestructure,suchas: presenceofawatertable(partlysubmergedstructure); widerangeof r *valu

36、esofsamples( r *max/ r *min3); widerangeofpHvaluesofsamples(pHmaxpHmin1,5). Table2Corrosionload(freecorrosionwithoutconcentrationcell) 9,5 69,5 HIGH MEDIUM LOW pH 4,56 4,5 10 30 50 100 r *=Minimumresistivityvalueafteraddingdeionizedwater( W m)EN125012:2003(E) 7 4.2.5Backfill materials Thecorrosionof

37、aburiedstructurewilldependuponthecorrosionloadofthenativesoil,butalsouponthe backfillingprocedure,thebackfillmaterials(especiallyiftheyaredifferentfromthenativesoil)andthepossible leachingconditions.Anassessmentofthecorrosionloadofimportedbackfillmaterialsshouldthereforebecarried outasitmayeitherinc

38、reaseorreducetheeffectivecorrosionloadonthestructure. Table3indicatescriteriatobemetbythebackfillmaterialsinordertoleadtoalowcorrosionload. Table3Criteriaforbackfillmaterials Parameters Lowcorrosionload Resistivity r *100 W m pH a 6pH9 Sulfide 10mg/kg Carbon Novisualdetectionofcoal,coke,graphite,car

39、boniferousresidues a MaterialsoutsidethispHrange,butwithlowacidityoralkalinityamount,couldbeconsideredas leadingtoalowcorrosionload. Whenindustrialbyproductsareconsideredasbackfillmaterials,thepresenceandamountofmetallicsaltsshould alsobeconsideredinordertoavoidpossiblegalvaniccorrosion. Theuseofsel

40、ectedbackfillmaterialsasshowninTable3canreducethecorrosionload(fromhightomediumor frommediumtolow),butonlywhenthefollowingconditionsarefulfilled: nowatertableorleachingconditionsthatcouldcausecontaminationfromthesurroundingnativesoil; nomixedsoils(nativeandimported)incontactwiththestructure. 5 Compl

41、ementaryinformationforanexistingstructure 5.1General Inthecaseofanexistingstructure,thecorrosionloadinsoilisassessedeithertoperformadiagnosisinorderto evaluatetheremaininglifetimeofthestructureortoestablishthereasonsofcorrosiondamagesand/orfailureson thestructure. Asthestructureactuallylaysinthesoil

42、,moreinformationcanbecollectedthaninthecaseofanewstructure (seeEN125011:2003;annexB).Thiscovers: theinformationonthestructureitself(suchascorrosioneffects,operatingconditions); thecharacteristicsofthesoildirectlyincontactwiththewallsofthestructure; theeffectoftheenvironment(mainlyelectricalinfluence

43、s); thesystemofprotection(typeofcoating,cathodicprotection,.). Thethreestepsoftheprocedureforanewstructurecanbeusedfortheassessmentofthecorrosionload;butthe investigationconductedduringpreliminaryinquiry,sitesurveyandsoilsamplingwillbemorecompletethanforaEN125012:2003(E) 8 newstructure.Moreover,itisalsopossibletotakeintoaccountsamplescomingfromthestructureitselftoperform theassessment. Dependingontheeconomicalimpact,theassessmentofthecorrosi