浙江海洋大学外文翻译Word文档格式.docx
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浙江海洋大学外文翻译Word文档格式.docx
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A13安工
学号:
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二○年月
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外文翻译:
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AdvancedMaterialsResearchVol.710(2013)pp41-44Onlineavailablesince2013/Jun/27at©
(2013)TransTechPublications,Switzerlanddoi:
10.4028/
CorrosionInhibitionofChloroacetic-AcidModifiedImidazolineforQ235SteelinH2SO4Solution
ZhaoBin1,2,3,aZouLike2,3,b
(1.CollegeofMaterialsandChemicalEngineering,SichuanUniversityofScience&
Engineering,China;
2.MaterialCorrosionandProtectionKeyLaboratoryofSichuanProvince,China;
3.InstituteofFunctionalMaterials,SichuanUniversityofScience&
Engineering,China)
a***************.cn,b*****************.cn
Keywords:
quaternizedimidazoline;
corrosioninhibitors;
weightlossmeasurement;
polarizationcurve
Abstract.Anewchloroacetic-acidmodifiedimidazoline(CAMI)wassynthesizedviathequaternizationofimidazolineintermediate,obtainedfromtheamidationandcyclizationreactionsofbenzoicacidanddiethylenetriamine,withchloroacetic-acid.TheperformanceofthesynthesizedcompoundCAMIascorrosioninhibitorforQ235carbonsteelin5%sulfuricacidsolutionwasinvestigatedbyweightlossmeasurementandpotentiodynamicpolarizationtechnique.TheresultsshowthatCAMIpossessesstronginhibitiveeffectonthecorrosionofQ235carbonsteelinacidmediumandrestrainsthecorrosionwithoutchangingthecathodicandanodiccorrosionmechanismasamixed-typeinhibitor.
Introduction
Everyyear,heavylossesarecausedbycorrosionofmetalsinnaturalenvironment,industrialproduction,oilandgasexplorationandproduction.Theapplicationofcorrosioninhibitorsisoneofthemosteffectiveandpracticalmethodsforprotectionmetalagainstcorrosioninvariouskindsofcorrosionmedium,especiallyinacidicmediaforthatacidsolutionsarewidelyusedinindustry,suchasacidpickling,industrialacidcleaning,aciddescalingandoil-wellcleaning.Themajorityofwell-knowninhibitorsareorganiccompoundscontainingnitrogen,sulfurand/oroxygenatoms[1-3].Amongthevariousorganicinhibitorsusedforinhibitingthecorrosionofmetalinacidmedium,nitrogen-basedorganicinhibitors,imidazolinederivativesattractmuchattentionduingtotheirexcellentinhibitionperformance[4].
However,mostoftheimidazolinederivativesareinsolubleinwaterandneedtobemodifiedtoimprovetheirwatersolubilityandcorrosioninhibitionperformance.Inthiswork,anewchloroacetic-acidmodifiedimidazoline(CAMI)wassynthesizedanditseffectivenessandelectrochemicalbehavioronthecorrosionofQ235steelwasstudiedbyweightlossmeasurement,potentiodynamicpolarizationtechnique.
Experimentalwork
Reagentsandapparatus.Allreagentswereavailablecommerciallyandusedasreceivedwithoutfurtherpurification.Q235steelwasusedinelectrochemicalandweightlossstudies.TestsolutionswerepreparedbyusingARgradesulfuricacidandtwicedeionizedwater.Aqueoussolutionof5%sulfuricacid(massratio)wasusedasthecorrosivemedium.
InfrareddatawasrecordedasKBrdiscsonaNiclet6700FT-IRspectrophotometer.ElectrochemicalmeasurementswerecarriedoutonElectrochemicalsynthesistestsystemLK98C(TianjinLanLiKeChemicalElectronicTechnologyCo.,China).
Preparationofimidazolineintermediate.Catalystaluminumoxideandwater-carryingagentxylenewereaddedtothemixtureofbenzoicacidanddiethylenetriamine(1:
1.2moleratio).Thereactionmixturewasstirredundernitrogenprotectionandheatedto140℃andkeptatthis
Allrightsreserved.NopartofcontentsofthispapermaybereproducedortransmittedinanyformorbyanymeanswithoutthewrittenpermissionofTTP,.(ID:
128.122.253.228,UniversityofNewSouthWales,Sydney,Australia-13/05/14,06:
05:
38)
temperaturefor3hours,thengraduallyheatedupto200℃andheldatthistemperatureuntiltherewasnowaterbeingcarriedoutbyxylene.Thelight-yellowsolidofimidazolineintermediatewasobtainedwhilethexylene,residualbenzoicacidanddiethylenetriaminewerecompletelyremovedbyvacuumdistillation.
O
COOH
C-NHCH2CH2NHCH2CH2NH2
+2NH2CH2CH2NHCH2CH2NH2
Amidation
140︒C,-2H2O
N
Cyclization
ClCH2COOH
+
200︒C,-2H2O
60︒C,Quaternization
Cl-
CH2CH2NH2
H2NH2CH2C
CH2COOH
Scheme1.PreparationofimidazolineintermediateandCAMI
Preparationofimidazolinecorrosioninhibitor(CAMI).Themixtureofobtainedimidazolineintermediatesandchloroaceticacid(1:
1.3moleratio)wasstirredat60℃for3hourstogivethequaternizedimidazolineinhibitor(CAMI).
Staticweightlosstest.TheweightlosstestswereperformedonthemetallicsamplesofQ235steelsheetwithdimensionsof2.0cmΧ1.5cmΧ0.2cm,whichwerewetabradedwithsiliconcarbidepaperfromnumber200to2000grit,washedwithdeionizedwateranddegreasedwithhexaneandrinsedinisopropanolandacetone.Foreachtest,threecleanedanddriedsampleswereimmersedin5%H2SO4(massratio)solutionwithsettingconcentrationofinhibitorCAMIatsettingtemperaturefor72h.Themetallicsampleswerethenremovedfromtheaqueoussolution,rinsedthoroughlywithdistilledwater,ethanolandacetone,driedandweightedaccuratelyagain.
Theinhibitionefficiency(η,weightlossmeasurements)wasdeterminedaccordingtoEq.1:
η(%)=W0−W1⋅100%(Eq.1)
W0
whereW0andW1aretheweightlossvaluesinabsenceandpresenceofCAMI,respectively.Electrochemicaltest.Electrochemicalstudies(potentiodynamicpolarization)werecarriedout
byusingaconventionalthree-electrodecellconsistingofaQ235steelworkingelectrode,asaturatedcalomelelectrode(SCE)asreferenceandaplatinumauxiliary-electrode.Thepotentiodynamicpolarizationcurveswereobtainedbychangingtheelectrodepotentialautomaticallyfrom-200mVto+200mVwithascanrateof0.5mV/stostudytheelectrochemicalbehaviorofCAMIonthecorrosionofQ235steel.Theinhibitionefficiency(η,electrochemicalmeasurements)wasdeterminedaccordingtoEq.2:
η(%)=I0−I1⋅100%(Eq.2)
I0
whereI0andI1arethecorrosioncurrentdensitiesinabsenceandpresenceofCAMI,respectively
Resultsanddiscussions
Infraredspectroscopy.Thecharacteristicstretchingfrequenciesforv(C=Ninimidazolinering)andv(N—HinNH2)arepeakedat1651cm-1and3277cm-1,respectively.ThemaximaN—Hbending(scissoring)vibrationabsorptioninprimaryaminegroupislocatedat1595cm-1.Thestretchingvibrationspeakswereseenat3058cm-1foraromaticC—H,at3931and2862forCH2,at1074and1025cm-1forC—N.Themonosubstitutedaromaticringontheimidazolineringisindicatedbytheabsorptionsat703and774cm-1.Theseinfraredabsorptionsillustratetheformationofimidazolineintermediate.
Gravimetricstudy.Fig.1andFig.2showthevariationofηin5%H2SO4calculatedfromweightlossofthemetallicsamples,subjectedtodifferentinhibitorconcentrationsatconstanttemperature(25°
C)anddifferentimmersiontemperatureswiththesameCAMIconcentration(30mg•L-1),respectively.
(%)
90
efficiency
85
80
inhibition
75
70
65
60
10
20
30
40
50
ConcentrationofCAMI(mg/L)
Fig.1TheinfluenceofCAMIconcentrationsoninhibitorefficiency
AsshowedinFig.1,whentheconcentrationofCAMIislessthan30mg•L-1,ηincreasesquicklywithanincreasinginCAMIconcentration,whileafurtherincreasecausesnoappreciablechangeininhibitionperformance,whichillustratesthattheCAMIinhibitormoleculesactbyadsorptionmechanismatQ235steel/acidinterface[5].Themaximumηis88%whentheCAMIconcentrationis60mg•L-1.
Toassesstheeffectoftemperatureoncorrosioninhibitiveprocess,weightlosstestswereperformedinthetemperaturerange25-45℃in5%H2SO4containing30mg•L-1CAMIinhibitor.Theresultshowsthatηdecreasedsharplywithincreasingtemperature(seeFig.2),whichisconsistentwiththefactsthatcorrosionrateinacidsolutionsincreasesexponentiallywithtemperatureincreasebecausethehydrogenevolutionoverpotentialdecreases[2]andthereactionrateofimidazolineringsplittingincreaseswithelevatedtemperatures[6].
Electrochemicalmeasurement.Theeffectofinhibitorconcentrationonbothanodicandcathodiccurvesofcarbonsteelin5%H2SO4wasstudiedusingpotentiodynamicpolarizationtechniqueatdifferentconcentrationsofCAMIinhibitor(0and300mg•L-1),theobtainedexperimentalresultsareshowninFig.3.AscanbeseeninFig.3,theslopesofthecathodicandanodicTafellinesarenotsignificantlyinfluencedbytheinhibitorconcentrationwhichsuggeststhattheCAMImoleculesrestrainsthecorrosionofQ235carbonsteelwithoutchangingthecathodicandanodiccorrosionmechanism[7].ThepresenceofinhibitorCAMI(300mg•L-1)bringsasignificanteffectonthecurrent–potentialrelationsforboththecathodicandanodicprocessandthedisplacementincorrosionpotential(30mV)ismuchlessthan85mV.AccordingtoFerreiraet.al[8]andLiet.al.[9],whenthedisplacementismorethan85
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