浙江海洋大学外文翻译.docx

浙江海洋大学外文翻译.docx

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浙江海洋大学外文翻译

浙江海洋大学

毕业论文（设计）外文翻译

学院：

石化与能源工程学院

专业：

安全工程

班级：

A13安工

学号：

*********

********

********

二○年月

<外文翻译：

原文>

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

N

Cyclization

N

ClCH2COOH

+

200︒C,-2H2O

60︒C,Quaternization

N

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

60

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