铝合金在NaHSO_3溶液中干湿周浸腐蚀行为_周和荣(1)

Table1Chemicalcompositionsofsamplesmaterials10602A12-T47A04－T6Si0.0610.130.068Fe0.360.350.42Cu0.024.681.51Mn0.020.530.24Mg0.021.582.62Zn0.0050.105.99Ti-0.0230.015AlBal.Bal.Bal.286200812JournalofChineseSocietyforCorrosionandProtectionVol.28No.6Dec.2008NaHSO3131213331.1000832.、1000833.510063、1060、2A127A040.02mol/LNaHSO3SEMEDXXPS。A12O3A1,360h10602A127A04。TG172A1005-4537200806-0345-061、、、、。。SO21。、SO2。SO2。2～9。、、。2LC4。Gamal5。0.02mol/LNaHSO3SO2。21060、2A127A041。。30mm×20mm×2.8mm150024h0.1mg。GB/T16865-1997《、》。10mm×10mm2000。GB/T19746-2005《》0.02mol/LNaHSO320mL/cm2。25℃±2℃40℃±2℃。60min10min50min720h。24h、48h、96h、144h、240h、360h、[e-mail]34628Fig.1Micrographsofaluminiumalloysa1060b2A12c7A04Fig.2SEMmorphologiesofaluminiumalloyscorrodedin0.02mol/LNaHSO3solutiona1060240hb1060720hc2A12240hd2A12720he7A04240hf7A04720h720h240h、480h720h。PARSTAT227310mHz～100kHz10mV。EDXXPS。33.1。11060、2A127A04。10601aFeAl32A127A041b1c2A12T4θAl2CuSAl2CuMg7A04T6MgZn、Al7Cu2Fe、AlCu6FeCuMg2Si10。、、、。3.221060、2A127A040.02mol/LNaHSO32d2f。31060240h720h2bA。2A127A04240h2c2e720h2d2fB。11。3.31060、2A127A040.02mol/LNaHSO3Al、S、O。XPS7A04Al、S、O3A12O3A112。3.441060、2A127A040.02mol/LNaHSO3。720h10607A04。3.551060、2A127A040.02mol/LNaHSO3。720h10606347NaHSO3Fig.5aStrengthandbelongationpercentageofalu－minumalloys1060,2A12and7A04corrodedin0.02mol/LNaHSO3solution




















































 


Fig.4Masslossofaluminiumalloys10602A12and7A04corrodedin0.02mol/LNaHSO3solution

























massloss/mg·cm-2Fig.3XPSspectrumsofaluminiumalloy7A04corrodedfor720hasurveybAl2pcO1sdS2p


       

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    14.8%13.4%2A1213.8%46.1%7A049.97%68.2%。3.661060、2A127A040.02mol/LNaHSO3Nyquist。10606a720h2a7a13RsCPE1R1LCPE2Rct。2A127A046b6c。7b。81/Rct720h360h。10607A044。3.734828γ-Al2O32nm～3nmγ-Al2O3γ-AlOOHAl(OH)3。Al-3e→Al3+(1)O2+4H++4e→2H2O(2)1060、2A127A040.02mol/LNaHSO3Al2O312HSO3-+O→HSO4-(3)HSO4-→H++SO42-(4)x(Al3+)+y(SO42-)+z(OH-)→Alx(SO4)y(OH)z(5)x(Al3+)+y(HSO4-)+z(OH-)→Alx(SO4)y(OH)z(6)。0.02mol/LNaHSO32a2b456a。2A127A046b6c48。1060、2A127A040.02mol/LNaHSO3。14～16AlηSθ、AlCu6FeCu、Al7Cu2FeAl。AlAl。Al。10602A127A04。0.02mol/LNaHSO37A04。411060、2A127A040.02mol/LNaHSO3Al2O3Al。21060、2A127A04720h360h。31060、2A127A040.02mol/LNaHSO310602A127A04。1ZhangXY,AnBG,HanEH,etal.RunoffandcorrosionofmaterialduetoacidrainJ.Corros.Sci.Prot.Technol.,2002,143:157-160,,./J.,2002,143:157-1602WangZY,MaT,HanW,etal.CorrosionbehaviorofaluminiumalloysLC4insimulatedpollutedatmosphericenvironmentJ.J.Chin.Soc.Corros.Prot.,2005,256321-326.LC4J.2005256321-3263GonzalezJA,MorcilloM,LopezV,etal.Atmosphericcorrosionofbareandanodizedaluminiuminawiderangeofenvironmentalconditions,PartI:VisualobservationsandgravimetricresultsJ.Surf.Coat.Technol.,2002,153:225-2344MendozaAR,CorvoF.OutdoorandindooratmosphericcorrosionofnonferrousmetalsJ.Corros.Sci.,2000,42:1123-11475GamalAEL-MahdyKwangBKim.ACimpedancestudyontheatmosphericcorrosionofaluminiumunderperiodicwet-dryconditionsJ.Electrochim.Acta,2004,49:1937-19486ChengYL,ZhangZ,CaoFHetal.Astudyofthecorrosionofaluminiumalloy2024-T3underthinelectrolytelayersJ.Corros.Sci.,2004,467:1649-16677OeschS,FallerM.Environmentaleffectsonmaterials:theeffectoftheairpollutantsSO2,NO2,NOandO3onthecorrosionofcopper,zincandaluminium,Ashortliteraturesurveyandresultsoflaboratory6349NaHSO3Abstract:Thecorrosionbehaviorsofaluminiumalloys1060，2A12and7A04undercyclicwet-dryimmersionconditionshavebeeninvestigatedin0.02mol/Lsodiumsulfitesolutionbythemasslossmethodandelectrochem-icalimpedancespectroscopy（EIS）.Scanningelectronmicroscopy（SEM）wasusedtoobservethesurfacemor-phology；energydispersiveX-raydetector（EDX）andX-rayphotoelectronspectroscopy（XPS）wereemployedtoanalyzethecorrosionproducts.Wealsotestedthemechanicalcapabilityofexperimentalmaterials.Theresultsshowedthatcorrosionproductwasincreasingwithtestinghoursprolonging,masslossadding,strengthandelon-gationpercentagedeclining.Surfaceobservationrevealedthatcorrosionproductwasagglomeratedandaccident-ed,extendingforth.Themaincorrosionproductisaluminaandaluminiumsulfatehydrate.TheresultsofEISin-dicatedthatcorrosionrateishighestin360hour.Corrosionresistanceofaluminium1060wasbestin0.02mol/Lsodiumsulfitesolution,butthatofaluminiumalloy7A04wasworst.Keywords:aluminiumalloys，cyclicwet－dryimmersiontest，masslossmethod，EISZHOUHerong1,3，LIXiaogang1，2，DONGChaofang1，MAJian3，LUQikai3，FENGHao3（1.CorrosionandProtectionCenter，UniversityofScienceandTechnologyBeijing，Beijing100083；2.BeijingKeyLaboratoryforCorrosion，ErosionandSurfaceTechnology，UniversityofScienceandTechnologyBeijing，Beijing100083；3.StateKeyLaboratoryofEnvironmentalAdaptionforIndustri