1、?孔?,、?,?已?已?代?!?,?五?,?二?,?!?,?,?,?,?一?,?一?口?,?一?,?盯?,?,?,?!#?%&#?&#()+,&?&)./,&?(0,(1(2#&)+&(1()&#)&(3,&(2)#&(#)24&#)5&+!?#)2(0#&%?#&(&(0!)+&%&(&,&?#&%&(#()&#)2,resPeetively.It15shownthatNafion/polypyrroleorganieeoatingsresultedintheeorr osionr esistaneeofmagnesiumdeer easing:whi leNafion/DMSOorg
2、anieeoatingseanefF eetivelyi mprovetheeorrosionresistanCeofmagnesium.Also,thecorr osionresistaneeinereasedwiththethieknessoftheNafion/DMSOorganiecoatingincreased.KEYVVORDS:Magnesium;N曲on/pol ypyrroleor,nie eoatings;N胡on/DMS0o馆anieeo atin邵;CorrosionresistaneeMa gnesiumhas ahi ghstrength一to一wei ghtrat
3、iowi thadensi tythat15onlyZ/3tha tofalumim imand1/4thatofiron.Magl l esiuma lsoha shi ghthermaleonduetivi tv.highdimensionalsta bil itv.and15easilvreCyCl eQ“J.I n e s eP拍PertleSmaKe l石、吸IU a D丈 eIna丈 o tofaP Pliea tio n ss u eha sa utomobile,eomPuterPa rtsandairera f teomPonents.How ev er,magnesiumh
4、asanux x lberofdisadvantagesineludingPooreorrosionresistaneeandhi ghehemiealreaet ivitytha thavelim-i tedi tswidesPr eaduse.Oneofthemainehal lengesintheuseofmagnesium,Partieularl yf oroutdoorappl i-eat ions,15i tspooreorrosionresistanee2一1 0,thusi t15ofsi gnif ieantseien tif ieandPraetiealin terestt
5、ostudyho wtoproteetmag nesiuma lloysf romeor rosion.Oneofthemoste俄etivewa ystoPreventeorro-sion15to eoa tthebasematerial.Coa tings eanProteeta substrateby Providingabarrierbetweenthemetalandi ts environmentand加rthroughthepresenee ofeorrosioninhibitors.In orderf or a eoating toPro-vide adeq uate eorr
6、osionProteetion,theeoa tingmustbeunif orm,wel ladhered,Poref reeandsel f-heal ingf oraPPlieationswherePh ysiealdamagetotheeoat-ingma yoeeur.OneoftheProblemswi thmagnesiumandi tsalloys15i tsehemiealreaetivi ty.AssoonasitcomesincontaCtwithairorwa teranoxide/hydroxidel盯erf orms onthe surf aeewhieheax i
7、ha ve adetrimen-ta lef f eeton eoatingadhesion andunif ormity.Up ti llnow,thereha vebeenanumberofPossibleeoatingteehnologiesa v ailablef orma gnesiumandi tsal loys,wi ththeirindividua ladv an t眼esand disadvant铭es1.Condueting Polymers asPromisingmaterials,esPe-eial lypoly伴rrole,ineorrosionproteet ion
8、a restud iedonsuehasir on,steel,AI,Ti,andzn11一1 71duetoi tshi ghstabili t yinair,adhesionandinterest ingredo xProPertieswi thsubstra te,butthere15lessr esearehea rriedoutonma“n e siuma nditsallo v sli s,19.Re-eently,T ruongetal.120ha vestu(liedtheeorrosiontPr of.,Ph.D.,towhomeor r esPondene eshoul d
9、beaddr e ss ed,E一mail:songrg回 16 3.eom.Proteetio nofa na ery liePainteo ntainingPoly P yrrolef i lmo nmagn e siuma l loybyc hemiea lmethod,butthef il mwasnon一unif ormandPooradhesive.Theref ore,i t15neeessarytodeveloPnovelorganieeoa tingsf ormag-nesiumanditsal lo ys.Inthisnote,Na f ion/poly那rroleand
10、Naf ion/Dimethysul f oxid(DMSO)orga nie eoat-ings onmagnesiumha v ebeenPreParedb ysimPleim-mersion andheat treatment,andi tseorrosionresis-taneeandmorPhologiesha vebeena lsostudied.Thebasemetalusedinthisstudy15in-dustrialPuremagnesiumsheet.Theeonten tofNa f ion/polypyr rolesolutionwa ss%polypyrroleb
11、ywei ght,whileNa f ion/DMSOsolutionwas5partsofNaf ionethanolsolution(5%bywei ght)to1pa rtofDMSObyvolume.Thema gnesiums amPleswerePol-ishedusingSICpaperswi thagri tsizef rom400to1000,andthenw ereeleanedwithaeetonePriortopreparingtheorganieeoat ings.Theeoat ingsw er ef ormedaf terimmersionintheNa f io
12、n/polypyr roleorNa f ion/DMSOsolutionf or105,anddriedina nelee-trief urnaeeimmedia telyat373Kf or5minorat423Kf or2h.ThesamPleswi thdif f erenteoatingthieknesswereobta inedbyintermediatedryingandr eeoatingseveraltimes.Theeoat ingma sswa smea suredbyeleetronieba l-aneewi thanaeeuraeyof0.01mg.Thesurf a
13、eedensi tyoftheeoatingwasusedtodenotetheeoat ingthie卜neSS.PotentiodynamiePolariz就ionmeasu rementsw ereearriedoutf orbothun eo atedandeoatedsPeeimen s,whiehwerePerf ormedwi thaeonventionalthree-eleetrodeeellinambienttemPerature.API歌inumsheetanda satura tedealomeleleetrode(S C E)wereu sedas eounter an
14、dref eren ee eleetrode,resPeetively.Theeleetrolytietestsolutioneontaineds%NaCIatapHof11.Thea reaoftheworkingeleetrodesur f aeewas1.039emZinsizeand11.55mmindia meter.Thesurf aeeoftheuneoatedspeeimenwasgroundbyasiCpaperswi thagri tsizeof1000.Thepotentiodyna mie,V ol.23No.1,2007Thble1Thieknessesandeorr
15、osionpropertiesofuneoatedandeoatedma gnesiumspeeiniensSPeeimenSolutionImmersionti mesHeattreatmentThiekness/(mg/emZ)CorrosionrateCorrosioneurrent/h/(mm/yea r)6 56 12 8 0 93 5 3 4 5 8曰.lq山一.上q白nUo nq 月吮aC J,1,翻q 白q 乙q 乙q40口n曰n U C 曰U1 1n U C U一0Naf io n/poly p yr r olelNa f io n/poly p yr r oleZNaf i
16、o n/poly p yr r ole3Naf io n/DMS OINa f io n/DMS OZNaf io n/DMS O33 7 33 7 33 7 34 2 34 2 34 2 3/mA0.0 8 8 70.14 0 20.0 8 4 50.1 26 20.01810.0 1490.0 0 4 8A B C D E F GFig.1Mo rpholog ie sofu n e o ateda nde o atedorga niee o atingBef or ee orr o sio n:(a)u n e oa ted,(e)na f ion/poly可rrole(d)na f ion/poly讨rrole,(f)naf ion/DMSO5onmagnesiumbef oreandaf tereor rosiontests.(e)naf ion/DMSO;a f tereorrosion:(b)uneoated,Pola rizationseanningsw erestarteda t一0.25Vrel-ativ etotherestPotentialwhiehwa sde
