1. Txheej txheej
Txhawm rau pab txhawb kev kuaj electrochemical tom qab, 30mm yog xaiv × 4 hli 304 stainless hlau ua lub hauv paus.Polish thiab tshem tawm cov seem oxide txheej thiab xeb me ntsis rau ntawm qhov chaw ntawm lub substrate nrog sandpaper, muab tso rau hauv lub beaker uas muaj acetone, kho cov stains ntawm lub substrate nrog bg-06c ultrasonic nqus tsev vacuum ntawm Bangjie electronics tuam txhab rau 20min, tshem tawm. hnav cov khib nyiab ntawm qhov chaw ntawm cov hlau substrate nrog cawv thiab dej distilled, thiab qhuav lawv nrog lub tshuab cua.Tom qab ntawd, alumina (Al2O3), graphene thiab hybrid carbon nanotube (mwnt-coohsdbs) tau npaj rau hauv kev faib ua feem (100: 0: 0, 99.8: 0.2: 0, 99.8: 0: 0.2, 99.6: 0.2: 0.2), thiab muab tso rau hauv lub pob zeb (qm-3sp2 ntawm Nanjing NANDA ntsuas Hoobkas) rau pob milling thiab sib tov.Kev sib hloov ceev ntawm lub pob zeb tau teem rau 220 R / min, thiab lub pob zeb tau tig mus rau
Tom qab lub pob milling, teeb tsa qhov kev sib hloov ceev ntawm lub pob milling tank ua 1 / 2 alternately tom qab lub pob milling tiav, thiab teem caij sib hloov ceev ntawm lub pob milling tank yuav tsum 1 / 2 alternately tom qab lub pob milling tiav.Lub pob milled ceramic aggregate thiab binder yog sib xyaw ua ke raws li qhov loj ntawm 1.0 ∶ 0.8.Thaum kawg, cov nplaum ceramic txheej tau txais los ntawm kev kho cov txheej txheem.
2. Kev kuaj corrosion
Nyob rau hauv txoj kev tshawb no, qhov kev ntsuam xyuas electrochemical corrosion txais Shanghai Chenhua chi660e electrochemical workstation, thiab qhov kev ntsuam xyuas tau txais peb lub electrode xeem system.Lub platinum electrode yog cov khoom siv hluav taws xob, cov nyiaj chloride electrode yog cov khoom siv hluav taws xob, thiab cov qauv coated yog cov electrode ua haujlwm, nrog rau thaj tsam zoo ntawm 1cm2.Txuas cov khoom siv electrode, ua haujlwm electrode thiab auxiliary electrode nyob rau hauv lub electrolytic cell nrog lub ntsuas, raws li qhia nyob rau hauv daim duab 1 thiab 2. Ua ntej qhov kev xeem, tsau cov qauv hauv cov electrolyte, uas yog 3.5% NaCl tov.
3. Tafel tsom xam ntawm electrochemical corrosion ntawm coatings
Daim duab 3 qhia tau hais tias Tafel nkhaus ntawm uncoated substrate thiab ceramic txheej coated nrog sib txawv nano additives tom qab electrochemical corrosion rau 19h.Cov ntaub ntawv tiv thaiv corrosion, corrosion tam sim no ceev thiab hluav taws xob impedance xeem cov ntaub ntawv tau los ntawm electrochemical corrosion test yog qhia nyob rau hauv Table 1.
Xa
Thaum lub corrosion tam sim no ceev me me thiab cov corrosion kuj efficiency siab dua, corrosion kuj nyhuv ntawm txheej yog zoo dua.Nws tuaj yeem pom los ntawm daim duab 3 thiab cov lus 1 tias thaum lub sijhawm corrosion yog 19h, qhov siab tshaj plaws corrosion voltage ntawm liab qab hlau matrix yog -0.680 V, thiab corrosion tam sim no ntom ntawm matrix kuj yog qhov loj tshaj plaws, ncav cuag 2.890 × 10-6 A. / cm2 .Thaum coated nrog ntshiab alumina ceramic txheej, corrosion tam sim no ceev txo mus rau 78% thiab PE yog 22.01%.Nws qhia tau hais tias cov txheej txheem ceramic plays lub luag haujlwm tiv thaiv zoo dua thiab tuaj yeem txhim kho corrosion kuj ntawm txheej hauv nruab nrab electrolyte.
Thaum 0.2% mwnt-cooh-sdbs los yog 0.2% graphene tau ntxiv rau txheej, corrosion tam sim no ntom ntom, qhov tsis kam nce, thiab corrosion kuj ntawm cov txheej tau ntxiv txhim kho, nrog PE ntawm 38.48% thiab 40.10% feem.Thaum lub npoo yog coated nrog 0.2% mwnt-cooh-sdbs thiab 0.2% graphene tov alumina txheej, corrosion tam sim no ntxiv txo los ntawm 2.890 × 10-6 A / cm2 mus rau 1.536 × 10-6 A / cm2, qhov siab tshaj plaws kuj tus nqi, nce ntawm 11388 Ω mus rau 28079 Ω, thiab PE ntawm txheej tuaj yeem ncav cuag 46.85%.Nws qhia tau hais tias cov khoom lag luam npaj tau zoo corrosion kuj, thiab cov nyhuv synergistic ntawm carbon nanotubes thiab graphene tuaj yeem txhim kho corrosion kuj ntawm ceramic txheej.
4. Cov nyhuv ntawm lub sij hawm soaking rau txheej impedance
Txhawm rau txhawm rau tshawb nrhiav qhov kev tiv thaiv corrosion ntawm txheej txheej, xav txog kev cuam tshuam ntawm lub sijhawm immersion ntawm cov qauv hauv cov electrolyte ntawm qhov kev sim, qhov kev hloov nkhaus ntawm qhov tsis kam ntawm plaub txheej ntawm lub sijhawm sib txawv yog tau txais, raws li qhia hauv daim duab. 4.
Xa
Nyob rau theem pib ntawm immersion (10 h), vim qhov ntom ntom zoo thiab cov qauv ntawm cov txheej, cov electrolyte tsis yooj yim rau kev nkag mus rau hauv txheej.Lub sijhawm no, cov txheej txheem ceramic qhia tau hais tias muaj kev tiv thaiv siab.Tom qab soaking rau ib lub sij hawm ntawm lub sij hawm, qhov tsis kam txo qis, vim hais tias thaum lub sij hawm dhau mus, cov electrolyte maj mam tsim ib tug corrosion channel los ntawm lub qhov hws thiab tawg nyob rau hauv lub txheej thiab nkag mus rau hauv lub matrix, uas ua rau ib tug tseem ceeb txo nyob rau hauv tsis kam. cov txheej.
Nyob rau theem thib ob, thaum cov khoom siv corrosion nce mus rau qee qhov nyiaj, qhov sib txawv yog thaiv thiab qhov sib txawv yog maj mam thaiv.Nyob rau tib lub sijhawm, thaum cov electrolyte nkag mus rau hauv kev sib txuas sib txuas ntawm kev sib txuas hauv qab txheej / matrix, cov dej molecules yuav hnov mob nrog Fe keeb hauv matrix ntawm txheej / matrix hlws ris los tsim cov hlau oxide nyias, uas cuam tshuam cov nkag mus ntawm cov electrolyte rau hauv matrix thiab ua rau kom tus nqi kuj nce.Thaum cov hlau liab liab matrix yog electrochemically corroded, feem ntau ntawm cov ntsuab flocculent nag lossis daus yog tsim nyob rau hauv qab ntawm cov electrolyte.Cov tshuaj electrolytic tsis hloov xim thaum electrolyzing cov qauv coated, uas tuaj yeem ua pov thawj tias muaj cov tshuaj tiv thaiv saum toj no.
Vim lub sij hawm luv luv thiab qhov cuam tshuam loj rau sab nraud, txhawm rau kom tau txais qhov tseeb hloov pauv kev sib raug zoo ntawm electrochemical tsis, Tafel nkhaus ntawm 19 h thiab 19.5 h raug tshuaj xyuas.Lub corrosion tam sim no ceev thiab kuj tau los ntawm zsimpwin tsom xam software yog qhia nyob rau hauv Table 2. Nws yuav pom tau hais tias thaum soaked rau 19 h, piv nrog rau liab qab substrate, corrosion tam sim no ceev ntawm ntshiab alumina thiab alumina composite txheej uas muaj nano additive cov ntaub ntawv yog. me me thiab tus nqi kuj yog loj dua.Qhov kev tiv thaiv tus nqi ntawm cov txheej txheem ceramic uas muaj cov pa roj carbon nanotubes thiab txheej uas muaj graphene yuav luag zoo ib yam, thaum txheej txheej txheej nrog cov pa roj carbon nanotubes thiab graphene cov ntaub ntawv sib xyaw ua kom zoo dua qub, Qhov no yog vim muaj kev sib koom ua ke ntawm ib-dimensional carbon nanotubes thiab ob-dimensional graphene. txhim kho corrosion kuj ntawm cov khoom.
Nrog rau qhov nce ntawm lub sij hawm immersion (19.5 h), qhov tsis kam ntawm liab qab substrate nce, qhia tau hais tias nws yog nyob rau hauv lub thib ob theem ntawm corrosion thiab hlau oxide zaj duab xis yog tsim nyob rau saum npoo ntawm substrate.Ib yam li ntawd, nrog rau lub sij hawm nce, qhov tsis kam ntawm cov ntshiab alumina ceramic txheej kuj nce ntxiv, qhia tias lub sijhawm no, txawm hais tias muaj cov nyhuv qeeb ntawm cov txheej txheem ceramic, cov electrolyte tau nkag mus rau qhov sib txuas ntawm kev sib txuas ntawm cov txheej / matrix, thiab tsim oxide zaj duab xis. los ntawm cov tshuaj tiv thaiv.
Piv nrog rau alumina txheej uas muaj 0.2% mwnt-cooh-sdbs, alumina txheej uas muaj 0.2% graphene thiab alumina txheej uas muaj 0.2% mwnt-cooh-sdbs thiab 0.2% graphene, cov txheej tiv thaiv tau txo qis nrog qhov nce ntawm lub sijhawm, txo. los ntawm 22.94%, 25.60% thiab 9.61% raws li qhia tau hais tias cov electrolyte tsis nkag mus rau hauv kev sib koom ua ke ntawm txheej thiab substrate nyob rau lub sij hawm no, Qhov no yog vim hais tias cov qauv ntawm carbon nanotubes thiab graphene blocks downward nkag ntawm electrolyte, yog li tiv thaiv. lub matrix.Qhov kev sib koom ua ke ntawm ob qho kev txheeb xyuas ntxiv.Cov txheej uas muaj ob cov ntaub ntawv nano muaj kev tiv thaiv corrosion zoo dua.
Los ntawm Tafel nkhaus thiab kev hloov nkhaus ntawm cov hluav taws xob impedance tus nqi, nws pom tias alumina ceramic txheej nrog graphene, carbon nanotubes thiab lawv cov sib tov tuaj yeem txhim kho corrosion kuj ntawm hlau matrix, thiab cov nyhuv synergistic ntawm ob tuaj yeem txhim kho corrosion ntxiv. tsis kam ntawm nplaum ceramic txheej.Txhawm rau tshawb nrhiav ntxiv cov txiaj ntsig ntawm nano additives ntawm kev tiv thaiv corrosion ntawm txheej, micro deg morphology ntawm txheej tom qab corrosion tau pom.
Xa
Daim duab 5 (A1, A2, B1, B2) qhia qhov chaw morphology ntawm raug 304 stainless hlau thiab coated ntshiab alumina ceramics ntawm txawv magnification tom qab corrosion.Daim duab 5 (A2) qhia tias qhov chaw tom qab corrosion ua ntxhib.Rau qhov liab qab substrate, ob peb qhov loj corrosion pits tshwm nyob rau saum npoo tom qab immersion nyob rau hauv electrolyte, qhia tau hais tias corrosion kuj ntawm liab qab hlau matrix yog tsis zoo thiab cov electrolyte yog ib qho yooj yim rau nkag mus rau hauv lub matrix.Rau cov ntshiab alumina ceramic txheej, raws li pom nyob rau hauv daim duab 5 (B2), txawm hais tias ntxeem tau corrosion raws yog generated tom qab corrosion, tus kuj ntom qauv thiab zoo heev corrosion kuj ntawm ntshiab alumina ceramic txheej zoo thaiv qhov ntxeem tau ntawm electrolyte, uas piav qhia txog qhov laj thawj rau qhov Kev txhim kho zoo ntawm impedance ntawm alumina ceramic txheej.
Xa
Surface morphology ntawm mwnt-cooh-sdbs, coatings muaj 0.2% graphene thiab coatings muaj 0.2% mwnt-cooh-sdbs thiab 0.2% graphene.Nws tuaj yeem pom tau tias ob txheej txheej uas muaj graphene hauv daim duab 6 (B2 thiab C2) muaj cov qauv tiaj tus, kev khi ntawm cov khoom hauv cov txheej yog nruj, thiab cov khoom sib xyaw yog nruj nreem qhwv los ntawm cov nplaum.Txawm hais tias qhov saum npoo yog eroded los ntawm electrolyte, tsawg pore raws yog tsim.Tom qab corrosion, txheej txheej yog ntom thiab muaj ob peb cov qauv tsis xws luag.Rau daim duab 6 (A1, A2), vim yog cov yam ntxwv ntawm mwnt-cooh-sdbs, txheej txheej ua ntej corrosion yog ib qho kev sib faib ntxeem tau.Tom qab corrosion, lub pores ntawm thawj qhov chaw yuav nqaim thiab ntev, thiab cov channel yuav ntxaum.Piv nrog rau daim duab 6 (B2, C2), cov qauv muaj ntau qhov tsis xws luag, uas yog raws li qhov loj me ntawm txheej impedance tus nqi tau los ntawm electrochemical corrosion test.Nws qhia tau hais tias alumina ceramic txheej uas muaj graphene, tshwj xeeb tshaj yog sib xyaw ntawm graphene thiab carbon nanotube, muaj qhov zoo tshaj plaws corrosion kuj.Qhov no yog vim cov qauv ntawm cov pa roj carbon nanotube thiab graphene tuaj yeem thaiv qhov tawg tawg thiab tiv thaiv matrix.
5. Kev sib tham thiab cov ntsiab lus
Los ntawm kev ntsuas kev tiv thaiv corrosion ntawm cov pa roj carbon nanotubes thiab graphene additives ntawm alumina ceramic txheej thiab kev tsom xam ntawm qhov chaw microstructure ntawm txheej, cov lus xaus hauv qab no tau kos:
(1) Thaum lub sij hawm corrosion yog 19 h, ntxiv 0.2% hybrid carbon nanotube + 0.2% graphene tov khoom alumina ceramic txheej, corrosion tam sim no ceev ntawm 2.890 × 10-6 A / cm2 mus rau 1.536 × 10-6 A / cm2, hluav taws xob impedance yog nce los ntawm 11388 Ω mus rau 28079 Ω, thiab corrosion kuj efficiency yog qhov loj tshaj plaws, 46.85%.Piv nrog cov ntshiab alumina ceramic txheej, cov txheej txheem sib xyaw nrog graphene thiab carbon nanotubes muaj kev tiv thaiv corrosion zoo dua.
(2) Nrog rau qhov nce ntawm lub sijhawm immersion ntawm electrolyte, cov electrolyte nkag mus rau hauv qhov sib koom ua ke ntawm txheej / substrate los tsim cov hlau oxide zaj duab xis, uas cuam tshuam kev nkag mus ntawm electrolyte rau hauv substrate.Cov hluav taws xob impedance ua ntej txo qis thiab tom qab ntawd nce, thiab corrosion kuj ntawm ntshiab alumina ceramic txheej yog pluag.Cov qauv thiab kev sib koom ua ke ntawm cov pa roj carbon nanotubes thiab graphene thaiv kev nkag mus ntawm electrolyte downward.Thaum soaked rau 19.5 h, hluav taws xob impedance ntawm txheej uas muaj cov ntaub ntawv nano txo los ntawm 22.94%, 25.60% thiab 9.61% raws li, thiab corrosion kuj ntawm txheej yog zoo.
6. cuam tshuam mechanism ntawm txheej corrosion kuj
Los ntawm Tafel nkhaus thiab kev hloov nkhaus ntawm cov hluav taws xob impedance tus nqi, nws pom tias alumina ceramic txheej nrog graphene, carbon nanotubes thiab lawv cov sib tov tuaj yeem txhim kho corrosion kuj ntawm hlau matrix, thiab cov nyhuv synergistic ntawm ob tuaj yeem txhim kho corrosion ntxiv. tsis kam ntawm nplaum ceramic txheej.Txhawm rau tshawb nrhiav ntxiv cov txiaj ntsig ntawm nano additives ntawm kev tiv thaiv corrosion ntawm txheej, micro deg morphology ntawm txheej tom qab corrosion tau pom.
Daim duab 5 (A1, A2, B1, B2) qhia qhov chaw morphology ntawm raug 304 stainless hlau thiab coated ntshiab alumina ceramics ntawm txawv magnification tom qab corrosion.Daim duab 5 (A2) qhia tias qhov chaw tom qab corrosion ua ntxhib.Rau qhov liab qab substrate, ob peb qhov loj corrosion pits tshwm nyob rau saum npoo tom qab immersion nyob rau hauv electrolyte, qhia tau hais tias corrosion kuj ntawm liab qab hlau matrix yog tsis zoo thiab cov electrolyte yog ib qho yooj yim rau nkag mus rau hauv lub matrix.Rau cov ntshiab alumina ceramic txheej, raws li pom nyob rau hauv daim duab 5 (B2), txawm hais tias ntxeem tau corrosion raws yog generated tom qab corrosion, tus kuj ntom qauv thiab zoo heev corrosion kuj ntawm ntshiab alumina ceramic txheej zoo thaiv qhov ntxeem tau ntawm electrolyte, uas piav qhia txog qhov laj thawj rau qhov Kev txhim kho zoo ntawm impedance ntawm alumina ceramic txheej.
Surface morphology ntawm mwnt-cooh-sdbs, coatings muaj 0.2% graphene thiab coatings muaj 0.2% mwnt-cooh-sdbs thiab 0.2% graphene.Nws tuaj yeem pom tau tias ob txheej txheej uas muaj graphene hauv daim duab 6 (B2 thiab C2) muaj cov qauv tiaj tus, kev khi ntawm cov khoom hauv cov txheej yog nruj, thiab cov khoom sib xyaw yog nruj nreem qhwv los ntawm cov nplaum.Txawm hais tias qhov saum npoo yog eroded los ntawm electrolyte, tsawg pore raws yog tsim.Tom qab corrosion, txheej txheej yog ntom thiab muaj ob peb cov qauv tsis xws luag.Rau daim duab 6 (A1, A2), vim yog cov yam ntxwv ntawm mwnt-cooh-sdbs, txheej txheej ua ntej corrosion yog ib qho kev sib faib ntxeem tau.Tom qab corrosion, lub pores ntawm thawj qhov chaw yuav nqaim thiab ntev, thiab cov channel yuav ntxaum.Piv nrog rau daim duab 6 (B2, C2), cov qauv muaj ntau qhov tsis xws luag, uas yog raws li qhov loj me ntawm txheej impedance tus nqi tau los ntawm electrochemical corrosion test.Nws qhia tau hais tias alumina ceramic txheej uas muaj graphene, tshwj xeeb tshaj yog sib xyaw ntawm graphene thiab carbon nanotube, muaj qhov zoo tshaj plaws corrosion kuj.Qhov no yog vim cov qauv ntawm cov pa roj carbon nanotube thiab graphene tuaj yeem thaiv qhov tawg tawg thiab tiv thaiv matrix.
7. Kev sib tham thiab cov ntsiab lus
Los ntawm kev ntsuas kev tiv thaiv corrosion ntawm cov pa roj carbon nanotubes thiab graphene additives ntawm alumina ceramic txheej thiab kev tsom xam ntawm qhov chaw microstructure ntawm txheej, cov lus xaus hauv qab no tau kos:
(1) Thaum lub sij hawm corrosion yog 19 h, ntxiv 0.2% hybrid carbon nanotube + 0.2% graphene tov khoom alumina ceramic txheej, corrosion tam sim no ceev ntawm 2.890 × 10-6 A / cm2 mus rau 1.536 × 10-6 A / cm2, hluav taws xob impedance yog nce los ntawm 11388 Ω mus rau 28079 Ω, thiab corrosion kuj efficiency yog qhov loj tshaj plaws, 46.85%.Piv nrog cov ntshiab alumina ceramic txheej, cov txheej txheem sib xyaw nrog graphene thiab carbon nanotubes muaj kev tiv thaiv corrosion zoo dua.
(2) Nrog rau qhov nce ntawm lub sijhawm immersion ntawm electrolyte, cov electrolyte nkag mus rau hauv qhov sib koom ua ke ntawm txheej / substrate los tsim cov hlau oxide zaj duab xis, uas cuam tshuam kev nkag mus ntawm electrolyte rau hauv substrate.Cov hluav taws xob impedance ua ntej txo qis thiab tom qab ntawd nce, thiab corrosion kuj ntawm ntshiab alumina ceramic txheej yog pluag.Cov qauv thiab kev sib koom ua ke ntawm cov pa roj carbon nanotubes thiab graphene thaiv kev nkag mus ntawm electrolyte downward.Thaum soaked rau 19.5 h, hluav taws xob impedance ntawm txheej uas muaj cov ntaub ntawv nano txo los ntawm 22.94%, 25.60% thiab 9.61% raws li, thiab corrosion kuj ntawm txheej yog zoo.
(3) Vim yog cov yam ntxwv ntawm cov pa roj carbon nanotubes, txheej ntxiv nrog cov pa roj carbon nanotubes ib leeg muaj cov qauv sib xyaw ua ke ua ntej corrosion.Tom qab corrosion, lub pores ntawm thawj qhov chaw yuav nqaim thiab ntev, thiab cov channel ua tob.Cov txheej uas muaj graphene muaj cov qauv tiaj tus ua ntej corrosion, kev sib xyaw ua ke ntawm cov khoom hauv cov txheej yog kaw, thiab cov khoom sib xyaw ua ke yog nruj nreem qhwv los ntawm cov nplaum.Txawm hais tias qhov saum npoo yog eroded los ntawm electrolyte tom qab corrosion, muaj ob peb pore raws thiab cov qauv tseem ntom.Cov qauv ntawm cov pa roj carbon nanotubes thiab graphene tuaj yeem thaiv qhov tawg tawm thiab tiv thaiv cov matrix.
Post lub sij hawm: Mar-09-2022