1. Kev npaj txheej
Yuav kom yooj yim rau kev sim electrochemical tom qab, 30 hli yog xaiv × 4 hli 304 stainless hlau ua lub hauv paus. Txhuam thiab tshem tawm cov txheej oxide seem thiab cov xeb ntawm qhov chaw ntawm lub substrate nrog sandpaper, muab tso rau hauv lub beaker uas muaj acetone, kho cov xim ntawm qhov chaw ntawm lub substrate nrog bg-06c ultrasonic cleaner ntawm Bangjie electronics lub tuam txhab rau 20 feeb, tshem tawm cov khib nyiab hnav ntawm qhov chaw ntawm cov hlau substrate nrog cawv thiab dej distilled, thiab ziab lawv nrog lub tshuab cua. Tom qab ntawd, alumina (Al2O3), graphene thiab hybrid carbon nanotube (mwnt-coohsdbs) tau npaj ua ke (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 instrument factory) rau kev sib tsoo pob thiab sib tov. Qhov ceev ntawm lub pob zeb tau teeb tsa rau 220 R / min, thiab lub pob zeb tau tig mus rau
Tom qab pob zeb sib tsoo, teeb tsa qhov ceev ntawm lub tank sib tsoo pob zeb kom yog 1/2 hloov pauv tom qab pob zeb sib tsoo tiav lawm, thiab teeb tsa qhov ceev ntawm lub tank sib tsoo pob zeb kom yog 1/2 hloov pauv tom qab pob zeb sib tsoo tiav lawm. Cov pob zeb sib xyaw ua ke thiab cov khoom sib txuas tau sib xyaw sib npaug raws li qhov feem pua ntawm 1.0 ∶ 0.8. Thaum kawg, cov txheej txheem nplaum ceramic tau txais los ntawm cov txheej txheem kho.
2. Kev kuaj xeb
Hauv kev tshawb fawb no, kev sim tshuaj electrochemical corrosion siv Shanghai Chenhua chi660e electrochemical workstation, thiab kev sim siv peb lub electrode test system. Lub platinum electrode yog lub auxiliary electrode, lub silver silver chloride electrode yog lub reference electrode, thiab cov qauv coated yog lub working electrode, nrog thaj chaw zoo ntawm 1cm2. Txuas lub reference electrode, ua haujlwm electrode thiab auxiliary electrode hauv lub electrolytic cell nrog lub cuab yeej, raws li pom hauv Daim Duab 1 thiab 2. Ua ntej kev sim, muab cov qauv tso rau hauv electrolyte, uas yog 3.5% NaCl kua.
3. Tafel kev tshuaj xyuas ntawm electrochemical corrosion ntawm coatings
Daim Duab 3 qhia txog Tafel nkhaus ntawm cov khoom siv tsis muaj txheej thiab cov txheej ceramic uas tau coated nrog cov khoom siv nano sib txawv tom qab electrochemical corrosion rau 19 teev. Cov ntaub ntawv kuaj hluav taws xob corrosion, corrosion tam sim no density thiab hluav taws xob impedance tau los ntawm electrochemical corrosion test tau qhia hauv Rooj 1.
Xa
Thaum qhov ceev tam sim no corrosion me dua thiab qhov ua haujlwm tiv thaiv corrosion siab dua, qhov cuam tshuam tiv thaiv corrosion ntawm cov txheej txheej zoo dua. Nws tuaj yeem pom los ntawm Daim Duab 3 thiab lub rooj 1 tias thaum lub sijhawm corrosion yog 19h, qhov siab tshaj plaws corrosion voltage ntawm cov hlau liab qab matrix yog -0.680 V, thiab qhov ceev tam sim no corrosion ntawm matrix kuj yog qhov loj tshaj plaws, ncav cuag 2.890 × 10-6 A / cm2 。 Thaum coated nrog pure alumina ceramic txheej, qhov ceev tam sim no corrosion txo qis mus rau 78% thiab PE yog 22.01%. Nws qhia tau hais tias cov txheej ceramic ua lub luag haujlwm tiv thaiv zoo dua thiab tuaj yeem txhim kho qhov corrosion tsis kam ntawm cov txheej hauv neutral electrolyte.
Thaum ntxiv 0.2% mwnt-cooh-sdbs lossis 0.2% graphene rau hauv txheej, qhov ceev ntawm kev xeb tam sim no txo qis, qhov kev tiv thaiv nce ntxiv, thiab qhov kev tiv thaiv xeb ntawm txheej tau txhim kho ntxiv, nrog PE ntawm 38.48% thiab 40.10% feem. Thaum txheej saum npoo nrog 0.2% mwnt-cooh-sdbs thiab 0.2% graphene sib xyaw alumina txheej, qhov kev xeb tam sim no txo qis ntxiv los ntawm 2.890 × 10-6 A / cm2 mus rau 1.536 × 10-6 A / cm2, qhov siab tshaj plaws tsis kam, nce los ntawm 11388 Ω mus rau 28079 Ω, thiab PE ntawm txheej tuaj yeem ncav cuag 46.85%. Nws qhia tau hais tias cov khoom npaj tau muaj kev tiv thaiv xeb zoo, thiab cov nyhuv synergistic ntawm carbon nanotubes thiab graphene tuaj yeem txhim kho qhov kev tiv thaiv xeb ntawm cov txheej ceramic.
4. Cov nyhuv ntawm lub sijhawm soaking rau ntawm txheej impedance
Yuav kom tshawb nrhiav ntxiv txog kev tiv thaiv xeb ntawm cov txheej, xav txog qhov cuam tshuam ntawm lub sijhawm immersion ntawm cov qauv hauv electrolyte ntawm qhov kev xeem, cov kab hloov pauv ntawm qhov tsis kam ntawm plaub lub txheej ntawm lub sijhawm immersion sib txawv tau txais, raws li pom hauv Daim Duab 4.
Xa
Thaum pib ntawm kev muab tso rau hauv dej (10 teev), vim yog qhov ceev thiab cov qauv ntawm cov txheej, cov electrolyte nyuaj rau muab tso rau hauv cov txheej. Lub sijhawm no, cov txheej ceramic qhia tau tias muaj kev tiv thaiv siab. Tom qab muab tso rau hauv dej rau ib lub sijhawm, qhov kev tiv thaiv txo qis heev, vim tias nrog lub sijhawm dhau mus, cov electrolyte maj mam tsim cov channel corrosion los ntawm cov qhov thiab cov kab nrib pleb hauv cov txheej thiab nkag mus rau hauv lub matrix, ua rau muaj kev txo qis ntawm qhov kev tiv thaiv ntawm cov txheej.
Hauv theem ob, thaum cov khoom xeb nce mus txog qee qhov, qhov kev sib kis raug thaiv thiab qhov sib txawv maj mam raug thaiv. Tib lub sijhawm, thaum cov electrolyte nkag mus rau hauv qhov sib txuas ntawm cov txheej hauv qab / matrix, cov dej molecules yuav cuam tshuam nrog Fe element hauv matrix ntawm qhov txheej / matrix sib tshuam los tsim cov yeeb yaj kiab hlau oxide nyias, uas cuam tshuam kev nkag mus ntawm cov electrolyte rau hauv matrix thiab ua rau tus nqi tsis kam nce. Thaum cov hlau matrix liab qab raug electrochemically corroded, feem ntau ntawm cov dej nag ntsuab flocculent yog tsim nyob rau hauv qab ntawm cov electrolyte. Cov kua electrolytic tsis hloov xim thaum electrolyzing cov qauv coated, uas tuaj yeem ua pov thawj qhov muaj nyob ntawm cov tshuaj tiv thaiv saum toj no.
Vim yog lub sijhawm luv luv ntawm kev tsau thiab cov yam ntxwv sab nraud loj, txhawm rau kom tau txais qhov kev hloov pauv tseeb ntawm cov kev ntsuas electrochemical, cov kab Tafel ntawm 19 teev thiab 19.5 teev raug tshuaj xyuas. Qhov ceev tam sim no corrosion thiab kev tiv thaiv tau los ntawm zsimpwin tshuaj xyuas software tau qhia hauv Rooj 2. Nws tuaj yeem pom tias thaum tsau rau 19 teev, piv nrog cov substrate liab qab, qhov ceev tam sim no corrosion ntawm alumina ntshiab thiab alumina composite txheej uas muaj cov ntaub ntawv nano additive me dua thiab tus nqi tiv thaiv loj dua. Tus nqi tiv thaiv ntawm cov txheej txheem ceramic uas muaj cov nanotubes carbon thiab txheej uas muaj graphene yuav luag zoo ib yam, thaum cov qauv txheej nrog cov nanotubes carbon thiab graphene composite cov ntaub ntawv tau txhim kho ntau heev, Qhov no yog vim tias cov nyhuv synergistic ntawm ib-seem carbon nanotubes thiab ob-seem graphene txhim kho qhov kev tiv thaiv corrosion ntawm cov khoom.
Nrog rau qhov nce ntawm lub sijhawm immersion (19.5 teev), qhov kev tiv thaiv ntawm cov substrate liab qab nce ntxiv, qhia tias nws nyob rau theem ob ntawm corrosion thiab hlau oxide zaj duab xis yog tsim rau ntawm qhov chaw ntawm substrate. Ib yam li ntawd, nrog rau qhov nce ntawm lub sijhawm, qhov kev tiv thaiv ntawm cov alumina ceramic txheej kuj nce ntxiv, qhia tias lub sijhawm no, txawm hais tias muaj qhov qeeb ntawm cov txheej ceramic, cov electrolyte tau nkag mus rau hauv qhov sib txuas ntawm cov txheej / matrix, thiab tsim cov zaj duab xis oxide los ntawm kev tshuaj lom neeg.
Piv nrog rau cov txheej alumina uas muaj 0.2% mwnt-cooh-sdbs, cov txheej alumina uas muaj 0.2% graphene thiab cov txheej alumina uas muaj 0.2% mwnt-cooh-sdbs thiab 0.2% graphene, qhov tsis kam ntawm cov txheej tau txo qis ntau nrog rau lub sijhawm nce ntxiv, txo qis los ntawm 22.94%, 25.60% thiab 9.61% feem, qhia tias cov electrolyte tsis nkag mus rau hauv qhov sib koom ua ke ntawm cov txheej thiab cov substrate thaum lub sijhawm no, Qhov no yog vim tias cov qauv ntawm cov pa roj carbon nanotubes thiab graphene thaiv qhov nkag mus rau hauv qab ntawm cov electrolyte, yog li tiv thaiv cov matrix. Qhov cuam tshuam synergistic ntawm ob qho tau txheeb xyuas ntxiv. Cov txheej uas muaj ob cov ntaub ntawv nano muaj kev tiv thaiv corrosion zoo dua.
Los ntawm Tafel nkhaus thiab qhov hloov pauv ntawm qhov hluav taws xob impedance tus nqi, nws pom tau tias alumina ceramic txheej nrog graphene, carbon nanotubes thiab lawv cov sib xyaw tuaj yeem txhim kho qhov corrosion tsis kam ntawm cov hlau matrix, thiab cov nyhuv synergistic ntawm ob tuaj yeem txhim kho qhov corrosion tsis kam ntawm cov nplaum ceramic txheej. Txhawm rau tshawb nrhiav ntxiv txog cov nyhuv ntawm nano additives ntawm corrosion tsis kam ntawm cov txheej, cov micro nto morphology ntawm cov txheej tom qab corrosion tau pom.
Xa
Daim Duab 5 (A1, A2, B1, B2) qhia txog qhov morphology ntawm qhov chaw ntawm 304 stainless hlau raug thiab coated alumina ceramics ntshiab ntawm qhov sib txawv magnification tom qab xeb. Daim Duab 5 (A2) qhia tau hais tias qhov chaw tom qab xeb dhau los ua ntxhib. Rau cov substrate liab qab, ntau qhov loj corrosion qhov tshwm sim ntawm qhov chaw tom qab immersion hauv electrolyte, qhia tias qhov corrosion tsis kam ntawm cov hlau matrix tsis zoo thiab electrolyte yooj yim nkag mus rau hauv matrix. Rau cov alumina ceramic txheej ntshiab, raws li pom hauv Daim Duab 5 (B2), txawm hais tias cov channel corrosion porous yog tsim tom qab xeb, cov qauv ntom ntom thiab corrosion zoo heev ntawm alumina ceramic txheej zoo thaiv kev nkag mus ntawm electrolyte, uas piav qhia txog qhov laj thawj rau kev txhim kho zoo ntawm impedance ntawm alumina ceramic txheej.
Xa
Cov qauv ntawm qhov chaw ntawm mwnt-cooh-sdbs, cov txheej uas muaj 0.2% graphene thiab cov txheej uas muaj 0.2% mwnt-cooh-sdbs thiab 0.2% graphene. Pom tau tias ob txheej uas muaj graphene hauv Daim Duab 6 (B2 thiab C2) muaj cov qauv tiaj tus, qhov sib txuas ntawm cov khoom me me hauv cov txheej yog nruj, thiab cov khoom sib sau ua ke raug qhwv nruj los ntawm cov nplaum. Txawm hais tias qhov chaw raug electrolyte eroded, tsawg dua cov qhov dej tau tsim. Tom qab xeb, qhov chaw txheej yog ntom thiab muaj ob peb qhov tsis zoo. Rau Daim Duab 6 (A1, A2), vim yog cov yam ntxwv ntawm mwnt-cooh-sdbs, cov txheej ua ntej xeb yog cov qauv porous faib sib npaug. Tom qab xeb, cov qhov dej ntawm qhov qub dhau los ua nqaim thiab ntev, thiab cov channel dhau los ua tob dua. Piv nrog Daim Duab 6 (B2, C2), cov qauv muaj ntau qhov tsis zoo, uas yog sib xws nrog qhov loj me ntawm cov txheej impedance tus nqi tau los ntawm kev sim electrochemical corrosion. Nws qhia tau hais tias cov txheej txheem alumina ceramic uas muaj graphene, tshwj xeeb tshaj yog cov sib xyaw ntawm graphene thiab carbon nanotube, muaj qhov zoo tshaj plaws tiv thaiv corrosion. Qhov no yog vim tias cov qauv ntawm carbon nanotube thiab graphene tuaj yeem thaiv qhov tawg diffusion thiab tiv thaiv lub matrix.
5. Kev sib tham thiab kev sau luv luv
Los ntawm kev sim tshuaj tiv thaiv corrosion ntawm cov pa roj carbon nanotubes thiab graphene additives ntawm alumina ceramic txheej thiab kev tshuaj xyuas ntawm qhov chaw microstructure ntawm cov txheej, cov lus xaus hauv qab no tau kos:
(1) Thaum lub sijhawm xeb yog 19 teev, ntxiv 0.2% hybrid carbon nanotube + 0.2% graphene sib xyaw cov khoom siv alumina ceramic txheej, qhov ceev tam sim no xeb nce ntxiv los ntawm 2.890 × 10-6 A / cm2 mus rau 1.536 × 10-6 A / cm2, qhov hluav taws xob impedance nce ntxiv los ntawm 11388 Ω mus rau 28079 Ω, thiab qhov ua haujlwm tiv thaiv corrosion yog qhov loj tshaj plaws, 46.85%. Piv nrog cov txheej txheem ceramic alumina ntshiab, cov txheej txheem sib xyaw nrog graphene thiab carbon nanotubes muaj kev tiv thaiv corrosion zoo dua.
(2) Nrog rau kev 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. Lub zog hluav taws xob impedance thawj zaug txo qis thiab tom qab ntawd nce, thiab qhov tsis kam corrosion ntawm cov txheej txheem alumina ceramic ntshiab yog pluag. Cov qauv thiab kev sib koom ua ke ntawm cov pa roj carbon nanotubes thiab graphene thaiv qhov nkag mus rau hauv qab ntawm electrolyte. Thaum ntub rau 19.5 teev, qhov hluav taws xob impedance ntawm cov txheej txheem uas muaj cov ntaub ntawv nano txo qis los ntawm 22.94%, 25.60% thiab 9.61% feem, thiab qhov tsis kam corrosion ntawm cov txheej txheem yog zoo.
6. Kev cuam tshuam ntawm kev tiv thaiv xeb txheej txheem
Los ntawm Tafel nkhaus thiab qhov hloov pauv ntawm qhov hluav taws xob impedance tus nqi, nws pom tau tias alumina ceramic txheej nrog graphene, carbon nanotubes thiab lawv cov sib xyaw tuaj yeem txhim kho qhov corrosion tsis kam ntawm cov hlau matrix, thiab cov nyhuv synergistic ntawm ob tuaj yeem txhim kho qhov corrosion tsis kam ntawm cov nplaum ceramic txheej. Txhawm rau tshawb nrhiav ntxiv txog cov nyhuv ntawm nano additives ntawm corrosion tsis kam ntawm cov txheej, cov micro nto morphology ntawm cov txheej tom qab corrosion tau pom.
Daim Duab 5 (A1, A2, B1, B2) qhia txog qhov morphology ntawm qhov chaw ntawm 304 stainless hlau raug thiab coated alumina ceramics ntshiab ntawm qhov sib txawv magnification tom qab xeb. Daim Duab 5 (A2) qhia tau hais tias qhov chaw tom qab xeb dhau los ua ntxhib. Rau cov substrate liab qab, ntau qhov loj corrosion qhov tshwm sim ntawm qhov chaw tom qab immersion hauv electrolyte, qhia tias qhov corrosion tsis kam ntawm cov hlau matrix tsis zoo thiab electrolyte yooj yim nkag mus rau hauv matrix. Rau cov alumina ceramic txheej ntshiab, raws li pom hauv Daim Duab 5 (B2), txawm hais tias cov channel corrosion porous yog tsim tom qab xeb, cov qauv ntom ntom thiab corrosion zoo heev ntawm alumina ceramic txheej zoo thaiv kev nkag mus ntawm electrolyte, uas piav qhia txog qhov laj thawj rau kev txhim kho zoo ntawm impedance ntawm alumina ceramic txheej.
Cov qauv ntawm qhov chaw ntawm mwnt-cooh-sdbs, cov txheej uas muaj 0.2% graphene thiab cov txheej uas muaj 0.2% mwnt-cooh-sdbs thiab 0.2% graphene. Pom tau tias ob txheej uas muaj graphene hauv Daim Duab 6 (B2 thiab C2) muaj cov qauv tiaj tus, qhov sib txuas ntawm cov khoom me me hauv cov txheej yog nruj, thiab cov khoom sib sau ua ke raug qhwv nruj los ntawm cov nplaum. Txawm hais tias qhov chaw raug electrolyte eroded, tsawg dua cov qhov dej tau tsim. Tom qab xeb, qhov chaw txheej yog ntom thiab muaj ob peb qhov tsis zoo. Rau Daim Duab 6 (A1, A2), vim yog cov yam ntxwv ntawm mwnt-cooh-sdbs, cov txheej ua ntej xeb yog cov qauv porous faib sib npaug. Tom qab xeb, cov qhov dej ntawm qhov qub dhau los ua nqaim thiab ntev, thiab cov channel dhau los ua tob dua. Piv nrog Daim Duab 6 (B2, C2), cov qauv muaj ntau qhov tsis zoo, uas yog sib xws nrog qhov loj me ntawm cov txheej impedance tus nqi tau los ntawm kev sim electrochemical corrosion. Nws qhia tau hais tias cov txheej txheem alumina ceramic uas muaj graphene, tshwj xeeb tshaj yog cov sib xyaw ntawm graphene thiab carbon nanotube, muaj qhov zoo tshaj plaws tiv thaiv corrosion. Qhov no yog vim tias cov qauv ntawm carbon nanotube thiab graphene tuaj yeem thaiv qhov tawg diffusion thiab tiv thaiv lub matrix.
7. Kev sib tham thiab kev sau luv luv
Los ntawm kev sim tshuaj tiv thaiv corrosion ntawm cov pa roj carbon nanotubes thiab graphene additives ntawm alumina ceramic txheej thiab kev tshuaj xyuas ntawm qhov chaw microstructure ntawm cov txheej, cov lus xaus hauv qab no tau kos:
(1) Thaum lub sijhawm xeb yog 19 teev, ntxiv 0.2% hybrid carbon nanotube + 0.2% graphene sib xyaw cov khoom siv alumina ceramic txheej, qhov ceev tam sim no xeb nce ntxiv los ntawm 2.890 × 10-6 A / cm2 mus rau 1.536 × 10-6 A / cm2, qhov hluav taws xob impedance nce ntxiv los ntawm 11388 Ω mus rau 28079 Ω, thiab qhov ua haujlwm tiv thaiv corrosion yog qhov loj tshaj plaws, 46.85%. Piv nrog cov txheej txheem ceramic alumina ntshiab, cov txheej txheem sib xyaw nrog graphene thiab carbon nanotubes muaj kev tiv thaiv corrosion zoo dua.
(2) Nrog rau kev 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. Lub zog hluav taws xob impedance thawj zaug txo qis thiab tom qab ntawd nce, thiab qhov tsis kam corrosion ntawm cov txheej txheem alumina ceramic ntshiab yog pluag. Cov qauv thiab kev sib koom ua ke ntawm cov pa roj carbon nanotubes thiab graphene thaiv qhov nkag mus rau hauv qab ntawm electrolyte. Thaum ntub rau 19.5 teev, qhov hluav taws xob impedance ntawm cov txheej txheem uas muaj cov ntaub ntawv nano txo qis los ntawm 22.94%, 25.60% thiab 9.61% feem, thiab qhov tsis kam corrosion ntawm cov txheej txheem yog zoo.
(3) Vim yog cov yam ntxwv ntawm cov pa roj carbon nanotubes, cov txheej ntxiv nrog cov pa roj carbon nanotubes ib leeg muaj cov qauv porous faib ua ntej xeb. Tom qab xeb, cov qhov hws ntawm qhov qub dhau los ua nqaim thiab ntev, thiab cov channel dhau los ua tob dua. Cov txheej uas muaj graphene muaj cov qauv tiaj tus ua ntej xeb, kev sib xyaw ua ke ntawm cov khoom me me hauv cov txheej yog ze, thiab cov khoom sib sau ua ke tau qhwv nruj nreem los ntawm cov nplaum. Txawm hais tias qhov chaw raug electrolyte eroded tom qab xeb, muaj ob peb qhov pore channels thiab cov qauv tseem ntom. Cov qauv ntawm cov pa roj carbon nanotubes thiab graphene tuaj yeem thaiv qhov tawg thiab tiv thaiv lub matrix.
Lub sijhawm tshaj tawm: Lub Peb Hlis-09-2022