1. Kukonzekera kupaka
Pofuna kuthandizira mayeso a electrochemical pambuyo pake, chitsulo chosapanga dzimbiri cha 30mm chimasankhidwa × 4 mm 304 ngati maziko. Pukutani ndi kuchotsa zotsalira za oxide ndi mawanga a dzimbiri pamwamba pa substrate ndi sandpaper, ziyikeni mu beaker yokhala ndi acetone, yeretsani madontho pamwamba pa substrate ndi bg-06c ultrasonic cleaner ya kampani yamagetsi ya Bangjie kwa mphindi 20, chotsani zinyalala zomwe zawonongeka pamwamba pa substrate yachitsulo ndi mowa ndi madzi osungunuka, ndikuziumitsa ndi blower. Kenako, alumina (Al2O3), graphene ndi hybrid carbon nanotube (mwnt-coohsdbs) zinakonzedwa molingana (100: 0: 0, 99.8: 0.2: 0, 99.8: 0: 0.2, 99.6: 0.2: 0.2), ndikuyika mu ball mill (qm-3sp2 ya Nanjing NANDA instrument factory) kuti mugaye ndi kusakaniza. Liwiro lozungulira la mphero ya mpira linayikidwa pa 220 R / min, ndipo mphero ya mpira inatembenuzidwa kukhala
Pambuyo pogaya mpira, ikani liwiro lozungulira la thanki yogaya mpira kukhala 1/2 mosinthana pambuyo pogaya mpira, ndipo ikani liwiro lozungulira la thanki yogaya mpira kukhala 1/2 mosinthana pambuyo pogaya mpira. Chophatikiza cha ceramic chogaya mpira ndi chomangira chimasakanizidwa mofanana malinga ndi gawo la 1.0 ∶ 0.8. Pomaliza, chophimba cha ceramic chomatira chinapezeka mwa njira yophikira.
2. Kuyesa dzimbiri
Mu kafukufukuyu, mayeso a electrochemical corrosion akugwiritsa ntchito malo ogwirira ntchito a Shanghai Chenhua chi660e electrochemical, ndipo mayesowo akugwiritsa ntchito njira yoyesera ma electrode atatu. Electrode ya platinamu ndi electrode yothandizira, electrode ya siliva ya chloride yasiliva ndi electrode yofotokozera, ndipo chitsanzo chophimbidwa ndi electrode yogwira ntchito, yokhala ndi malo owonekera bwino a 1cm2. Lumikizani electrode yofotokozera, electrode yogwira ntchito ndi electrode yothandiza mu selo ya electrolytic ndi chida, monga momwe zasonyezedwera pa Zithunzi 1 ndi 2. Musanayambe mayeso, lowetsani chitsanzocho mu electrolyte, yomwe ndi yankho la 3.5% NaCl.
3. Kusanthula kwa Tafel kwa kuwonongeka kwa zophimba zamagetsi
Chithunzi 3 chikuwonetsa kakhoma ka Tafel ka substrate yosaphimbidwa ndi ceramic yokutidwa ndi zowonjezera zosiyanasiyana za nano pambuyo pa electrochemical corrosion kwa maola 19. Voltage ya corrosion, corrosion current density ndi electrical impedance test deta yomwe yapezeka kuchokera ku electrochemical corrosion test ikuwonetsedwa mu Table 1.
Tumizani
Pamene kuchuluka kwa mphamvu ya dzimbiri kuli kochepa ndipo mphamvu ya kukana dzimbiri ili pamwamba, mphamvu ya kukana dzimbiri ya chophimbacho imakhala yabwino. Zitha kuwoneka kuchokera pa Chithunzi 3 ndi tebulo 1 kuti nthawi ya dzimbiri ikafika maola 19, mphamvu yayikulu ya mphamvu ya dzimbiri ya matrix yachitsulo chopanda kanthu ndi -0.680 V, ndipo kuchuluka kwa mphamvu ya dzimbiri ya matrix nayonso ndi yayikulu kwambiri, kufika pa 2.890 × 10-6 A/cm2 。 Ikapakidwa ndi chophimba cha alumina ceramic choyera, kuchuluka kwa mphamvu ya dzimbiri kunatsika kufika pa 78% ndipo PE inali 22.01%. Zimasonyeza kuti chophimba cha ceramic chimagwira ntchito yabwino yoteteza ndipo chingathandize kukana dzimbiri kwa chophimbacho mu electrolyte yopanda mbali.
Pamene 0.2% mwnt-cooh-sdbs kapena 0.2% graphene inawonjezeredwa ku pulasitiki, kuchuluka kwa corrosion current kunachepa, kukana kunawonjezeka, ndipo kukana kwa corrosion kwa pulasitiki kunawonjezeka, ndi PE ya 38.48% ndi 40.10% motsatana. Pamene pamwamba pake panakutidwa ndi 0.2% mwnt-cooh-sdbs ndi 0.2% graphene mixed alumina coating, corrosion current imachepetsedwa kuchoka pa 2.890 × 10-6 A / cm2 kufika pa 1.536 × 10-6 A / cm2, kukana kwakukulu, kunawonjezeka kuchoka pa 11388 Ω kufika pa 28079 Ω, ndipo PE ya pulasitiki ikhoza kufika pa 46.85%. Zimasonyeza kuti chinthu chokonzedwacho chili ndi kukana kwabwino kwa dzimbiri, ndipo mphamvu ya carbon nanotubes ndi graphene ingathandize bwino kukana kwa dzimbiri kwa ceramic coating.
4. Zotsatira za nthawi yothira madzi pa impedance yophimba
Pofuna kufufuza mozama za kukana dzimbiri kwa chophimbacho, poganizira momwe nthawi yovindikira ya chitsanzocho mu electrolyte imakhudzira mayesowo, ma curve osinthika a kukana kwa chophimbacho pa nthawi yosiyana yovindikira amapezeka, monga momwe zasonyezedwera pa Chithunzi 4.
Tumizani
Pa gawo loyamba la kumiza (maola 10), chifukwa cha kuchulukana bwino ndi kapangidwe kake, electrolyte imakhala yovuta kumiza mu pulasitiki. Panthawiyi, pulasitiki ya ceramic imawonetsa kukana kwakukulu. Pambuyo ponyowa kwa nthawi, kukana kumachepa kwambiri, chifukwa pakapita nthawi, electrolyte pang'onopang'ono imapanga njira yowononga kudzera m'mabowo ndi ming'alu ya pulasitiki ndikulowa mu matrix, zomwe zimapangitsa kuti kukana kwa pulasitiki kuchepe kwambiri.
Mu gawo lachiwiri, pamene zinthu zowononga zikukula kufika pamlingo winawake, kufalikira kumatsekedwa ndipo mpata umatsekedwa pang'onopang'ono. Nthawi yomweyo, pamene electrolyte imalowa mu mawonekedwe olumikizirana a bonding layer/matrix yolumikizirana, mamolekyu amadzi amachitapo kanthu ndi chinthu cha Fe mu matrix pamalo olumikizirana / matrix kuti apange filimu yopyapyala yachitsulo, yomwe imalepheretsa kulowa kwa electrolyte mu matrix ndikuwonjezera mphamvu yokana. Pamene matrix yachitsulo yopanda kanthu yatenthedwa ndi electrochemical, mvula yambiri yobiriwira imapangidwa pansi pa electrolyte. Yankho la electrolytic silinasinthe mtundu poyesa chitsanzo chophimbidwa ndi electrolyte, zomwe zingatsimikizire kukhalapo kwa mankhwala omwe ali pamwambapa.
Chifukwa cha nthawi yochepa yonyowa komanso zinthu zazikulu zomwe zimakhudzidwa ndi zinthu zakunja, kuti tipeze ubale wolondola wa kusintha kwa magawo amagetsi, ma curve a Tafel a maola 19 ndi 19.5 amawunikidwa. Kuchuluka kwa mphamvu ya dzimbiri ndi kukana komwe kumapezeka ndi pulogalamu yowunikira ya zsimpwin kwawonetsedwa mu Gome 2. Zitha kupezeka kuti zikanyowa kwa maola 19, poyerekeza ndi substrate yopanda kanthu, kuchuluka kwa mphamvu ya dzimbiri kwa alumina yoyera ndi alumina yokhala ndi zinthu zowonjezera za nano ndi kochepa ndipo mtengo wotsutsa ndi waukulu. Kulimba kwa mphamvu ya ceramic yokhala ndi ma nanotubes a kaboni ndi zokutira zokhala ndi graphene ndi kofanana, pomwe kapangidwe ka zokutira ndi ma nanotubes a kaboni ndi zinthu zopangidwa ndi graphene kumawonjezeka kwambiri, Izi zili choncho chifukwa mphamvu ya synergistic ya ma nanotubes a kaboni amodzi ndi ma graphene awiri-dimensional imakulitsa kukana kwa dzimbiri kwa zinthuzo.
Pamene nthawi yothira madzi ikuwonjezeka (maola 19.5), kukana kwa substrate yopanda kanthu kumawonjezeka, zomwe zikusonyeza kuti ili mu gawo lachiwiri la dzimbiri ndipo filimu ya oxide yachitsulo imapangidwa pamwamba pa substrate. Mofananamo, pamene nthawi ikuwonjezeka, kukana kwa ceramic coating yoyera ya alumina kumawonjezekanso, zomwe zikusonyeza kuti panthawiyi, ngakhale kuti pali kuchepa kwa ceramic coating, electrolyte yalowa mu bonding interface ya coating / matrix, ndipo yapanga oxide film kudzera mu chemical reaction.
Poyerekeza ndi chophimba cha alumina chokhala ndi 0.2% mwnt-cooh-sdbs, chophimba cha alumina chokhala ndi 0.2% graphene ndi chophimba cha alumina chokhala ndi 0.2% mwnt-cooh-sdbs ndi 0.2% graphene, kukana kwa chophimba kunachepa kwambiri ndi kuwonjezeka kwa nthawi, kunachepa ndi 22.94%, 25.60% ndi 9.61% motsatana, zomwe zikusonyeza kuti electrolyte sinalowe mu cholumikizira pakati pa chophimba ndi substrate panthawiyi. Izi zili choncho chifukwa kapangidwe ka ma nanotubes a carbon ndi graphene kamatseka kulowa kwa electrolyte pansi, motero kuteteza matrix. Mphamvu ya mgwirizano wa ziwirizi yatsimikiziridwanso. Chophimba chokhala ndi zinthu ziwiri za nano chili ndi kukana bwino dzimbiri.
Kudzera mu Tafel curve ndi kusintha kwa mphamvu yamagetsi yoteteza, zapezeka kuti alumina ceramic coverage yokhala ndi graphene, carbon nanotubes ndi kusakaniza kwawo kumatha kupititsa patsogolo kukana kwa dzimbiri kwa matrix yachitsulo, ndipo mphamvu ya mgwirizano wa ziwirizi ikhoza kupititsa patsogolo kukana kwa dzimbiri kwa chophimba cha ceramic chomatira. Pofuna kufufuza mozama momwe zowonjezera za nano zimakhudzira kukana kwa dzimbiri kwa chophimbacho, mawonekedwe a micro surface a chophimbacho pambuyo pa dzimbiri adawonedwa.
Tumizani
Chithunzi 5 (A1, A2, B1, B2) chikuwonetsa mawonekedwe a pamwamba pa zitsulo zosapanga dzimbiri 304 zowonekera ndi zoyera za alumina zophimbidwa pakukula kosiyanasiyana pambuyo pa dzimbiri. Chithunzi 5 (A2) chikuwonetsa kuti pamwamba pambuyo pa dzimbiri zimakhala zowuma. Pa gawo lopanda kanthu, mabowo akuluakulu angapo a dzimbiri amawonekera pamwamba pambuyo pomizidwa mu electrolyte, zomwe zikusonyeza kuti kukana kwa dzimbiri kwa matrix yachitsulo chopanda kanthu ndi koipa ndipo electrolyte ndi yosavuta kulowa mu matrix. Pa zokutira za alumina ceramic zoyera, monga momwe zasonyezedwera pa Chithunzi 5 (B2), ngakhale njira zotupa zopangidwa ndi maporous zimapangidwa pambuyo pa dzimbiri, kapangidwe kolimba komanso kukana kwa dzimbiri kwa zokutira za alumina ceramic zoyera bwino kumaletsa kulowa kwa electrolyte, zomwe zimafotokoza chifukwa chake kusintha kwamphamvu kwa impedance ya zokutira za alumina ceramic kumawongolera bwino.
Tumizani
Kapangidwe ka pamwamba pa mwnt-cooh-sdbs, zokutira zokhala ndi 0.2% graphene ndi zokutira zokhala ndi 0.2% mwnt-cooh-sdbs ndi 0.2% graphene. Zikuoneka kuti zokutira ziwiri zokhala ndi graphene zomwe zili mu Chithunzi 6 (B2 ndi C2) zili ndi kapangidwe kathyathyathya, kulumikizana pakati pa tinthu tating'onoting'ono mu zokutira kumakhala kolimba, ndipo tinthu tating'onoting'ono tomwe timakulungidwa bwino ndi guluu. Ngakhale kuti pamwamba pake pasungunuka ndi electrolyte, njira zochepa za pore zimapangidwa. Pambuyo pa dzimbiri, pamwamba pake pamakhala wokhuthala ndipo pali mapangidwe ochepa a zolakwika. Pa Chithunzi 6 (A1, A2), chifukwa cha makhalidwe a mwnt-cooh-sdbs, zokutira zisanachitike dzimbiri zimakhala ndi pore yogawidwa mofanana. Pambuyo pa dzimbiri, ma pores a gawo loyambirira amakhala ochepa komanso ataliatali, ndipo njirayo imakhala yozama. Poyerekeza ndi Chithunzi 6 (B2, C2), kapangidwe kake kali ndi zolakwika zambiri, zomwe zimagwirizana ndi kugawa kwa kukula kwa mtengo wa impedance wokutira womwe umapezeka kuchokera ku mayeso a dzimbiri a electrochemical. Zimasonyeza kuti chophimba cha alumina ceramic chokhala ndi graphene, makamaka chisakanizo cha graphene ndi carbon nanotube, chili ndi mphamvu yabwino kwambiri yolimbana ndi dzimbiri. Izi zili choncho chifukwa kapangidwe ka carbon nanotube ndi graphene kamatha kuletsa kufalikira kwa ming'alu ndikuteteza matrix.
5. Kukambirana ndi chidule
Kudzera mu mayeso olimbana ndi dzimbiri a ma nanotubes a kaboni ndi zowonjezera za graphene pa zokutira za alumina ceramic ndi kusanthula kwa kapangidwe ka pamwamba pa zokutira, mfundo zotsatirazi zaperekedwa:
(1) Pamene nthawi ya dzimbiri inali maola 19, kuwonjezera 0.2% hybrid carbon nanotube + 0.2% graphene mixed material alumina ceramic coating, corrosion current density inakwera kuchoka pa 2.890 × 10-6 A / cm2 kufika pa 1.536 × 10-6 A / cm2, electrical impedance inakwera kuchoka pa 11388 Ω kufika pa 28079 Ω, ndipo mphamvu ya dzimbiri inali yaikulu kwambiri, 46.85%. Poyerekeza ndi ceramic coating ya alumina yoyera, graphene ndi carbon nanotubes zimakhala ndi kukana kwabwino kwa dzimbiri.
(2) Pamene nthawi yothira ya electrolyte ikuwonjezeka, electrolyte imalowa pamwamba pa chophimba/substrate kuti ipange filimu yachitsulo ya oxide, yomwe imalepheretsa kulowa kwa electrolyte mu substrate. Kukaniza kwamagetsi koyamba kumachepa kenako kumawonjezeka, ndipo kukana dzimbiri kwa chophimba choyera cha alumina ceramic kumakhala koipa. Kapangidwe ndi mgwirizano wa ma carbon nanotubes ndi graphene zinatseka kulowa kwa electrolyte pansi. Ikanyowa kwa maola 19.5, kukaniza kwamagetsi kwa chophimba chokhala ndi zinthu za nano kunachepa ndi 22.94%, 25.60% ndi 9.61% motsatana, ndipo kukana kwa dzimbiri kwa chophimbacho kunali kwabwino.
6. Mphamvu ya kukana dzimbiri pophimba
Kudzera mu Tafel curve ndi kusintha kwa mphamvu yamagetsi yoteteza, zapezeka kuti alumina ceramic coverage yokhala ndi graphene, carbon nanotubes ndi kusakaniza kwawo kumatha kupititsa patsogolo kukana kwa dzimbiri kwa matrix yachitsulo, ndipo mphamvu ya mgwirizano wa ziwirizi ikhoza kupititsa patsogolo kukana kwa dzimbiri kwa chophimba cha ceramic chomatira. Pofuna kufufuza mozama momwe zowonjezera za nano zimakhudzira kukana kwa dzimbiri kwa chophimbacho, mawonekedwe a micro surface a chophimbacho pambuyo pa dzimbiri adawonedwa.
Chithunzi 5 (A1, A2, B1, B2) chikuwonetsa mawonekedwe a pamwamba pa zitsulo zosapanga dzimbiri 304 zowonekera ndi zoyera za alumina zophimbidwa pakukula kosiyanasiyana pambuyo pa dzimbiri. Chithunzi 5 (A2) chikuwonetsa kuti pamwamba pambuyo pa dzimbiri zimakhala zowuma. Pa gawo lopanda kanthu, mabowo akuluakulu angapo a dzimbiri amawonekera pamwamba pambuyo pomizidwa mu electrolyte, zomwe zikusonyeza kuti kukana kwa dzimbiri kwa matrix yachitsulo chopanda kanthu ndi koipa ndipo electrolyte ndi yosavuta kulowa mu matrix. Pa zokutira za alumina ceramic zoyera, monga momwe zasonyezedwera pa Chithunzi 5 (B2), ngakhale njira zotupa zopangidwa ndi maporous zimapangidwa pambuyo pa dzimbiri, kapangidwe kolimba komanso kukana kwa dzimbiri kwa zokutira za alumina ceramic zoyera bwino kumaletsa kulowa kwa electrolyte, zomwe zimafotokoza chifukwa chake kusintha kwamphamvu kwa impedance ya zokutira za alumina ceramic kumawongolera bwino.
Kapangidwe ka pamwamba pa mwnt-cooh-sdbs, zokutira zokhala ndi 0.2% graphene ndi zokutira zokhala ndi 0.2% mwnt-cooh-sdbs ndi 0.2% graphene. Zikuoneka kuti zokutira ziwiri zokhala ndi graphene zomwe zili mu Chithunzi 6 (B2 ndi C2) zili ndi kapangidwe kathyathyathya, kulumikizana pakati pa tinthu tating'onoting'ono mu zokutira kumakhala kolimba, ndipo tinthu tating'onoting'ono tomwe timakulungidwa bwino ndi guluu. Ngakhale kuti pamwamba pake pasungunuka ndi electrolyte, njira zochepa za pore zimapangidwa. Pambuyo pa dzimbiri, pamwamba pake pamakhala wokhuthala ndipo pali mapangidwe ochepa a zolakwika. Pa Chithunzi 6 (A1, A2), chifukwa cha makhalidwe a mwnt-cooh-sdbs, zokutira zisanachitike dzimbiri zimakhala ndi pore yogawidwa mofanana. Pambuyo pa dzimbiri, ma pores a gawo loyambirira amakhala ochepa komanso ataliatali, ndipo njirayo imakhala yozama. Poyerekeza ndi Chithunzi 6 (B2, C2), kapangidwe kake kali ndi zolakwika zambiri, zomwe zimagwirizana ndi kugawa kwa kukula kwa mtengo wa impedance wokutira womwe umapezeka kuchokera ku mayeso a dzimbiri a electrochemical. Zimasonyeza kuti chophimba cha alumina ceramic chokhala ndi graphene, makamaka chisakanizo cha graphene ndi carbon nanotube, chili ndi mphamvu yabwino kwambiri yolimbana ndi dzimbiri. Izi zili choncho chifukwa kapangidwe ka carbon nanotube ndi graphene kamatha kuletsa kufalikira kwa ming'alu ndikuteteza matrix.
7. Kukambirana ndi chidule
Kudzera mu mayeso olimbana ndi dzimbiri a ma nanotubes a kaboni ndi zowonjezera za graphene pa zokutira za alumina ceramic ndi kusanthula kwa kapangidwe ka pamwamba pa zokutira, mfundo zotsatirazi zaperekedwa:
(1) Pamene nthawi ya dzimbiri inali maola 19, kuwonjezera 0.2% hybrid carbon nanotube + 0.2% graphene mixed material alumina ceramic coating, corrosion current density inakwera kuchoka pa 2.890 × 10-6 A / cm2 kufika pa 1.536 × 10-6 A / cm2, electrical impedance inakwera kuchoka pa 11388 Ω kufika pa 28079 Ω, ndipo mphamvu ya dzimbiri inali yaikulu kwambiri, 46.85%. Poyerekeza ndi ceramic coating ya alumina yoyera, graphene ndi carbon nanotubes zimakhala ndi kukana kwabwino kwa dzimbiri.
(2) Pamene nthawi yothira ya electrolyte ikuwonjezeka, electrolyte imalowa pamwamba pa chophimba/substrate kuti ipange filimu yachitsulo ya oxide, yomwe imalepheretsa kulowa kwa electrolyte mu substrate. Kukaniza kwamagetsi koyamba kumachepa kenako kumawonjezeka, ndipo kukana dzimbiri kwa chophimba choyera cha alumina ceramic kumakhala koipa. Kapangidwe ndi mgwirizano wa ma carbon nanotubes ndi graphene zinatseka kulowa kwa electrolyte pansi. Ikanyowa kwa maola 19.5, kukaniza kwamagetsi kwa chophimba chokhala ndi zinthu za nano kunachepa ndi 22.94%, 25.60% ndi 9.61% motsatana, ndipo kukana kwa dzimbiri kwa chophimbacho kunali kwabwino.
(3) Chifukwa cha makhalidwe a ma carbon nanotubes, chophimba chomwe chimawonjezeredwa ndi ma carbon nanotubes okha chimakhala ndi kapangidwe kogawanika bwino kasanawonongeke. Pambuyo pa dzimbiri, ma pores a gawo loyambirira amakhala ochepa komanso aatali, ndipo njira zimakhala zozama. Chophimba chokhala ndi graphene chimakhala ndi kapangidwe kosalala kasanawonongeke, kuphatikiza pakati pa tinthu tating'onoting'ono mu chophimbacho kumakhala koyandikana, ndipo tinthu tating'onoting'ono tomwe timakulungidwa mwamphamvu ndi guluu. Ngakhale kuti pamwamba pake pasungunuka ndi electrolyte pambuyo pa dzimbiri, pali njira zochepa za ma pores ndipo kapangidwe kake kakadali kokhuthala. Kapangidwe ka ma carbon nanotubes ndi graphene kangathe kuletsa bwino kufalikira kwa ming'alu ndikuteteza matrix.
Nthawi yotumizira: Marichi-09-2022