1. Ukulungiselela ukugqoka
Ukuze kube lula ukuhlolwa kwe-electrochemical yakamuva, i-30mm ikhethwa × 4 mm 304 insimbi engagqwali njengesisekelo. Pholisha bese ususa ungqimba lwe-oxide osele kanye namabala okugqwala phezu kwe-substrate nge-sandpaper, uwafake ebhekheni eliqukethe i-acetone, uphathe amabala angaphezulu kwe-substrate nge-bg-06c ultrasonic cleaner yenkampani ye-Bangjie electronics imizuzu engu-20, susa imfucumfucu egugile ebusweni bensimbi egayiwe nge-substrate nge-substilled ngamanzi, utshwala futhi womile. Khona-ke, i-alumina (Al2O3), i-graphene ne-hybrid carbon nanotube (mwnt-coohsdbs) yalungiswa ngokulingana (100: 0: 0, 99.8: 0.2: 0, 99.8: 0: 0.2, 99.6: 0.2: 0.2), futhi yafakwa ku-Nanji mispANDA yensimbi yefekthri ye-Njiq-mispANDA (insimbi ye-Nanji) ukugaya ibhola nokuxuba. Ijubane elijikelezayo le-ball mill lalibekwe ku-220 R / min, futhi isigayo sebhola saphendulwa.
Ngemva kokugaya ibhola, setha isivinini sokuzungezisa sethangi lokugaya ibhola libe ngu-1/2 ngokushintshana ngemva kokuba ukugaya ibhola sekuqediwe, bese usetha ijubane lokuzungezisa lethangi lokugaya ibhola libe ngu-1/2 ngokushintshana ngemva kokuqedwa kokugaya ibhola. I-ceramic aggregate yebhola egayiwe kanye ne-binder ixutshwe ngokulinganayo ngokuya ngengxenye enkulu engu-1.0 ∶ 0.8. Ekugcineni, i-adhesive ceramic coating yatholwa ngenqubo yokwelapha.
2. Ukuhlolwa kokugqwala
Kulolu cwaningo, ukuhlolwa kokugqwala kwe-electrochemical kusebenzisa indawo yokusebenzela ye-electrochemical ye-Shanghai Chenhua chi660e, futhi ukuhlolwa kusebenzisa uhlelo lokuhlola ama-electrode amathathu. I-electrode yeplatinamu iyi-electrode eyisiza, i-silver chloride electrode iyi-electrode eyireferensi, futhi isampula emboziwe iwugesi osebenzayo, onendawo yokuchayeka esebenzayo engu-1cm2. Xhuma i-electrode eyireferensi, i-electrode esebenzayo kanye ne-electrode eyisiza kuseli ye-electrolytic ngethuluzi, njengoba kuboniswe kuMfanekiso 1 no-2. Ngaphambi kokuhlolwa, cwilisa isampula ku-electrolyte, okuyisisombululo se-NaCl esingu-3.5%.
3. Ukuhlaziywa kwe-Tafel ye-electrochemical corrosion of coatings
Umdwebo 3 ubonisa ijika le-Tafel le-substrate engagcotshiwe kanye ne-ceramic coating ehlanganiswe nezithasiselo ze-nano ezihlukile ngemva kokugqwala kwe-electrochemical 19h. I-corrosion voltage, ukugqwala kwamanje kokugqwala kanye nedatha yokuhlola i-impedance kagesi etholwe ekuhlolweni kokugqwala kwe-electrochemical kuboniswa kuThebula 1.
Thumela
Lapho ukugqwala kwamanje kukuncane futhi ukumelana nokugqwala kuphakeme, umphumela wokumelana nokugqwala ungcono. Kungabonakala kuMfanekiso 3 kanye nethebula 1 ukuthi uma isikhathi sokugqwala singu-19h, i-voltage ephezulu yokugqwala ye-matrix yensimbi engenalutho ingu-0.680 V, kanti ukugqwala kwamanje kwe-matrix kukhulu kakhulu, kufinyelela ku-2.890 × 10-6 A/cm2. I-PE yayingu-22.01%. Kubonisa ukuthi i-ceramic coating idlala indima engcono yokuvikela futhi ingathuthukisa ukumelana nokugqwala kwentonga ku-electrolyte engathathi hlangothi.
Lapho i-0.2% mwnt-cooh-sdbs noma i-graphene engu-0.2% yengezwe embotsheni, ukugqwala kwamanje kwehla, ukumelana kwanda, futhi ukumelana nokugqwala kwe-corrosion kwathuthukiswa nakakhulu, nge-PE ka-38.48% no-40.10% ngokulandelanayo. Lapho ingaphezulu limbozwe nge-0.2% mwnt-cooh-sdbs kanye no-0.2% we-graphene exutshwe i-alumina ehlanganisiwe, ukugqwala kwamanje kuncishiswa ukusuka ku-2.890 × 10-6 A / cm2 kwehle kuye ku-1.536 × 10-6 A / cm2, inani eliphakeme lokumelana, lenyuke lisuka ku-000 laya ku-7 Ω laya ku-8 Ω lafika ku-8 Ω Ω 8, Ω 8, Ω 8, Ω 8, Ω 8 Ω, 8 Ω Ω 8 Ω 8 Ω. ukunamathela kungafinyelela ku-46.85%. Kubonisa ukuthi umkhiqizo ohlosiwe olungiselelwe unokumelana nokugqwala okuhle, futhi umphumela we-synergistic we-carbon nanotubes ne-graphene ungathuthukisa ngempumelelo ukumelana nokugqwala kwe-ceramic coating.
4. Umthelela wesikhathi sokucwiliswa ku-coating impedance
Ukuze kuqhutshekwe nokuhlola ukumelana nokugqwala kwengubo, kucatshangelwa ithonya lesikhathi sokucwiliswa kwesampula ku-electrolyte ekuhlolweni, amajika okushintsha ukumelana kwezingubo ezine ngesikhathi sokucwiliswa okuhlukile ayatholakala, njengoba kuboniswe kuMfanekiso 4.
Thumela
Esigabeni sokuqala sokucwiliswa (amahora angu-10), ngenxa yobuningi obuhle kanye nesakhiwo sokumboza, i-electrolyte inzima ukucwiliswa ekugqokeni. Ngalesi sikhathi, i-ceramic coating ibonisa ukumelana okuphezulu. Ngemuva kokucwiliswa isikhathi eside, ukumelana kuncipha kakhulu, ngoba ngokuhamba kwesikhathi, i-electrolyte kancane kancane yakha umzila wokugqwala ngokusebenzisa ama-pores kanye nokuqhekeka kwe-coating futhi ingena ku-matrix, okuholela ekwehleni okuphawulekayo kokumelana nokugqoka.
Esigabeni sesibili, lapho imikhiqizo yokugqwala ikhuphuka ibe yinani elithile, ukusabalalisa kuvinjelwe futhi igebe livinjelwa kancane kancane. Ngesikhathi esifanayo, lapho i-electrolyte ingena kusixhumi esibonakalayo esibophezelayo sesendlalelo esingaphansi / i-matrix, ama-molecule amanzi azosabela nge-elementi ye-Fe ku-matrix lapho kuhlangana khona i-coating / matrix ukuze kukhiqizwe ifilimu encane yensimbi ye-oxide, evimbela ukungena kwe-electrolyte ku-matrix futhi ikhulise inani lokumelana. Lapho i-matrix yensimbi engenalutho i-electrochemically corroded, iningi lemvula eluhlaza okotshani ikhiqizwa phansi kwe-electrolyte. Isixazululo se-electrolytic asizange sishintshe umbala lapho kufakwa i-electrolyzing isampula enamathiselwe, okungafakazela ukuba khona kokusabela kwamakhemikhali okungenhla.
Ngenxa yesikhathi esifushane sokucwiliswa emanzini kanye nezici ezinkulu zethonya zangaphandle, ukuze kuqhutshekwe kutholakale ubudlelwano obunembile boshintsho lwemingcele ye-electrochemical, amajika e-Tafel angu-19 h no-19.5 h ayahlaziywa. Ubuningi bamanje bokugqwala nokumelana okutholwe isofthiwe yokuhlaziya i-zsimpwin kuboniswa kuThebula 2. Kungatholakala ukuthi uma kucwiliswe amahora angu-19, uma kuqhathaniswa ne-substrate engenalutho, ukugqwala kwamanje kokugqwala kwe-alumina ehlanzekile kanye ne-alumina eyinhlanganisela equkethe izinto ezingeziwe ze-nano zincane futhi inani lokumelana likhulu. Inani lokumelana le-ceramic coating equkethe i-carbon nanotubes kanye ne-graphene equkethe i-graphene icishe ifane, kuyilapho isakhiwo sokumboza esinama-carbon nanotubes nezinto ezihlanganisiwe ze-graphene sithuthukiswa kakhulu, Lokhu kungenxa yokuthi umphumela we-synergistic we-carbon nanotubes enohlangothi olulodwa kanye ne-graphene enezinhlangothi ezimbili kuthuthukisa ukumelana nokugqwala kwezinto.
Ngokukhula kwesikhathi sokucwiliswa (19.5 h), ukumelana kwe-substrate engenalutho kuyanda, okubonisa ukuthi kusesigabeni sesibili sokugqwala kanye nefilimu ye-oxide yensimbi ikhiqizwa ebusweni be-substrate. Ngokufanayo, ngokukhula kwesikhathi, ukumelana kwe-alumina ehlanzekile ye-ceramic coating nakho kuyanda, okubonisa ukuthi ngalesi sikhathi, nakuba kunomphumela ophuzayo we-ceramic enamathela, i-electrolyte ingene ku-interface yokubopha ye-coating / matrix, futhi yakhiqiza ifilimu ye-oxide ngokusebenzisa ukusabela kwamakhemikhali.
Uma kuqhathaniswa nesimbozo se-alumina esiqukethe u-0.2% we-mwnt-cooh-sdbs, i-alumina equkethe u-0.2% we-graphene kanye ne-alumina equkethe u-0.2% we-mwnt-cooh-sdbs kanye no-0.2% we-graphene, ukumelana nokwemboza kwehle kakhulu ngokukhula kwesikhathi, kwehle ngo-22.94%, 60% kanye nenhlonipho ngo-22.94% ukuthi i-electrolyte ayizange ingene ekuhlanganyeleni phakathi kwe-coating ne-substrate ngalesi sikhathi, Lokhu kungenxa yokuthi ukwakheka kwe-carbon nanotubes ne-graphene kuvimbela ukungena phansi kwe-electrolyte, ngaleyo ndlela ivikele i-matrix. Umphumela we-synergistic wakho kokubili uqinisekiswa futhi. I-coating equkethe izinto ezimbili ze-nano inokumelana nokugqwala okungcono.
Ngokusebenzisa ijika le-Tafel kanye nejika elishintshayo lenani le-impedance kagesi, kutholakala ukuthi i-alumina ceramic coating ene-graphene, i-carbon nanotubes nengxube yayo ingathuthukisa ukumelana nokugqwala kwe-matrix yensimbi, futhi umphumela we-synergistic walokhu okubili ungathuthukisa ukumelana nokugqwala kwe-adhesive ceramic coating. Ukuze kuqhutshekwe nokuhlola umthelela wezithasiselo ze-nano ekuphikiseni ukugqwala kwe-coating, i-micro surface morphology ye-coating ngemva kokugqwala yabonwa.
Thumela
Umfanekiso 5 (A1, A2, B1, B2) ubonisa ukuma komhlaba kwensimbi engagqwali engu-304 eveziwe kanye nezinsimbi zobumba ezihlanzekile ze-alumina ekukhulisweni okuhlukile ngemva kokugqwala. Umfanekiso wesi-5 (A2) ubonisa ukuthi ingaphezulu ngemva kokugqwala liba lukhuni. Ku-substrate engenalutho, imigodi eminingana emikhulu yokugqwala ivela phezulu ngemva kokucwiliswa ku-electrolyte, okubonisa ukuthi ukumelana nokugqwala kwe-matrix yensimbi engenalutho kubi futhi i-electrolyte kulula ukungena ku-matrix. Ukuze uthole i-alumina Ceramic ehlanzekile, njengoba kukhonjisiwe kuMfanekiso 5 (B2), nakuba iziteshi zokugqwala ezinezimbotshana zenziwa ngemva kokugqwala, isakhiwo esiminyene kakhulu kanye nokumelana nokugqwala okuhle kakhulu kwe-alumina ceramic enamathelayo kuvimbela ngempumelelo ukuhlasela kwe-electrolyte, echaza isizathu sokuthuthukiswa okuphumelelayo kwe-impedance ye-alumina ceramic coating.
Thumela
I-Surface morphology ye-mwnt-cooh-sdbs, ama-coatings aqukethe u-0.2% we-graphene nama-coatings aqukethe u-0.2% we-mwnt-cooh-sdbs kanye no-0.2% wegraphene. Kungabonakala ukuthi izigqoko ezimbili eziqukethe i-graphene ku-Figure 6 (B2 no-C2) zinesakhiwo esiyisicaba, ukubopha phakathi kwezinhlayiya ekugqokeni kuqinile, futhi izinhlayiya ezihlanganisiwe ziboshwe ngokuqinile ngokunamathela. Nakuba indawo engaphezulu iguguleka yi-electrolyte, kwakheka imigudu encane ye-pore. Ngemuva kokugqwala, indawo enamathelayo iminyene futhi kunezakhiwo ezimbalwa ezinesici. Ngomfanekiso 6 (A1, A2), ngenxa yezici ze-mwnt-cooh-sdbs, ukumboza ngaphambi kokugqwala kuyisakhiwo esinezimbotshana esatshalaliswe ngokulinganayo. Ngemva kokugqwala, izimbotshana zengxenye yokuqala ziba mincane futhi zinde, futhi isiteshi siyajula. Uma kuqhathaniswa nomfanekiso wesi-6 (B2, C2), isakhiwo sinokukhubazeka okwengeziwe, okuhambisana nokusatshalaliswa kosayizi wenani le-impedance yokunamathela etholwe ekuhlolweni kokugqwala kwe-electrochemical. Kubonisa ukuthi i-alumina ceramic coating equkethe i-graphene, ikakhulukazi ingxube ye-graphene ne-carbon nanotube, inokumelana nokugqwala okungcono kakhulu. Lokhu kungenxa yokuthi ukwakheka kwe-carbon nanotube ne-graphene kungavimba ngempumelelo ukusakazeka kokuqhekeka futhi kuvikele i-matrix.
5. Ingxoxo nesifinyezo
Ngokuhlolwa kokumelana nokugqwala kwe-carbon nanotubes kanye nezithasiselo ze-graphene ku-alumina ceramic enamathela kanye nokuhlaziywa kwe-microstructure engaphezulu ye-coating, kufinyelelwa iziphetho ezilandelayo:
(1) Lapho isikhathi sokugqwala singu-19 h, wengeza u-0.2% we-hybrid carbon nanotube + 0.2% we-graphene exutshwe impahla ye-alumina ceramic enamathela, ukugqwala kwamanje kukhuphuke kusuka ku-2.890 × 10-6 A / cm2 kwehle kuya ku-1.536 × 10-6 A / 1 cm2, kukhuphuka kagesi kusuka ku-8 A / 1 cm2 28079 Ω, kanye nokusebenza kahle kokumelana nokugqwala kukhulu, 46.85%. Uma kuqhathaniswa nocwecwe lwe-alumina ceramic ehlanzekile, ukuhlanganiswa kwe-graphene kanye ne-carbon nanotubes kunokumelana nokugqwala okungcono.
(2) Ngokukhula kwesikhathi sokucwiliswa kwe-electrolyte, i-electrolyte ingena endaweni ehlangene yokwemboza / i-substrate ukuze ikhiqize ifilimu yensimbi ye-oxide, evimbela ukungena kwe-electrolyte ku-substrate. I-impedance kagesi iqala yehla bese ikhuphuka, futhi ukumelana nokugqwala kwe-alumina ehlanzekile ye-ceramic coating kubi. Ukwakheka nokuhlangana kwe-carbon nanotubes ne-graphene kuvimbe ukungena phansi kwe-electrolyte. Lapho kucwiliswe i-19.5 h, i-impedance kagesi ye-coating equkethe izinto ze-nano yehle ngo-22.94%, 25.60% no-9.61% ngokulandelana, futhi ukumelana nokugqwala kwe-coating kwakukuhle.
6. Ithonya indlela yokumelana nokugqwala enamathela
Ngokusebenzisa ijika le-Tafel kanye nejika elishintshayo lenani le-impedance kagesi, kutholakala ukuthi i-alumina ceramic coating ene-graphene, i-carbon nanotubes nengxube yayo ingathuthukisa ukumelana nokugqwala kwe-matrix yensimbi, futhi umphumela we-synergistic walokhu okubili ungathuthukisa ukumelana nokugqwala kwe-adhesive ceramic coating. Ukuze kuqhutshekwe nokuhlola umthelela wezithasiselo ze-nano ekuphikiseni ukugqwala kwe-coating, i-micro surface morphology ye-coating ngemva kokugqwala yabonwa.
Umfanekiso 5 (A1, A2, B1, B2) ubonisa ukuma komhlaba kwensimbi engagqwali engu-304 eveziwe kanye nezinsimbi zobumba ezihlanzekile ze-alumina ekukhulisweni okuhlukile ngemva kokugqwala. Umfanekiso wesi-5 (A2) ubonisa ukuthi ingaphezulu ngemva kokugqwala liba lukhuni. Ku-substrate engenalutho, imigodi eminingana emikhulu yokugqwala ivela phezulu ngemva kokucwiliswa ku-electrolyte, okubonisa ukuthi ukumelana nokugqwala kwe-matrix yensimbi engenalutho kubi futhi i-electrolyte kulula ukungena ku-matrix. Ukuze uthole i-alumina Ceramic ehlanzekile, njengoba kukhonjisiwe kuMfanekiso 5 (B2), nakuba iziteshi zokugqwala ezinezimbotshana zenziwa ngemva kokugqwala, isakhiwo esiminyene kakhulu kanye nokumelana nokugqwala okuhle kakhulu kwe-alumina ceramic enamathelayo kuvimbela ngempumelelo ukuhlasela kwe-electrolyte, echaza isizathu sokuthuthukiswa okuphumelelayo kwe-impedance ye-alumina ceramic coating.
I-Surface morphology ye-mwnt-cooh-sdbs, ama-coatings aqukethe u-0.2% we-graphene nama-coatings aqukethe u-0.2% we-mwnt-cooh-sdbs kanye no-0.2% wegraphene. Kungabonakala ukuthi izigqoko ezimbili eziqukethe i-graphene ku-Figure 6 (B2 no-C2) zinesakhiwo esiyisicaba, ukubopha phakathi kwezinhlayiya ekugqokeni kuqinile, futhi izinhlayiya ezihlanganisiwe ziboshwe ngokuqinile ngokunamathela. Nakuba indawo engaphezulu iguguleka yi-electrolyte, kwakheka imigudu encane ye-pore. Ngemuva kokugqwala, indawo enamathelayo iminyene futhi kunezakhiwo ezimbalwa ezinesici. Ngomfanekiso 6 (A1, A2), ngenxa yezici ze-mwnt-cooh-sdbs, ukumboza ngaphambi kokugqwala kuyisakhiwo esinezimbotshana esatshalaliswe ngokulinganayo. Ngemva kokugqwala, izimbotshana zengxenye yokuqala ziba mincane futhi zinde, futhi isiteshi siyajula. Uma kuqhathaniswa nomfanekiso wesi-6 (B2, C2), isakhiwo sinokukhubazeka okwengeziwe, okuhambisana nokusatshalaliswa kosayizi wenani le-impedance yokunamathela etholwe ekuhlolweni kokugqwala kwe-electrochemical. Kubonisa ukuthi i-alumina ceramic coating equkethe i-graphene, ikakhulukazi ingxube ye-graphene ne-carbon nanotube, inokumelana nokugqwala okungcono kakhulu. Lokhu kungenxa yokuthi ukwakheka kwe-carbon nanotube ne-graphene kungavimba ngempumelelo ukusakazeka kokuqhekeka futhi kuvikele i-matrix.
7. Ingxoxo nesifinyezo
Ngokuhlolwa kokumelana nokugqwala kwe-carbon nanotubes kanye nezithasiselo ze-graphene ku-alumina ceramic enamathela kanye nokuhlaziywa kwe-microstructure engaphezulu ye-coating, kufinyelelwa iziphetho ezilandelayo:
(1) Lapho isikhathi sokugqwala singu-19 h, wengeza u-0.2% we-hybrid carbon nanotube + 0.2% we-graphene exutshwe impahla ye-alumina ceramic enamathela, ukugqwala kwamanje kukhuphuke kusuka ku-2.890 × 10-6 A / cm2 kwehle kuya ku-1.536 × 10-6 A / 1 cm2, kukhuphuka kagesi kusuka ku-8 A / 1 cm2 28079 Ω, kanye nokusebenza kahle kokumelana nokugqwala kukhulu, 46.85%. Uma kuqhathaniswa nocwecwe lwe-alumina ceramic ehlanzekile, ukuhlanganiswa kwe-graphene kanye ne-carbon nanotubes kunokumelana nokugqwala okungcono.
(2) Ngokukhula kwesikhathi sokucwiliswa kwe-electrolyte, i-electrolyte ingena endaweni ehlangene yokwemboza / i-substrate ukuze ikhiqize ifilimu yensimbi ye-oxide, evimbela ukungena kwe-electrolyte ku-substrate. I-impedance kagesi iqala yehla bese ikhuphuka, futhi ukumelana nokugqwala kwe-alumina ehlanzekile ye-ceramic coating kubi. Ukwakheka nokuhlangana kwe-carbon nanotubes ne-graphene kuvimbe ukungena phansi kwe-electrolyte. Lapho kucwiliswe i-19.5 h, i-impedance kagesi ye-coating equkethe izinto ze-nano yehle ngo-22.94%, 25.60% no-9.61% ngokulandelana, futhi ukumelana nokugqwala kwe-coating kwakukuhle.
(3) Ngenxa yezici zama-carbon nanotubes, ukumbozwa okwengezwe ngama-carbon nanotubes kuphela kunokwakheka okunezimbotshana ezisatshalaliswe ngokulinganayo ngaphambi kokugqwala. Ngemva kokugqwala, izimbotshana zengxenye yokuqala ziba mincane futhi zinde, futhi imigudu iyajula. Isembozo esiqukethe i-graphene sinesakhiwo esiyisicaba ngaphambi kokugqwala, inhlanganisela phakathi kwezinhlayiya ezisembozweni iseduze, futhi izinhlayiya ezihlanganisiwe ziboshwe ngokuqinile ngokunamathela. Nakuba indawo engaphezulu iguguleka yi-electrolyte ngemva kokugqwala, zimbalwa iziteshi zezimbotshana futhi isakhiwo sisaminyene. Ukwakheka kwe-carbon nanotubes ne-graphene kungavimba ngempumelelo ukusakazeka kokuqhekeka futhi kuvikele i-matrix.
Isikhathi sokuthumela: Mar-09-2022