1. Ukulungiswa kokugquma
Ukuze kuququzelelwe uvavanyo lwe-electrochemical kamva, i-30mm ikhethiwe × 4 mm 304 insimbi engenasici njengesiseko.Pholisha kwaye ususe intsalela ye-oxide kunye namabala omhlwa kumphezulu we-substrate nge-sandpaper, uwafake kwi-beaker ene-acetone, uphathe amabala aphezu kwe-substrate nge-bg-06c i-ultrasonic cleaner ye-Bangjie electronics company for 20min, susa. i-debris yokugqoka ebusweni be-metal substrate kunye notywala kunye namanzi adibeneyo, kwaye uyomise nge-blower.Emva koko, i-alumina (Al2O3), igraphene kunye ne-hybrid carbon nanotube (mwnt-coohsdbs) zalungiswa ngokomlinganiselo (100: 0: 0, 99.8: 0.2: 0, 99.8: 0: 0.2, 99.6: 0.2: 0.2), kwaye zifakwe kwi i-ball mill (qm-3sp2 ye-Nanjing NANDA isixhobo somzi-mveliso) yokugaya ibhola kunye nokuxuba.Isantya esijikelezayo somngqusho webhola sasimiselwe kwi-220 R / min, kwaye ilitye lokusila lijikelwe
Emva kokugaya ibhola, cwangcisa isantya sokujikeleza kwetanki yokusila ukuba ibe yi-1/2 ngokutshintshana emva kokuba ukugaya ibhola kugqityiwe, kwaye usete isantya sokujikeleza kwetanki yokusila ukuba ibe yi-1/2 ngokutshintshanayo emva kokuba ukugaya ibhola kugqityiwe.Ibhola egayiweyo ye-ceramic aggregate kunye ne-binder zixutywe ngokulinganayo ngokobunzima beqhezu le-1.0 ∶ 0.8.Ekugqibeleni, i-adhesive ceramic coating yafunyanwa ngenkqubo yokunyanga.
2. Uvavanyo lokubola
Kolu phononongo, uvavanyo lwe-electrochemical corrosion lwamkela iShanghai Chenhua chi660e i-electrochemical workstation, kwaye uvavanyo lwamkela inkqubo yovavanyo lwe-electrode emithathu.I-electrode yeplatinam yi-electrode encedisayo, i-electrode yesilivere ye-chloride yi-electrode yereferensi, kunye nesampuli edibeneyo yi-electrode esebenzayo, kunye ne-exposure area ye-1cm2.Xhuma i-electrode yereferensi, i-electrode esebenzayo kunye ne-electrode encedisayo kwiseli ye-electrolytic kunye nesixhobo, njengoko kuboniswe kwiMifanekiso 1 kunye ne-2. Ngaphambi kovavanyo, cwilisa isampuli kwi-electrolyte, eyi-3.5% isisombululo se-NaCl.
3. Uhlalutyo lweTafel lwe-electrochemical corrosion of coatings
Umzobo we-3 ubonisa i-curve ye-Tafel ye-substrate engafakwanga kunye ne-ceramic coating efakwe nge-additives ye-nano eyahlukeneyo emva kwe-electrochemical corrosion ye-19h.Amandla ombane wokutya, uxinano lwangoku kunye nedatha yovavanyo lwe-impedance yombane efunyenwe kuvavanyo lwe-electrochemical corrosion iboniswe kwiThebhile yoku-1.
Ngenisa
Xa ingxinano ye-corrosion yangoku incinci kwaye ukusebenza kakuhle kokumelana ne-corrosion kuphezulu, isiphumo sokumelana ne-corrosion ye-coating singcono.Inokubonwa kwi-Figure 3 kunye netheyibhile 1 ukuba xa ixesha lokubola liyi-19h, i-voltage ephezulu ye-corrosion ye-matrix yensimbi engenanto yi-0.680 V, kunye ne-corrosion density yangoku ye-matrix nayo inkulu, ifikelela kwi-2.890 × 10-6 A. /cm2Ibonisa ukuba i-ceramic coating idlala indima engcono yokukhusela kwaye inokuphucula ukuxhatshazwa kwe-corrosion ye-coating kwi-electrolyte engathathi hlangothi.
Xa i-0.2% mwnt-cooh-sdbs okanye i-0.2% i-graphene yongezwa kwi-coating, i-corrosion density yangoku yehla, ukuchasana kwanda, kwaye ukuchasana kwe-corrosion of the coating kwaphuculwa ngakumbi, kunye ne-PE ye-38.48% kunye ne-40.10% ngokulandelanayo.Xa umphezulu uqatywe nge-0.2% ye-mwnt-cooh-sdbs kunye ne-0.2% ye-graphene exutywe ne-alumina exutywe, i-corrosion yangoku iyancipha ngakumbi ukusuka kwi-2.890 × 10-6 A / cm2 ukuya kwi-1.536 × 10-6 A / cm2, ukuxhathisa okuphezulu ixabiso, lenyuka ukusuka kwi-11388 Ω ukuya kwi-28079 Ω, kwaye i-PE yokugqoka inokufikelela kwi-46.85%.Ibonisa ukuba imveliso ejoliswe kuyo elungiselelwe inokumelana nokugqwesa okulungileyo, kunye nefuthe le-synergistic ye-carbon nanotubes kunye ne-graphene inokuphucula ngokufanelekileyo ukuxhatshazwa kwe-corrosion ye-coating ye-ceramic.
4. Impembelelo yexesha lokufunxa kwi-impedance yokwambathisa
Ukuze uphonononge ngakumbi ukuxhathisa kwe-corrosion ye-coating, ngokuqwalasela impembelelo yexesha lokucwiliswa kwesampuli kwi-electrolyte ekuvavanyeni, iijika eziguqukayo zokuchasana kweengubo ezine ngexesha lokuntywiliselwa ezahlukeneyo zifunyenwe, njengoko kubonisiwe kuMfanekiso. 4.
Ngenisa
Kwinqanaba lokuqala lokucwiliswa (i-10 h), ngenxa yobuninzi obuhle kunye nesakhiwo sengubo, i-electrolyte inzima ukucwiliswa kwi-coating.Ngeli xesha, i-ceramic coating ibonisa ukuchasana okuphezulu.Emva kokuntywila kangangexesha elithile, ukuxhathisa kuncipha kakhulu, kuba ngokuhamba kwexesha, i-electrolyte ngokuthe ngcembe yenza umjelo wokutya kwiipores kunye nokuqhekeka kwengubo kwaye ingene kwi-matrix, nto leyo ekhokelela ekunciphiseni okukhulu ukuxhathisa. Ukwaleka.
Kwinqanaba lesibini, xa iimveliso ze-corrosion zinyuka ukuya kwisixa esithile, ukusabalalisa kuvaliwe kwaye i-gap ivalwe ngokuthe ngcembe.Kwangaxeshanye, xa i-electrolyte ingena kujongano oludityanisiweyo lomaleko ophantsi we-bonding / matrix, iimolekyuli zamanzi ziya kusabela kunye ne-Fe element kwi-matrix kwindawo yokwaleka / ye-matrix ukuvelisa ifilimu ecekethekileyo ye-oxide yesinyithi, ethintela ifilimu. ukungena kwe-electrolyte kwi-matrix kwaye kwandisa ixabiso lokumelana.Xa i-metal metric engenanto i-electrochemically corroded, uninzi lwemvula ye-flocculent eluhlaza iveliswa emazantsi e-electrolyte.Isisombululo se-electrolytic asizange sitshintshe umbala xa i-electrolyzing isampuli edibeneyo, enokuthi ibonise ubukho bokusabela kweekhemikhali ezingentla.
Ngenxa yexesha elifutshane lokucwina kunye nezinto ezinkulu zempembelelo zangaphandle, ukwenzela ukuba ufumane ngakumbi ubudlelwane obuchanekileyo beenguqu ze-electrochemical parameters, i-Tafel curves ye-19 h kunye ne-19.5 h ihlalutywa.Ubuninzi be-corrosion yangoku kunye nokuchasana okufunyenwe yi-software yohlalutyo lwe-zsimpwin kuboniswe kwiThebhile 2. Inokufunyanwa ukuba xa ifakwe i-19 h, xa ithelekiswa ne-substrate engenanto, ubuninzi be-corrosion yangoku ye-alumina ecocekileyo kunye ne-alumina composite coating equlethe izinto ezongezelelweyo ze-nano. incinci kwaye ixabiso lokumelana likhulu.Ixabiso lokumelana ne-ceramic coating equlethe i-carbon nanotubes kunye ne-coating equkethe igraphene iphantse yafana, ngelixa isakhiwo sokugquma nge-carbon nanotubes kunye ne-graphene composite materials yandiswa kakhulu, oku kungenxa yokuba impembelelo ye-synergistic ye-carbon-dimensional carbon nanotubes kunye ne-graphene-dimensional graphene. kuphucula ukuxhathisa ukubola kwezinto.
Ngokunyuka kwexesha lokucwiliswa (i-19.5 h), ukuchasana kwe-substrate engenanto kuyanda, kubonisa ukuba kwinqanaba lesibini le-corrosion kunye nefilimu ye-oxide yensimbi iveliswa phezu kwe-substrate.Ngokufanayo, ngokunyuka kwexesha, ukuchasana kwe-alumina ecocekileyo ye-ceramic ye-ceramic nayo iyanda, ebonisa ukuba ngeli xesha, nangona kukho ukucotha kwe-ceramic coating, i-electrolyte ingene kwi-bonding interface ye-coating / matrix, kwaye yavelisa ifilimu ye-oxide. ngokusabela kweekhemikhali.
Xa kuthelekiswa ne-alumina yokugquma equlethe i-0.2% ye-mwnt-cooh-sdbs, i-alumina yokugqoka equkethe i-0.2% yegraphene kunye ne-alumina equkethe i-0.2% ye-mwnt-cooh-sdbs kunye ne-0.2% ye-graphene, ukuchasana kokugquma kwehle kakhulu ngokunyuka kwexesha, kuyancipha. ngo-22.94%, 25.60% kunye ne-9.61% ngokulandelanayo, ebonisa ukuba i-electrolyte ayizange ingene kwindibaniselwano phakathi kwengubo kunye ne-substrate ngeli xesha, Oku kungenxa yokuba ukwakhiwa kwe-carbon nanotubes kunye ne-graphene ibhloka ukungena ezantsi kwe-electrolyte, ngaloo ndlela ikhusela. imatrix.Impembelelo ye-synergistic yezi zibini iqinisekiswa ngakumbi.I-coating equkethe izinto ezimbini ze-nano inokumelana nokugqwala okungcono.
Ngokusebenzisa ijika leTafel kunye nejika lokutshintsha kwexabiso le-impedance yombane, kufunyaniswa ukuba i-alumina ceramic yokwambathisa ngegraphene, i-carbon nanotubes kunye nomxube wabo unokuphucula ukuxhathisa kwe-corrosion ye-metal matrix, kunye nefuthe le-synergistic yezi zibini zinokuphucula ngakumbi ukubola. ukuchasana kwe-adhesive yokugquma i-ceramic.Ukuze uhlolisise ngakumbi umphumo wezongezo ze-nano kwi-corrosion resistance of the coating, i-micro surface morphology ye-coating emva kokuba i-corrosion yabonwa.
Ngenisa
Umzobo 5 (A1, A2, B1, B2) ubonisa i-morphology yomphezulu we-304 eveziweyo yensimbi engenasici kunye ne-alumina ecocekileyo eqatywe iiseramikhi kwi-magnification eyahlukileyo emva kokuhlwa.Umzobo 5 (A2) ubonisa ukuba umphezulu emva kokubola uba rhabaxa.Kwi-substrate engenanto, imingxunya emininzi emikhulu ye-corrosion ivela kumphezulu emva kokuntywiliselwa kwi-electrolyte, ebonisa ukuba ukuxhathisa kwe-corrosion ye-matrix yesinyithi engenanto ihlwempuzekileyo kwaye i-electrolyte kulula ukungena kwi-matrix.Kwimigquba ecocekileyo ye-alumina eludongeni, njengoko kubonisiwe kuMzobo 5 (B2), nangona imijelo enomhlwa evuzayo iveliswa emva kokubola, ubume obuxineneyo kunye nokumelana nokugqwesa kokugqwala kwe-alumina eludongeni ecocekileyo yokwambathisa ithintela ngokufanelekileyo uhlaselo lwe-electrolyte, echaza isizathu ukuphuculwa okusebenzayo kwe-impedance ye-alumina ceramic coating.
Ngenisa
I-Surface morphology ye-mwnt-cooh-sdbs, iingubo eziqulethe i-0.2% yegraphene kunye neengubo eziqulethe i-0.2% ye-mwnt-cooh-sdbs kunye ne-0.2% yegraphene.Ingabonwa ukuba iingubo ezimbini eziqulethe igraphene kuMfanekiso 6 (B2 kunye neC2) zinesakhiwo esicaba, ukubopha phakathi kweengqungquthela kwi-coating kuqinile, kwaye iinqununu ezidibeneyo zihlanganiswe ngokuqinileyo ngokubambelela.Nangona umphezulu ukhukuliswa yi-electrolyte, iziteshi ezincinci ze-pore zenziwe.Emva kokubola, indawo yokugquma ixinene kwaye zimbalwa izakhiwo ezineziphene.KuMzobo we-6 (A1, A2), ngenxa yeempawu ze-mwnt-cooh-sdbs, i-coating ngaphambi kokugqwala yi-porous structure esasazwa ngokufanayo.Emva kokubola, iipores zenxalenye yokuqala ziba zincinci kwaye zide, kwaye umjelo uba nzulu.Xa kuthelekiswa noMfanekiso 6 (B2, C2), isakhiwo sineziphene ezininzi, ezihambelana nobukhulu bokusabalalisa ixabiso le-impedance yokwambathisa elifunyenwe kuvavanyo lwe-electrochemical corrosion.Ibonisa ukuba i-alumina ye-ceramic coating equlethe igraphene, ngakumbi umxube wegraphene kunye ne-carbon nanotube, inokumelana nokugqwala.Oku kungenxa yokuba ukwakhiwa kwekhabhoni nanotube kunye negraphene kunokuthintela ngokufanelekileyo ukusasazwa kokuqhekeka kunye nokukhusela i-matrix.
5. Ingxoxo kunye nesishwankathelo
Ngovavanyo lokuxhathisa umhlwa kwekhabhoni nanotubes kunye nezongezo zegraphene kwi-alumina ceramic yokwambathisa kunye nohlalutyo lomgangatho we-microstructure yokwaleka, ezi zigqibo zilandelayo zenziwa:
(1) Xa ixesha umhlwa 19 h, ukongeza 0.2% hybrid carbon nanotube + 0.2% graphene izinto ezixubeneyo alumina ceramic ukutyabeka, ingxinano umhlwa lwangoku ukusuka 2.890 × 10-6 A / cm2 phantsi ukuya 1.536 × 10-6 A / I-cm2, i-impedance yombane inyuswe ukusuka kwi-11388 Ω ukuya kwi-28079 Ω, kwaye ukusebenza kakuhle kokumelana ne-corrosion yeyona inkulu, i-46.85%.Xa kuthelekiswa ne-alumina esulungekileyo yokugquma ngeceramic, indibaniselwano yokwambathisa ngegraphene kunye nekhabhoni nanotubes inokumelana nokugqwala okungcono.
(2) Ngokunyuka kwexesha lokuntywiliselwa kwe-electrolyte, i-electrolyte ingena kwindawo edibeneyo yokugqoka / i-substrate ukuvelisa ifilimu ye-oxide yensimbi, ethintela ukungena kwe-electrolyte kwi-substrate.I-impedance yombane iyancipha kuqala kwaye inyuke, kwaye ukunyanzeliswa kwe-corrosion ye-alumina ecocekileyo yokwambathisa i-ceramic imbi.Ubume kunye ne-synergy ye-carbon nanotubes kunye ne-graphene ithintele ukungena ezantsi kwe-electrolyte.Xa ifakwe i-19.5 h, i-impedance yombane ye-coating equkethe izinto ze-nano yehla ngo-22.94%, i-25.60% kunye ne-9.61% ngokulandelanayo, kunye nokuxhatshazwa kwe-corrosion ye-coating kwakulungile.
6. Indlela yempembelelo yokumelana nokubola kwe-coating
Ngokusebenzisa ijika leTafel kunye nejika lokutshintsha kwexabiso le-impedance yombane, kufunyaniswa ukuba i-alumina ceramic yokwambathisa ngegraphene, i-carbon nanotubes kunye nomxube wabo unokuphucula ukuxhathisa kwe-corrosion ye-metal matrix, kunye nefuthe le-synergistic yezi zibini zinokuphucula ngakumbi ukubola. ukuchasana kwe-adhesive yokugquma i-ceramic.Ukuze uhlolisise ngakumbi umphumo wezongezo ze-nano kwi-corrosion resistance of the coating, i-micro surface morphology ye-coating emva kokuba i-corrosion yabonwa.
Umzobo 5 (A1, A2, B1, B2) ubonisa i-morphology yomphezulu we-304 eveziweyo yensimbi engenasici kunye ne-alumina ecocekileyo eqatywe iiseramikhi kwi-magnification eyahlukileyo emva kokuhlwa.Umzobo 5 (A2) ubonisa ukuba umphezulu emva kokubola uba rhabaxa.Kwi-substrate engenanto, imingxunya emininzi emikhulu ye-corrosion ivela kumphezulu emva kokuntywiliselwa kwi-electrolyte, ebonisa ukuba ukuxhathisa kwe-corrosion ye-matrix yesinyithi engenanto ihlwempuzekileyo kwaye i-electrolyte kulula ukungena kwi-matrix.Kwimigquba ecocekileyo ye-alumina eludongeni, njengoko kubonisiwe kuMzobo 5 (B2), nangona imijelo enomhlwa evuzayo iveliswa emva kokubola, ubume obuxineneyo kunye nokumelana nokugqwesa kokugqwala kwe-alumina eludongeni ecocekileyo yokwambathisa ithintela ngokufanelekileyo uhlaselo lwe-electrolyte, echaza isizathu ukuphuculwa okusebenzayo kwe-impedance ye-alumina ceramic coating.
I-Surface morphology ye-mwnt-cooh-sdbs, iingubo eziqulethe i-0.2% yegraphene kunye neengubo eziqulethe i-0.2% ye-mwnt-cooh-sdbs kunye ne-0.2% yegraphene.Ingabonwa ukuba iingubo ezimbini eziqulethe igraphene kuMfanekiso 6 (B2 kunye neC2) zinesakhiwo esicaba, ukubopha phakathi kweengqungquthela kwi-coating kuqinile, kwaye iinqununu ezidibeneyo zihlanganiswe ngokuqinileyo ngokubambelela.Nangona umphezulu ukhukuliswa yi-electrolyte, iziteshi ezincinci ze-pore zenziwe.Emva kokubola, indawo yokugquma ixinene kwaye zimbalwa izakhiwo ezineziphene.KuMzobo we-6 (A1, A2), ngenxa yeempawu ze-mwnt-cooh-sdbs, i-coating ngaphambi kokugqwala yi-porous structure esasazwa ngokufanayo.Emva kokubola, iipores zenxalenye yokuqala ziba zincinci kwaye zide, kwaye umjelo uba nzulu.Xa kuthelekiswa noMfanekiso 6 (B2, C2), isakhiwo sineziphene ezininzi, ezihambelana nobukhulu bokusabalalisa ixabiso le-impedance yokwambathisa elifunyenwe kuvavanyo lwe-electrochemical corrosion.Ibonisa ukuba i-alumina ye-ceramic coating equlethe igraphene, ngakumbi umxube wegraphene kunye ne-carbon nanotube, inokumelana nokugqwala.Oku kungenxa yokuba ukwakhiwa kwekhabhoni nanotube kunye negraphene kunokuthintela ngokufanelekileyo ukusasazwa kokuqhekeka kunye nokukhusela i-matrix.
7. Ingxoxo kunye nesishwankathelo
Ngovavanyo lokuxhathisa umhlwa kwekhabhoni nanotubes kunye nezongezo zegraphene kwi-alumina ceramic yokwambathisa kunye nohlalutyo lomgangatho we-microstructure yokwaleka, ezi zigqibo zilandelayo zenziwa:
(1) Xa ixesha umhlwa 19 h, ukongeza 0.2% hybrid carbon nanotube + 0.2% graphene izinto ezixubeneyo alumina ceramic ukutyabeka, ingxinano umhlwa lwangoku ukusuka 2.890 × 10-6 A / cm2 phantsi ukuya 1.536 × 10-6 A / I-cm2, i-impedance yombane inyuswe ukusuka kwi-11388 Ω ukuya kwi-28079 Ω, kwaye ukusebenza kakuhle kokumelana ne-corrosion yeyona inkulu, i-46.85%.Xa kuthelekiswa ne-alumina esulungekileyo yokugquma ngeceramic, indibaniselwano yokwambathisa ngegraphene kunye nekhabhoni nanotubes inokumelana nokugqwala okungcono.
(2) Ngokunyuka kwexesha lokuntywiliselwa kwe-electrolyte, i-electrolyte ingena kwindawo edibeneyo yokugqoka / i-substrate ukuvelisa ifilimu ye-oxide yensimbi, ethintela ukungena kwe-electrolyte kwi-substrate.I-impedance yombane iyancipha kuqala kwaye inyuke, kwaye ukunyanzeliswa kwe-corrosion ye-alumina ecocekileyo yokwambathisa i-ceramic imbi.Ubume kunye ne-synergy ye-carbon nanotubes kunye ne-graphene ithintele ukungena ezantsi kwe-electrolyte.Xa ifakwe i-19.5 h, i-impedance yombane ye-coating equkethe izinto ze-nano yehla ngo-22.94%, i-25.60% kunye ne-9.61% ngokulandelanayo, kunye nokuxhatshazwa kwe-corrosion ye-coating kwakulungile.
(3) Ngenxa yeempawu ze-carbon nanotubes, i-coating eyongeziweyo kunye ne-carbon nanotubes yodwa inesakhiwo esisasazwa ngokulinganayo ngaphambi kokubola.Emva kokubola, iipores zenxalenye yokuqala ziba zincinci kwaye zide, kwaye iziteshi ziba nzulu.I-coating equkethe i-graphene inesakhiwo esisicaba phambi kokubola, ukudibanisa phakathi kweengqungquthela zokugqoka kusondele, kwaye i-aggregate particles ihlanganiswe ngokuqinileyo nge-adhesive.Nangona umphezulu ukhukuliswa yi-electrolyte emva kokubola, zimbalwa iziteshi zepore kwaye isakhiwo sisaxinene.Ukwakhiwa kwekhabhoni nanotubes kunye negraphene kunokuthintela ngokufanelekileyo ukusasazwa kokuqhekeka kunye nokukhusela i-matrix.
Ixesha lokuposa: Mar-09-2022