1. Kugadzirira kupfeka
Kuti ufambise bvunzo yekupedzisira ye electrochemical, 30mm inosarudzwa × 4 mm 304 simbi isina tsvina sehwaro. Chipolishi uye bvisa yakasara oxide layer uye ngura makwapa pamusoro pe substrate ne sandpaper, zviise mubeaker ine acetone, bata mavanga ari pamusoro pe substrate ne bg-06c ultrasonic cleaner yeBangjie electronics company for 20min, bvisa marara ari pamusoro pesimbi yakanyungudutswa nemvura, doro uye yakaoma iwo mvura. Zvadaro, alumina (Al2O3), graphene uye hybrid kabhoni nanotube (mwnt-coohsdbs) zvakagadzirirwa muchikamu (100: 0: 0, 99.8: 0.2: 0, 99.8: 0: 0.2, 99.6: 0.2: 0.2), uye kuiswa muchidimbu cheNjiq-mispANDA (Njiq 3 mispANDA) mufekitori yeNanji ball. kugaya bhora nekusanganisa. Iyo inotenderera yekumhanya yebhora regiyo yakaiswa ku220 R / min, uye bhora regiyo rakashandurwa ku.
Mushure mekugaya bhora, isa kumhanya kwekutenderera kwetangi yekugaya bhora kuti ive 1/2 zvachinjana mushure mekunge kugaya kwebhora kwapera, uye isa kumhanya kwekutenderera kwetangi yekugaya bhora kuve 1/2 zvichichinjana mushure mekunge kugaya kwebhora kwapera. Bhora rakagayiwa ceramic aggregate uye binder rakasanganiswa zvakaenzana zvichienderana nehupamhi chikamu che1.0 ∶ 0.8. Pakupedzisira, iyo inonamira ceramic coating yakawanikwa nekurapa maitiro.
2. Corrosion test
Muchidzidzo ichi, iyo electrochemical corrosion test inotora Shanghai Chenhua chi660e electrochemical workstation, uye bvunzo inotora matatu emagetsi test system. Iyo platinamu electrode ndiyo yekubatsira electrode, sirivheri sirivheri chloride electrode ndiyo yereferenzi electrode, uye yakavharwa sampuro ielectrode inoshanda, ine 1cm2 yekuratidzira inoshanda. Batanidza iyo referensi electrode, inoshanda electrode uye anobatsira electrode musero electrolytic nechiridzwa, sezvinoratidzwa Figure 1 uye 2. Pamberi pekuedzwa, sora sampu mu electrolyte, iyo 3.5% NaCl mhinduro.
3. Tafel kuongororwa kwe electrochemical corrosion yezvipfeko
Mufananidzo 3 unoratidza Tafel curve yeuncoated substrate uye ceramic coating yakavharwa neakasiyana nano additives mushure mekuora kwe electrochemical kwe19h. Iyo corrosion voltage, corrosion current density uye magetsi impedance test data yakawanikwa kubva kuelectrochemical corrosion test inoratidzwa muTafura 1.
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Kana iyo corrosion yazvino density idiki uye iyo corrosion kuramba kushanda kwakakwira, iyo corrosion resistance effect yejasi iri nani. Zvinogona kuonekwa kubva kuMufananidzo 3 uye tafura 1 kuti kana nguva yekuora yasvika 19h, iyo yakawanda yekuora voltage yesimbi isina chinhu matrix ndeye -0.680 V, uye kusvibiswa kwemazuva ano kwematrix ndiyo yakakura, inosvika 2.890 × 10-6 A/cm2. PE yaiva 22.01%. Iyo inoratidza kuti iyo ceramic coating inoita basa rekudzivirira riri nani uye inogona kuvandudza kusimba kwekupotera kweiyo coating mu neutral electrolyte.
Apo 0.2% mwnt-cooh-sdbs kana 0.2% graphene yakawedzerwa kumucheka, kusvibiswa kwemazuva ano kwakaderera kwakaderera, kupikisa kwakawedzera, uye kushorwa kwehuputi kwakawedzera kuvandudzwa, ne PE ye38.48% uye 40.10% maererano. Kana iyo nzvimbo yakaputirwa ne0.2% mwnt-cooh-sdbs uye 0.2% graphene yakasanganiswa alumina coating, iyo corrosion ikozvino inoderedzwa kubva 2.890 × 10-6 A / cm2 pasi kusvika 1.536 × 10-6 A / cm2, iyo yakanyanya kuramba kukosha, yakawedzera kubva ku1138 Ω uye 7 Ω 888 Ω. kupfeka kunogona kusvika 46.85%. Zvinotaridza kuti chigadzirwa chakagadzirirwa chakanangana chine kunaka kwekupokana, uye iyo synergistic mhedzisiro yekabhoni nanotubes uye graphene inogona zvinobudirira kuvandudza kushora kuramba kweceramic coating.
4. Mhedzisiro yekunyura nguva pakuvhara impedance
Kuti uenderere mberi nekuongorora kupikisa kwekudzivirira kwekuputira, tichifunga nezve simba rekunyudza nguva yemuenzaniso mu electrolyte pamuedzo, shanduko yekuchinja kwekudzivirira kwezviputi zvina panguva yakasiyana yekunyudzwa inowanikwa, sezvinoratidzwa mumufananidzo 4.
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Padanho rekutanga rekunyudzwa (10 h), nekuda kwehunyoro hwakanaka uye chimiro chejasi, iyo electrolyte yakaoma kunyudza mukati mekupfeka. Panguva ino, iyo ceramic coating inoratidza kupikisa kwakanyanya. Mushure mekunyura kwenguva yakati, kushorwa kunoderera zvakanyanya, nekuti nekufamba kwenguva, iyo electrolyte zvishoma nezvishoma inogadzira chiteshi chekuora kuburikidza nemapores uye kuputika mumucheka uye inopinda mukati me matrix, zvichikonzera kuderera kukuru mukupokana kwejasi.
Muchikamu chechipiri, apo zvigadzirwa zvekuora zvinowedzera kusvika kune imwe chiyero, kupararira kunovharwa uye gaka rinovharwa zvishoma nezvishoma. Panguva imwecheteyo, kana iyo electrolyte ikapinda mukati mekubatana kweiyo bonding pasi layer / matrix, mamorekuru emvura anozobatana neFe element mumatrix pacoating / matrix junction kuburitsa simbi yakatetepa oxide firimu, inotadzisa kupinda kwe electrolyte mumatrix uye inowedzera kukosha kwekupokana. Kana iyo simbi isina matrix yakasvibiswa nemagetsi, mvura zhinji yegirinhi inoyerera inogadzirwa pazasi pe electrolyte. Iyo electrolytic mhinduro haina kuchinja ruvara kana electrolyzing sampu yakavharwa, iyo inogona kuratidza kuvepo kweiyo pamusoro kemikari reaction.
Nekuda kwenguva pfupi yekunyura uye yakakura yekunze pesvedzero zvinhu, kuitira kuti uwedzere kuwana iyo chaiyo shanduko hukama hwe electrochemical paramita, iyo Tafel curves ye19 h uye 19.5 h inoongororwa. Iyo corrosion yazvino density uye kushorwa kunowanikwa nezsimpwin analysis software inoratidzwa muTebhu 2. Inogona kuwanikwa kuti kana yakanyoroveswa kwe19 h, ichienzaniswa neyakashama substrate, iyo corrosion ikozvino density ye pure alumina uye alumina composite coating ine nano additive zvinhu idiki uye kukosha kwekudzivirira kwakakura. Iko kukosha kwekupokana kweceramic coating ine kabhoni nanotubes uye coating ine graphene yakada kufanana, nepo iyo yekubikira dhizaini nekabhoni nanotubes uye graphene composite zvinhu inowedzerwa zvakanyanya, Izvi imhaka yekuti synergistic mhedzisiro yeimwe-dimensional kabhoni nanotubes uye maviri-dimensional graphene inovandudza kushora kwechinhu.
Nekuwedzera kwekunyudza nguva (19.5 h), kushorwa kwevasina substrate kunowedzera, zvichiratidza kuti iri muchikamu chechipiri chekuora uye metal oxide film inogadzirwa pamusoro pe substrate. Saizvozvo, nekuwedzera kwenguva, kushorwa kwealumina ceramic coating yakachena kunowedzerawo, zvichiratidza kuti panguva ino, kunyangwe paine kunonoka kweceramic coating, iyo electrolyte yakapinda iyo bonding interface yejasi / matrix, uye yakagadzira oxide firimu kuburikidza nemakemikari reaction.
Kuenzaniswa nealumina coating ine 0.2% mwnt-cooh-sdbs, iyo alumina coating ine 0.2% graphene uye alumina coating ine 0.2% mwnt-cooh-sdbs uye 0.2% graphene, kupikisa kwekuvhara kwakaderera zvakanyanya nekuwedzera kwenguva, kwakadzikira ne22.94% neremekedzo% 22.9461dic nekuremekedza. kuti electrolyte haina kupinda mujoini pakati pekuputira uye substrate panguva ino, Izvi zvinodaro nekuti chimiro checarbon nanotubes uye graphene chinovharira kudzika kwe electrolyte, nokudaro kudzivirira matrix. Iyo synergistic mhedzisiro yezviviri inosimbiswa zvakare. Iyo yekupfekedza ine maviri nano zvinhu ine zvirinani corrosion resistance.
Kuburikidza neTafel curve uye shanduko yemagetsi impedance kukosha, inowanikwa kuti alumina ceramic coating ine graphene, kabhoni nanotubes uye musanganiswa wavo unogona kuvandudza kushora kwekupokana kwesimbi matrix, uye synergistic mhedzisiro yezviviri izvi zvinogona kuwedzera kuvandudza kusimba kwekupokana kweadhesive ceramic coating. Kuti uwedzere kuongorora mhedzisiro ye nano additives pakupokana kwekupokana kwejasi, iyo micro surface morphology yekupfeka mushure mekuora yakaonekwa.
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Mufananidzo. Mufananidzo 5 (A2) inoratidza kuti nzvimbo mushure mekuora inova yakaoma. Kune iyo substrate isina chinhu, makomba akawanda makuru ekuora anoonekwa pamusoro mushure mekunyudzwa mu electrolyte, zvichiratidza kuti kusaonda kwesimbi isina matrix kwakashata uye electrolyte iri nyore kupinda mukati me matrix. Kune yakachena alumina ceramic coating, sezvakaratidzwa muFigure 5 (B2), kunyange zvazvo porous corrosion channels inogadzirwa mushure mekuora, chimiro chakanyanya kusimba uye yakanakisa kushora kwealumina ceramic coating inonyatso kuvharira kupinda kwe electrolyte, iyo inotsanangura chikonzero chekuvandudzwa kweiyo impedance yealumina ceramic coating.
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Surface morphology yemwnt-cooh-sdbs, machira ane 0.2% graphene uye machira ane 0.2% mwnt-cooh-sdbs uye 0.2% graphene. Zvinogona kuonekwa kuti mabhanhire maviri ane graphene mumufananidzo 6 (B2 neC2) ane chimiro cheflat, kusungirirwa pakati pezvikamu mumucheka kwakasimba, uye zvikamu zvakabatanidzwa zvakaputirwa zvakasimba nekunamatira. Kunyange zvazvo nzvimbo yacho yakanyungudutswa ne electrolyte, nzira shoma dzepore dzinoumbwa. Mushure mekuora, iyo yekuputira nzvimbo yakaoma uye kune mashoma akaremara zvimiro. Kune Mufananidzo 6 (A1, A2), nekuda kwemaitiro emwnt-cooh-sdbs, kupfekedza kusati kwaora kwakagoverwa zvakafanana porous chimiro. Mushure mekuora, ma pores echikamu chepakutanga anove akamanikana uye akareba, uye mugero unova wakadzika. Kuenzaniswa neFigure 6 (B2, C2), chimiro chine hurema hwakawanda, hunoenderana nehukuru hwekugovera coating impedance value inowanikwa kubva electrochemical corrosion test. Zvinotaridza kuti iyo alumina ceramic coating ine graphene, kunyanya musanganiswa wegraphene uye kabhoni nanotube, ine yakanyanya kunaka corrosion resistance. Izvi zvinodaro nekuti chimiro chekabhoni nanotube uye graphene inogona kunyatso kuvharidzira kutsemuka uye kudzivirira matrix.
5. Hurukuro nepfupiso
Kuburikidza neiyo corrosion resistance test yecarbon nanotubes uye graphene additives pane alumina ceramic coating uye kuongororwa kweiyo yepamusoro microstructure yejasi, zvinotevera zvinotorwa:
(1) Kana nguva yekuora yaive 19 h, ichiwedzera 0.2% hybrid kabhoni nanotube + 0.2% graphene yakavhenganiswa zvinhu alumina ceramic coating, iyo ngura yemazuva ano density yakawedzera kubva 2.890 × 10-6 A / cm2 kudzika kusvika 1.536 × 10-6 A / 1 cm 10-6 A / 1 cm2 impance yakawedzera kubva pamagetsi 28079 Ω, uye kusimba kwekusagadzikana ndiko kwakakura, 46.85%. Kuenzaniswa neyakachena alumina ceramic coating, iyo composite coating ine graphene uye kabhoni nanotubes ine nani corrosion kuramba.
(2) Nekuwedzera kwenguva yekunyudzwa kwe electrolyte, iyo electrolyte inopinda mukati mejoint surface ye coating / substrate kuti ibudise metal oxide film, iyo inotadzisa kupinda kwe electrolyte mu substrate. Iyo impedance yemagetsi inotanga kuderera uye yobva yawedzera, uye kuramba kwecorrosion kweyakachena alumina ceramic coating haina kunaka. Chimiro uye synergy yekabhoni nanotubes uye graphene yakavharira kudzika kwakadzika kwe electrolyte. Kana yakanyoroveswa kwe19.5 h, iyo impedance yemagetsi yejasi ine nano zvinhu yakadzikira ne22.94%, 25.60% uye 9.61% zvichiteerana, uye kushorwa kwekupotera kwaive kwakanaka.
6. Kupesvedzera nzira yekuputira corrosion resistance
Kuburikidza neTafel curve uye shanduko yemagetsi impedance kukosha, inowanikwa kuti alumina ceramic coating ine graphene, kabhoni nanotubes uye musanganiswa wavo unogona kuvandudza kushora kwekupokana kwesimbi matrix, uye synergistic mhedzisiro yezviviri izvi zvinogona kuwedzera kuvandudza kusimba kwekupokana kweadhesive ceramic coating. Kuti uwedzere kuongorora mhedzisiro ye nano additives pakupokana kwekupokana kwejasi, iyo micro surface morphology yekupfeka mushure mekuora yakaonekwa.
Mufananidzo. Mufananidzo 5 (A2) inoratidza kuti nzvimbo mushure mekuora inova yakaoma. Kune iyo substrate isina chinhu, makomba akawanda makuru ekuora anoonekwa pamusoro mushure mekunyudzwa mu electrolyte, zvichiratidza kuti kusaonda kwesimbi isina matrix kwakashata uye electrolyte iri nyore kupinda mukati me matrix. Kune yakachena alumina ceramic coating, sezvakaratidzwa muFigure 5 (B2), kunyange zvazvo porous corrosion channels inogadzirwa mushure mekuora, chimiro chakanyanya kusimba uye yakanakisa kushora kwealumina ceramic coating inonyatso kuvharira kupinda kwe electrolyte, iyo inotsanangura chikonzero chekuvandudzwa kweiyo impedance yealumina ceramic coating.
Surface morphology yemwnt-cooh-sdbs, machira ane 0.2% graphene uye machira ane 0.2% mwnt-cooh-sdbs uye 0.2% graphene. Zvinogona kuonekwa kuti mabhanhire maviri ane graphene mumufananidzo 6 (B2 neC2) ane chimiro cheflat, kusungirirwa pakati pezvikamu mumucheka kwakasimba, uye zvikamu zvakabatanidzwa zvakaputirwa zvakasimba nekunamatira. Kunyange zvazvo nzvimbo yacho yakanyungudutswa ne electrolyte, nzira shoma dzepore dzinoumbwa. Mushure mekuora, iyo yekuputira nzvimbo yakaoma uye kune mashoma akaremara zvimiro. Kune Mufananidzo 6 (A1, A2), nekuda kwemaitiro emwnt-cooh-sdbs, kupfekedza kusati kwaora kwakagoverwa zvakafanana porous chimiro. Mushure mekuora, ma pores echikamu chepakutanga anove akamanikana uye akareba, uye mugero unova wakadzika. Kuenzaniswa neFigure 6 (B2, C2), chimiro chine hurema hwakawanda, hunoenderana nehukuru hwekugovera coating impedance value inowanikwa kubva electrochemical corrosion test. Zvinotaridza kuti iyo alumina ceramic coating ine graphene, kunyanya musanganiswa wegraphene uye kabhoni nanotube, ine yakanyanya kunaka corrosion resistance. Izvi zvinodaro nekuti chimiro chekabhoni nanotube uye graphene inogona kunyatso kuvharidzira kutsemuka uye kudzivirira matrix.
7. Hurukuro nepfupiso
Kuburikidza neiyo corrosion resistance test yecarbon nanotubes uye graphene additives pane alumina ceramic coating uye kuongororwa kweiyo yepamusoro microstructure yejasi, zvinotevera zvinotorwa:
(1) Kana nguva yekuora yaive 19 h, ichiwedzera 0.2% hybrid kabhoni nanotube + 0.2% graphene yakavhenganiswa zvinhu alumina ceramic coating, iyo ngura yemazuva ano density yakawedzera kubva 2.890 × 10-6 A / cm2 kudzika kusvika 1.536 × 10-6 A / 1 cm 10-6 A / 1 cm2 impance yakawedzera kubva pamagetsi 28079 Ω, uye kusimba kwekusagadzikana ndiko kwakakura, 46.85%. Kuenzaniswa neyakachena alumina ceramic coating, iyo composite coating ine graphene uye kabhoni nanotubes ine nani corrosion kuramba.
(2) Nekuwedzera kwenguva yekunyudzwa kwe electrolyte, iyo electrolyte inopinda mukati mejoint surface ye coating / substrate kuti ibudise metal oxide film, iyo inotadzisa kupinda kwe electrolyte mu substrate. Iyo impedance yemagetsi inotanga kuderera uye yobva yawedzera, uye kuramba kwecorrosion kweyakachena alumina ceramic coating haina kunaka. Chimiro uye synergy yekabhoni nanotubes uye graphene yakavharira kudzika kwakadzika kwe electrolyte. Kana yakanyoroveswa kwe19.5 h, iyo impedance yemagetsi yejasi ine nano zvinhu yakadzikira ne22.94%, 25.60% uye 9.61% zvichiteerana, uye kushorwa kwekupotera kwaive kwakanaka.
(3) Nekuda kwehunhu hwekabhoni nanotubes, iyo yakawedzera nekabhoni nanotubes chete ine yakagovaniswa porous chimiro isati yaora. Mushure mekuora, ma pores echikamu chepakutanga anove akamanikana uye akareba, uye migero inova yakadzika. Iyo yekupfekedza ine graphene ine chimiro chakati sandara isati yaora, musanganiswa pakati pezvimedu mujasi iri padyo, uye zvidimbu zvakaunganidzwa zvakaputirwa zvakasimba neanonamatira. Kunyangwe nzvimbo yacho yakanyungudutswa ne electrolyte mushure mekuora, pane mashoma pore nzira uye chimiro chichiri chakakora. Chimiro chekabhoni nanotubes uye graphene inogona kunyatso kuvharira kupararira kwekuputika uye kuchengetedza matrix.
Nguva yekutumira: Kurume-09-2022