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Kunitsugu Aramaki - One of the best experts on this subject based on the ideXlab platform.
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Preparation of self-healing protective films on a Zinc Electrode treated in a cerium(III) nitrate solution and modified with sodium phosphate and cerium(III) nitrate
Corrosion Science, 2004Co-Authors: Kunitsugu AramakiAbstract:Abstract Self-healing protective films were prepared on a Zinc Electrode previously treated in a Ce(NO3)3 solution by modification with Na3PO4 and Ce(NO3)3. The protective and self-healing abilities of the films were examined by polarization measurements and observation of pit formation after the Electrode was scratched with a knife-edge crosswise and immersed in oxygenated 0.5 M NaCl at 30 °C for many hours. Mechanisms of the protective and self-healing activities were discussed using X-ray photoelectron spectroscopy and electron-probe microanalysis. The protective and self-healing abilities of the films prepared on the Zinc Electrode by treatment in the Ce(NO3)3 solution and modification with Na3PO4 plus Ca(NO3)2, Mg(NO3)2, Zn(NO3)2 or Ce(NO3)3 were summarized.
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Self-healing protective films prepared on Zinc Electrodes by treatment in a cerium(III) nitrate solution and modification with sodium phosphate and calcium or magnesium nitrate
Corrosion Science, 2003Co-Authors: Kunitsugu AramakiAbstract:Self-healing protective films were prepared on a Zinc Electrode by treatment in a Ce(NO3)3 solution and modification with Na3PO4 and Ca(NO3)2 or Mg(NO3)2. The protective and self-healing abilities of the films were examined by polarization measurements and observation of pit formation after the Electrode was scratched with a knife-edge and immersed in aerated 0.5 M NaCl for many hours. The protective efficiency of the film modified with Ca(NO3)2 was higher than that of the film without Ca(NO3)2 but the self-healing ability of the former film was not sufficiently high during the prolonged immersion. Mechanisms of the protective and self-healing activities were discussed using X-ray photoelectron spectroscopy and electron-probe microanalysis.
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self healing mechanism of a protective film prepared on a ce no3 3 pretreated Zinc Electrode by modification with zn no3 2 and na3po4
Corrosion Science, 2003Co-Authors: Kunitsugu AramakiAbstract:Abstract Self-healing mechanism of a protective film against corrosion of Zinc at scratches in an aerated 0.5 M NaCl solution was investigated by polarization measurements, X-ray photoelectron spectroscopy (XPS) and electron-probe microanalysis (EPMA). The film was prepared on a Zinc Electrode by treatment in a Ce(NO 3 ) 3 solution and addition of aqueous solutions containing 9.98 or 19.9 μg/cm 2 of Zn(NO 3 ) 2 · 6H 2 O and 55.2 μg/cm 2 of Na 3 PO 4 · 12H 2 O. After the coated Electrode was scratched with a knife-edge crosswise and immersed in the NaCl solution for many hours, polarization measurements, observation of pit formation at the scratches, XPS and EPMA were carried out. This film was remarkably protective and self-healing against Zinc corrosion on the scratched Electrode. The cathodic and anodic processes of Zinc corrosion were markedly suppressed by coverage of the surface except for scratches with a thin Ce 2 O 3 layer containing a small amount of Ce 4+ and the surface of scratches with a layer composed of Zn 3 (PO 4 ) 2 · 4H 2 O, Zn(OH) 2 and ZnO mostly.
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Improvement in the self-healing ability of a protective film consisting of hydrated cerium(III) oxide and sodium phosphate layers on Zinc
Corrosion Science, 2003Co-Authors: Kunitsugu AramakiAbstract:Abstract A self-healing protective film prepared on a Zinc Electrode by previous treatment in a Ce(NO 3 ) 3 solution and coverage with a Na 3 PO 4 layer was improved by the addition of Zn(NO 3 ) 2 . The protective and self-healing abilities of the films against corrosion of Zinc in an aerated 0.5 M NaCl solution were examined by polarization measurements and observation of pit-like anodic dissolution feature (plf) and pit formation after the Electrode was scratched with a knife-edge crosswise and immersed in the solution for many hours. The film prepared on the pretreated Electrode coated with 9.98 or 19.9 μg/cm 2 of Zn(NO 3 ) 2 · 6H 2 O and 55.2 μg/cm 2 of Na 3 PO 4 · 12H 2 O was significantly protective and self-healing against Zinc corrosion on the scratched Electrode. The protective efficiency of the film was more than 96% in the region of the immersion time between 72 and 360 h. No plf was observed at the scratches after immersion for 120 h. Results of Fourier transform infrared reflection and X-ray photoelectron spectroscopies revealed that the film was composed of Na 3 PO 4 , Zn 3 (PO 4 ) 2 and Ce 2 O 3 layers.
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xps and epma studies on self healing mechanism of a protective film composed of hydrated cerium iii oxide and sodium phosphate on Zinc
Corrosion Science, 2003Co-Authors: Kunitsugu AramakiAbstract:Abstract A thin, protective film was prepared on a Zinc Electrode by coverage with a hydrated Ce2O3 layer and 0.0552 mg/cm2 of a Na3PO4 · 12H2O deposit layer and by drying the layers at 90 °C for 23 h, as has been reported in the preceding paper. This film was highly self-healing at the scratched Electrode in an aerated 0.5 M NaCl solution for many hours. The present investigation deals with elucidation on self-healing mechanism of this film by X-ray photoelectron spectroscopy and electron-probe microanalysis. The scratched surface was covered with deposits of Zn(OH)2, ZnO and small amount of Zn3(PO4)2. Both cathodic and anodic processes of Zinc corrosion were markedly suppressed by coverage of the scratches with the deposits, resulting in the self-healing activity at the scratched Electrode in 0.5 M NaCl.
Yunhui Huang - One of the best experts on this subject based on the ideXlab platform.
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v2o5 nanopaper as a cathode material with high capacity and long cycle life for rechargeable aqueous Zinc ion battery
Nano Energy, 2019Co-Authors: Zhimei Huang, Pramod K Kalambate, Yun Zhong, Zhaoming Huang, Meilan Xie, Yue Shen, Yunhui HuangAbstract:Abstract Aqueous batteries are suitable for large scale energy storage due to cost and safety concerns. Among all aqueous batteries, rechargeable aqueous Zinc-ion battery is a promising choice because Zinc Electrode has low equilibrium potential, high exchange current density, and high hydrogen evolution overpotential. However, since Zinc ion is a divalent cation, it is difficult to find a cathode material in which Zinc ion can reversibly insert and extract. In this work, we introduce a novel V2O5 nanopaper consisting of V2O5 nanofibers and carbon nanotubes as reversible Zn-ion cathode. V2O5 has a layered crystalline structure. The spaces between the oxide layers may serve as 2-dimensional diffusion pathways for Zn ions. Meanwhile, the nanofiber morphology endows the material with short ionic diffusion distance and may tolerate high volume change. As a result, the V2O5 nanopaper cathode delivers a high capacity of 375 mAh g−1 and long cycle life up to 500 cycles.
Fabio La Mantia - One of the best experts on this subject based on the ideXlab platform.
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an aqueous Zinc ion battery based on copper hexacyanoferrate
Chemsuschem, 2015Co-Authors: Rafael Trocoli, Fabio La MantiaAbstract:: A new Zinc-ion battery based on copper hexacyanoferrate and Zinc foil in a 20 mM solution of Zinc sulfate, which is a nontoxic and noncorrosive electrolyte, at pH 6 is reported. The voltage of this novel battery system is as high as 1.73 V. The system shows cyclability, rate capability, and specific energy values near to those of lithium-ion organic batteries based on Li4 Ti5 O12 and LiFePO4 at 10 C. The effects of Zn(2+) intercalation and H2 evolution on the performance of the battery are discussed in detail. In particular, it has been observed that hydrogen evolution can cause a shift in pH near the surface of the Zinc Electrode, and favor the stabilization of Zinc oxide, which decreases the performance of the battery. This mechanism is hindered when the surface of Zinc becomes rougher.
Freire C.m.a. - One of the best experts on this subject based on the ideXlab platform.
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Study Of The Performance Of Films Containing Rare Earth Salts As Corrosion Inhibitors Of Zinc-iron Alloy Electroplated Steel [estudo Do Desempenho De Filmes Contendo Sais De Terras Raras Como Inibidores De Corrosão Da Liga Znfe Eletrodepositada Sobre Aço]
'FapUNIFESP (SciELO)', 2015Co-Authors: Dos Santos M.c.g., Freire C.m.a.Abstract:Zinc-iron alloy electroplated steel is a material commonly used in the construction industries and automotive. This Zinc-based material needs, however, to be protected against corrosive environments through a surface treatment that generally has hexavalent chromium, which is toxic to the environment and may cause cancer to human being. This paper shows a study with the films of rare earth (Ce or La) on the Zinc-iron alloy electroplated steel. These films were evaluated using Polarization Curves, Electrochemical Impedance Spectroscopy (EIS), Scanning Electron Microscopy (SEM) and EDS. The X-ray photoelectron spectroscopy (XPS) was also used to prove the existence of oxide films on the surface of Zinc-iron alloy electroplated steel. The EIS and Polarization results have shown that the systems under study were efficient against corrosion and its performance depended upon the type of salt. The sample ZnFe+Ce proved to have the best inhibitors against corrosion. The cathodic branch of the polarization curve presents a decrease in order of 10 times in the current density when the ZnFe alloy coating were treated with rare earth and IZI increase in order of one time at the same circumstance.17411441157(2000) End-Of-Life Vehicles, , OJEC- Official Journal of the Europe Communities - Directive 2000/53/ec of the European Parliament and of the Concil, 18- setembroAldykiewicz, A.J., Davenport, A.J., Isaacs, H.S., Studies of the formation of cerium-rich protective films using x-ray absorption near-edge spectrocopy and rotating disk Electrode methods (1996) Journal of Electrochemical Society, 143 (1), pp. 147-154Palomino, L.M., Aoki, I.V., Demelo, H.G., Microstructural and electrochemical characterization of Ce conversion layers formed on Al alloy 2024-T3 covered with Cu-rich smut (2006) Electrochimica Acta, 51, pp. 5943-5953Andreatta, F., Druart, M.E., Lanzurtti, A., Localized corrosion inhibition by cerium species on clad AA2024 aluminium alloy investigated by means of electrochemical micro-cell (2012) Corrosion Science, 65, pp. 376-386. , DecemberTakeuchi, S.M.T., Azambuja, D.S., Costa, I., Cerium conversion layer for improving the corrosion resistance of phosphated NdFeB magnets (2006) Surface and Coatings Technology, 201 (6), pp. 3670-3675. , DecemberSantos, M.C.G., (2005) Avaliação do desempenho de filmes contendo silanos e sais de terras raras para proteção contra corrosão de camadas ZnFe eletrodepositadas, D.Sc, p. 130. , Faculdade De Engenharia Mecânica, Universidade Estadual de Campinas, Campinas -SPAramaki, K., The inhibition effects of cation inhibitors on corrosion of Zinc in aerated 0.5M NaCl (2001) Corrosion Science, 43, pp. 591-604. , JulyAramaki, K., Preparation of self-healing protective films on a Zinc Electrode treated in a cerium (III) nitrate solution and modified with sodium phosphate and cerium (III) nitrate (2003) Corrosion Science, 46, pp. 1565-1579. , SeptemberAramaki, K., Treatment of Zinc surface with cerium (III) nitrate to prevent Zinc corrosion in aerated 0.5M NaCl (2001) Corrosion Science, 43, pp. 2201-2215. , NovemberMontemor, M.F., Simôes, A.M.P., Ferreira, M.G.S., Composition and behaviour of cerium films on galvanised steel (2001) Progress In Organic Coatings, 43 (4), pp. 274-281. , DecemberFerreira, M.G.S., Duarte, R.G., Montemor, M.F., Silanes and rare earth salts as chromate replacers for pre-treatments on galvanized steel (2004) Electrochimica Acta, 49, pp. 2927-2935Peng, T., Man, R., Rare earth and silane as chromate replacers for corrosion protection on galvanized steel (2009) Journal of Rare Earths, 27, pp. 159-163Balasubramaniam, M., Melendres, C.A., Mansour, A.N., An X-ray absorption study of the local structure of cerium in electrochemically deposited thin films (1999) Thin Solid Films, 347, pp. 178-183Tamborim, S.M., Maisonave, A.P.Z., Azambuja, D.S., An electrochemical and superficial assessment of the corrosion behavior of AA 2024-T3 treated with etacryloxypropylmethoxysilane and cerium nitrate (2008) Surface and Coatings Technology, 202 (24), pp. 5991-6001. , AugustKautec, W., Share, M., Paatsh, W., Transition metal effects in the corrosion protection of elestroplated Zinc alloy coatings (1994) Electrocchimica Acta, 39, pp. 1151-1157Tromat, N., Gautiersoyer, M., Bordier, G., Formation of the Ce/Y2O3 interface: An in XPS study (1996) Surface Science, 345, pp. 290-302Howng, W.Y., Thorn, R.J., Investigation of the electronic structure of La1- X (M+2)XCrO3, Cr2O3 and La2O3 by X-Ray photoelectron-spectroscopy (1980) Journal Physics and Chemistry of Solids, 41 (1), pp. 75-81Aballe, A., Benthecourt, M., Botana, F.J., CeCl3 and LaCl3 binary solutions as environment-friendly corrosion inhibitors of AA5083 Al-Mg alloy in NaCl solutions (2001) Journal of Alloys and Compounds, 323-324, pp. 855-858Rudd, A.L., Breslid, C.B., Mansfeld, F., The corrosion protection afforded by rare earth conversion coatings applied to magnesium (2000) Corrosion Science, 42 (1-2), pp. 275-288Lumpp, S.N., (2005) Obtenção De Filmes Passivantes De Molibidato De Amônio E Nitrato De Cério Para Ligas De Zinco Eletrodepositadas, D.Sc., Pp, 130. , Faculdade de Engenharia Mecânica, Universidade Estadual de Campinas, Campinas-S
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Evaluation Of Corrosion Resistance Of Steel Coated With Zinc-iron Alloy Electrodeposits Containing Btse, Btespts And Rare Earth Salts As Conversion Films [avaliação Da Resistência à Corrosão De Eletrodepósitos De Liga Znfe Sobre Aço Tratado Com Filmes Contendo Sais De Terras Raras E Silanos Btse, Btespts]
Universidade Federal do Rio de Janeiro, 2015Co-Authors: Dos Santos M.c.g., Freire C.m.a.Abstract:This study aims to evaluate the corrosion resistance of steel coated with ZnFe alloy Electrodeposits treated with films consisted of a pre-layer obtained through immersion in a rare earth salt solution using Ce or La elements plus a silane thin film of BTSE (bis 1, 2 - [triethoxysilyl]) ethane) and / or BTESPTS (bis-(3 - [triethoxysilyl]-propyl) - tetrassulfeto). These systems were evaluated by polarization curves, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The polarization and EIS results indicated that the studied systems were effective against corrosion and that their performance depends on the type of cation salt. The ZnFe + Ce + + BTSE BTESPTS system proved to be the best result against corrosion.18415761586Souza, M.E.P., (2006) Avaliação de Revestimentos Híbridos Organo-inorgânicos e de Resinas Polissiloxanas Aplicadas sobre Aço Galvanizado e sobre Camadas de ZnFe., , Tese de D. Sc., Faculdade de Engenharia Mecânica, Universidade Estadual de Campinas, Campinas, SP, BrasilCorrêa, A.G., Zuin, V.G., (2009) Química Verde: Fundamentos e aplicações, 5. , São Carlos, Edufscar(2000) Directive 2000/53/ec of the European Parliament and of the Concil, , OJEC-Official Journal of the Europe Communities-End-of-Life Vehicles-18-setembroSantos, M.C.G., (2005) Estudo de Filmes Poliméricos contendo Silanos α-UPS e VS como Revestimentos Promotores de Adesão em Superfícies Galvanizadas e Eletrodepósitos de Ligas Zn/Fe e Zn/Co., , Dissertação de M. Sc., Faculdade de Engenharia Mecânica, Universidade Estadual de Campinas, Campinas-SPKasten, L.S., Grant, J.T., Grebasch, An XPS study of cerium dopants in sol-gel coatings for aluminum 2024-T3 (2001) Surface and Coatings Technology, 140 (1), pp. 11-15Garcia-Heras, M., Jimenez Morales, A., Casal, B., Preparation and electrochemical study of cerium-silica sol-gel thin films (2004) Journal of Alloys and Compounds, 380 (1-2), pp. 219-224Peng, S., Zhao, W., Zeng, Z., Preparation of anticorrosion hybrid silica sol-gel coating using Ce(NO3)3 as catalyst (2013) J. Sol-Gel Sci Technol, 66 (1), pp. 133-138Aramaki, K., The inhibition effects of cation inhibitors on corrosion of Zinc in aerated 0.5M NaCl (2001) Corrosion Science, 43 (8), pp. 591-604Aramaki, K., Preparation of self-healing protective films on a Zinc Electrode treated in a cerium (III) nitrate solution and modified with sodium phosphate and cerium (III) nitrate (2003) Corrosion Science., 46 (6), pp. 1565-1579. , SepAramaki, K., Preparation of chromate-free, self-healing polymer films containing sodium silicate on Zinc pretreated in a cerium(III) nitrate solution for preventing Zinc corrosion at scratches in 0.5 M NaCl (2002) Corrosion Science, 44 (6), pp. 1375-1389. , June 2002Aramaki, K., Self-healing protective films prepared on Zinc Electrodes by treatment in a cerium(III) nitrate solution and modification with sodium phosphate and calcium or magnesium nitrate (2003) Corrosion Science, 45 (10), pp. 2361-2376Aramaki, K., Prevention of Zinc corrosion in oxygenated 0.5 M NaCl by treatment in a cerium (III) nitrate solution and modification with sodium hexadecanoate (2006) Corrosion Science, 48 (10), pp. 3298-3308Aramaki, K., Self-healing protective films prepared on Zinc by treatments with cerium (III) nitrate and sodium phosphate (2002) Corrosion. Science, 44 (11), pp. 2621-2634Zhu, D., Ooij, W.J.V., Corrosion protection of AA 2024-T3 by bis-[3-(triethoxysilyl)propyl]tetrasulfide in sodium chloride solution. Part 2: Mechanism for Corrosion Protection (2003) Corrosion Science, 45 (10), pp. 2177-2197Ferreira, M.G.S., Duarte, R.G., Montemor, M.F., Silanes and rare earth salts as chromate replacers for pre-treatments on galvanized steel (2004) Electrochimica acta, 49 (17-18), pp. 2927-2935Peng, T., Man, R., Rare earth and silane as chromate replacers for corrosion protection on galvanized steel (2009) Journal of rare Earths, 27 (1), pp. 159-163Aramaki, K., Self-healing mechanism of an organosiloxane polymer film containing sodium silicate and cerium(III) nitrate for corrosion of scratched Zinc surface in 0.5 M NaCl (2002) Corrosion Science, 44 (7), pp. 1621-1632Trabelsi, W., Cecilio, P., Ferreira, M.G.S., Electrochemical assessment of the self-healing properties of Ce-doped silane solutions for the pre-treatment of galvanized steel substrates (2005) Progress in Organic Coatings, 54 (4), pp. 276-284Trabelsi, W., Triki, E., Dhouibi, L., The use of pre-treatments based on doped silane solutions for improved corrosion resistance of galvanized steel substrates (2006) Surface & Coatings Technology, 200, pp. 4240-4250Santos, M.C.G., (2005) Avaliação do desempenho de filmes contendo silanos e sais de terras raras para proteção contra corrosão de camadas ZnFe eletrodepositadas, , Tese de D. Sc., Faculdade de Engenharia Mecânica, Universidade Estadual de Campinas, Campinas, SP, BrasilOliveira, M.F., (2006) Estudo da Influência de organo-silanos na resistência à corrosão de aço carbono por meio de técnicas eletroquímicas, , Tese de D. Sc., Departamento de Engenharia Metalúrgica e de Materiais, Escola Politécnica da Universidade de São Paulo, São Paulo, SP, BrasilFerreira, M.G.S., Duarte, R.G., Montemor, M.F., Silanes and rare earth salts as chromate replacers for pré-treatments on galvanized steel (2004) Electrochimica Acta, 49 (17-18), pp. 2927-2935Cabral, A., Duarte, R.G., Montemor, M.F., Analytical characterisation and corrosion behaviour of bis-[triethoxysilylpropyl]tetrasulphide pre-treated AA2024-T3 (2005) Corrosion Science, 47 (3), pp. 869-881Cabral, A.M., Trabelsi, W., Serra, R., The corrosion resistance of hot dip galvanized steel and AA2024-T3 pre-treated with bis-[triethoxysilylpropyl] tetrasulfide solutions doped with Ce(NO3)3 (2006) Corrosion Science, 48 (11), pp. 3470-3758Trabelsi, W., Triki, E., Dhouibi, L., The use of pre-treatments based on doped silane solutions for improved corrosion resistance of galvanized steel substrate (2006) Surf. Coat. Technol, pp. 4240-4250Zhu, D., Ooij, W.J.V., Enhanced corrosion resistance of AA2024-T3 and hot-dip galvanised steel using mixture of bis-[triethoxysilylpropyl] tetrasulfide and bis-[triethoxysilylpropyl]amine (2004) Electrochimica Acta, 49 (7), pp. 1113-112
Zhimei Huang - One of the best experts on this subject based on the ideXlab platform.
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v2o5 nanopaper as a cathode material with high capacity and long cycle life for rechargeable aqueous Zinc ion battery
Nano Energy, 2019Co-Authors: Zhimei Huang, Pramod K Kalambate, Yun Zhong, Zhaoming Huang, Meilan Xie, Yue Shen, Yunhui HuangAbstract:Abstract Aqueous batteries are suitable for large scale energy storage due to cost and safety concerns. Among all aqueous batteries, rechargeable aqueous Zinc-ion battery is a promising choice because Zinc Electrode has low equilibrium potential, high exchange current density, and high hydrogen evolution overpotential. However, since Zinc ion is a divalent cation, it is difficult to find a cathode material in which Zinc ion can reversibly insert and extract. In this work, we introduce a novel V2O5 nanopaper consisting of V2O5 nanofibers and carbon nanotubes as reversible Zn-ion cathode. V2O5 has a layered crystalline structure. The spaces between the oxide layers may serve as 2-dimensional diffusion pathways for Zn ions. Meanwhile, the nanofiber morphology endows the material with short ionic diffusion distance and may tolerate high volume change. As a result, the V2O5 nanopaper cathode delivers a high capacity of 375 mAh g−1 and long cycle life up to 500 cycles.
