TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO

Detalhes bibliográficos
Autor(a) principal: Alves, Guilherme José Turcatel
Data de Publicação: 2018
Tipo de documento: Tese
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações do UNICENTRO
Texto Completo: http://tede.unicentro.br:8080/jspui/handle/jspui/1573
Resumo: Many industrial sectors need to use metallic materials with the intention of promoting the use of more efficient and sustainable equipment and structures. As application, aluminum can be used providing characteristics such as: lightness, mechanical resistance, electrical conductivity and corrosion resistance. To increase the aluminum durability, the anodizing process is the most used. Dyes are also widely used in anodized aluminum because they provide a more adherent layer, promoting greater versatility, corrosion protection and embellishment to the metallic material. In very aggressive environments, such as acidic or chloride-containing atmospheres, a more efficient protective coating is required. The ammoniacal niobium complex (NH4[NbO(C2O4)2(H2O)].nH2O) has been used as an additive in coatings to improve their resistance in these environments. This work has as main objective to develop surface treatments with ammoniacal niobium complex, for the aluminum alloy AA5052, anodized, with and without coloration. It was used the experimental design, associated with the following techniques: anodization, anodic potentiodynamic polarization, X-ray fluorescence spectroscopy, X-ray diffractometry, scanning electron microscopy, X-ray dispersive energy spectroscopy, optical microscopy, electrochemical impedance spectroscopy and Raman microscopy. The electrochemical results showed high polarization resistance (Rp) in 0.5 mol L-1 Na2SO4, pH 4, for anodized aluminum, at current density (j) in the order of 10 mA cm-2 and anodizing time (t) of 20 minutes. In the coloring process, two improved conditions were obtained: (1) t = 10 minutes and dye concentration ([C]) = 2.0 g L-1 and (2) t = 20 minutes and [C] = 1.0 g L-1. These results lead industry to economy, with reducing the use of energy or production materials. The insertion of the ammoniacal niobium complex on the anodized aluminum was applied using the sol-gel technique, followed by heat treatment of the metal surface at 350°C and 450°C without and with a heating ramp of 10°C min-1. The aluminum samples treated at 450°C allowed the tartrazine yellow dye to be inserted, thus improving corrosion protection and a metallic surface embellishment (colored). Samples treated at 350°C, without heating ramp, showed high resistance to localized corrosion (pitting) in systems containing 0.5 mol L-1 NaCl. This resistance refers to the non-existence of pitting potential throughout the electrochemical anodic section studied, when the molar ratio of NH4[NbO(C2O4)2(H2O)].nH2O of 0.15 and 0.20 was used, in relation of glycerin and citric acid, employed in the sol-gel production.
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spelling Rodrigues, Paulo Rogério Pintohttp://lattes.cnpq.br/1559766893291724043.657.839-55http://lattes.cnpq.br/5917871102224665Alves, Guilherme José Turcatel2021-04-28T16:55:02Z2018-10-26Alves, Guilherme José Turcatel. TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO. 2018. 145 f. Tese (Programa de Pós-Graduação em Química - Doutorado) - Universidade Estadual do Centro-Oeste, Guarapuava-PR.http://tede.unicentro.br:8080/jspui/handle/jspui/1573Many industrial sectors need to use metallic materials with the intention of promoting the use of more efficient and sustainable equipment and structures. As application, aluminum can be used providing characteristics such as: lightness, mechanical resistance, electrical conductivity and corrosion resistance. To increase the aluminum durability, the anodizing process is the most used. Dyes are also widely used in anodized aluminum because they provide a more adherent layer, promoting greater versatility, corrosion protection and embellishment to the metallic material. In very aggressive environments, such as acidic or chloride-containing atmospheres, a more efficient protective coating is required. The ammoniacal niobium complex (NH4[NbO(C2O4)2(H2O)].nH2O) has been used as an additive in coatings to improve their resistance in these environments. This work has as main objective to develop surface treatments with ammoniacal niobium complex, for the aluminum alloy AA5052, anodized, with and without coloration. It was used the experimental design, associated with the following techniques: anodization, anodic potentiodynamic polarization, X-ray fluorescence spectroscopy, X-ray diffractometry, scanning electron microscopy, X-ray dispersive energy spectroscopy, optical microscopy, electrochemical impedance spectroscopy and Raman microscopy. The electrochemical results showed high polarization resistance (Rp) in 0.5 mol L-1 Na2SO4, pH 4, for anodized aluminum, at current density (j) in the order of 10 mA cm-2 and anodizing time (t) of 20 minutes. In the coloring process, two improved conditions were obtained: (1) t = 10 minutes and dye concentration ([C]) = 2.0 g L-1 and (2) t = 20 minutes and [C] = 1.0 g L-1. These results lead industry to economy, with reducing the use of energy or production materials. The insertion of the ammoniacal niobium complex on the anodized aluminum was applied using the sol-gel technique, followed by heat treatment of the metal surface at 350°C and 450°C without and with a heating ramp of 10°C min-1. The aluminum samples treated at 450°C allowed the tartrazine yellow dye to be inserted, thus improving corrosion protection and a metallic surface embellishment (colored). Samples treated at 350°C, without heating ramp, showed high resistance to localized corrosion (pitting) in systems containing 0.5 mol L-1 NaCl. This resistance refers to the non-existence of pitting potential throughout the electrochemical anodic section studied, when the molar ratio of NH4[NbO(C2O4)2(H2O)].nH2O of 0.15 and 0.20 was used, in relation of glycerin and citric acid, employed in the sol-gel production.Muitos setores industriais têm a necessidade de empregar materiais metálicos, com a intenção de promover o uso de equipamentos e estruturas mais eficientes e sustentáveis. Quanto a aplicação, o alumínio pode ser utilizado, proporcionando características como: leveza, resistência mecânica, condutividade elétrica e resistência à corrosão. Para se aumentar a durabilidade do alumínio, o processo de anodização é o mais empregado. Os corantes, também são muito utilizados no alumínio anodizado, pois conferem uma camada mais aderente, promovendo maior versatilidade, proteção à corrosão e embelezamento ao material metálico. Em ambientes muito agressivos, como atmosferas ácidas ou contendo íons cloreto, torna- se necessário um revestimento de proteção mais eficiente. O complexo amoniacal de nióbio (NH4[NbO(C2O4)2(H2O)].nH2O) tem sido utilizado como aditivo nos revestimentos, para melhorar a sua resistência nestes ambientes agressivos. Este trabalho tem como objetivo principal desenvolver tratamentos de superfície com complexo de nióbio amoniacal, para a liga de alumínio AA5052, anodizada, com e sem coloração. Utilizou-se o planejamento experimental, associado as seguintes técnicas: anodização, polarização potenciodinâmica anódica, espectroscopia de fluorescência de raios X, difratometria de raios X, microscopia eletrônica de varredura, espectroscopia por energia dispersiva de raios X, microscopia óptica, espectroscopia de impedância eletroquímica e microscopia Raman. Os resultados eletroquímicos apresentaram elevada resistência a polarização (Rp) em Na2SO4 0,5 mol L-1, pH 4, para o alumínio anodizado, em densidade de corrente (j) da ordem de 10 mA cm-2 e tempo (t) de 20 minutos de anodização. No processo de coloração, obteve-se duas condições aperfeiçoadas: (1) t = 10 minutos e concentração do corante ([C]) = 2,0 gL -1 e (2) t = 20 minutos e [C] = 1,0 g L-1. Esses resultados levam a indústria à economicidade, seja energética ou de materiais de produção. A inserção do complexo amoniacal de nióbio no alumínio anodizado, foi aplicado utilizando-se a técnica de sol- gel, seguida de tratamento térmico da superfície metálica a 350°C e 450°C, sem e com rampa de aquecimento de 10°C min-1. As amostras de alumínio tratadas a 450°C, permitiram a inserção do corante amarelo tartrazina, assim promoveu-se a melhoria da proteção à corrosão e um embelezamento da superfície metálica (colorida). As amostras tratadas a 350°C, sem rampa de aquecimento, mostraram elevada resistência à corrosão localizada (pites) em sistemas contendo NaCl 0,5 mol L-1. Essa resistência refere-se a não existência de potencial de pites, em todo o trecho anódico eletroquímico estudado, quando se utilizou a razão molar do NH4[NbO(C2O4)2(H2O)].nH2O de 0,15 e 0,20 em relação ao precursores glicerina e ácido cítrico, utilizado na produção do sol-gel.Submitted by Fabiano Jucá (fjuca@unicentro.br) on 2021-04-28T16:55:02Z No. of bitstreams: 1 Tese GUILHERME JOSÉ TURCATEL ALVES.pdf: 6897044 bytes, checksum: fcd485879d78a2ea10a9c090a9d70164 (MD5)Made available in DSpace on 2021-04-28T16:55:02Z (GMT). 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dc.title.por.fl_str_mv TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO
title TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO
spellingShingle TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO
Alves, Guilherme José Turcatel
sol-gel
Pechini
inibidor de pites
nanoporos
corrosão
sol-gel
Pechini
pitting inhibitor
nanopores
corrosion
CIENCIAS EXATAS E DA TERRA::QUIMICA
title_short TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO
title_full TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO
title_fullStr TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO
title_full_unstemmed TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO
title_sort TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO
author Alves, Guilherme José Turcatel
author_facet Alves, Guilherme José Turcatel
author_role author
dc.contributor.advisor1.fl_str_mv Rodrigues, Paulo Rogério Pinto
dc.contributor.advisor1Lattes.fl_str_mv http://lattes.cnpq.br/1559766893291724
dc.contributor.authorID.fl_str_mv 043.657.839-55
dc.contributor.authorLattes.fl_str_mv http://lattes.cnpq.br/5917871102224665
dc.contributor.author.fl_str_mv Alves, Guilherme José Turcatel
contributor_str_mv Rodrigues, Paulo Rogério Pinto
dc.subject.por.fl_str_mv sol-gel
Pechini
inibidor de pites
nanoporos
corrosão
topic sol-gel
Pechini
inibidor de pites
nanoporos
corrosão
sol-gel
Pechini
pitting inhibitor
nanopores
corrosion
CIENCIAS EXATAS E DA TERRA::QUIMICA
dc.subject.eng.fl_str_mv sol-gel
Pechini
pitting inhibitor
nanopores
corrosion
dc.subject.cnpq.fl_str_mv CIENCIAS EXATAS E DA TERRA::QUIMICA
description Many industrial sectors need to use metallic materials with the intention of promoting the use of more efficient and sustainable equipment and structures. As application, aluminum can be used providing characteristics such as: lightness, mechanical resistance, electrical conductivity and corrosion resistance. To increase the aluminum durability, the anodizing process is the most used. Dyes are also widely used in anodized aluminum because they provide a more adherent layer, promoting greater versatility, corrosion protection and embellishment to the metallic material. In very aggressive environments, such as acidic or chloride-containing atmospheres, a more efficient protective coating is required. The ammoniacal niobium complex (NH4[NbO(C2O4)2(H2O)].nH2O) has been used as an additive in coatings to improve their resistance in these environments. This work has as main objective to develop surface treatments with ammoniacal niobium complex, for the aluminum alloy AA5052, anodized, with and without coloration. It was used the experimental design, associated with the following techniques: anodization, anodic potentiodynamic polarization, X-ray fluorescence spectroscopy, X-ray diffractometry, scanning electron microscopy, X-ray dispersive energy spectroscopy, optical microscopy, electrochemical impedance spectroscopy and Raman microscopy. The electrochemical results showed high polarization resistance (Rp) in 0.5 mol L-1 Na2SO4, pH 4, for anodized aluminum, at current density (j) in the order of 10 mA cm-2 and anodizing time (t) of 20 minutes. In the coloring process, two improved conditions were obtained: (1) t = 10 minutes and dye concentration ([C]) = 2.0 g L-1 and (2) t = 20 minutes and [C] = 1.0 g L-1. These results lead industry to economy, with reducing the use of energy or production materials. The insertion of the ammoniacal niobium complex on the anodized aluminum was applied using the sol-gel technique, followed by heat treatment of the metal surface at 350°C and 450°C without and with a heating ramp of 10°C min-1. The aluminum samples treated at 450°C allowed the tartrazine yellow dye to be inserted, thus improving corrosion protection and a metallic surface embellishment (colored). Samples treated at 350°C, without heating ramp, showed high resistance to localized corrosion (pitting) in systems containing 0.5 mol L-1 NaCl. This resistance refers to the non-existence of pitting potential throughout the electrochemical anodic section studied, when the molar ratio of NH4[NbO(C2O4)2(H2O)].nH2O of 0.15 and 0.20 was used, in relation of glycerin and citric acid, employed in the sol-gel production.
publishDate 2018
dc.date.issued.fl_str_mv 2018-10-26
dc.date.accessioned.fl_str_mv 2021-04-28T16:55:02Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
status_str publishedVersion
dc.identifier.citation.fl_str_mv Alves, Guilherme José Turcatel. TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO. 2018. 145 f. Tese (Programa de Pós-Graduação em Química - Doutorado) - Universidade Estadual do Centro-Oeste, Guarapuava-PR.
dc.identifier.uri.fl_str_mv http://tede.unicentro.br:8080/jspui/handle/jspui/1573
identifier_str_mv Alves, Guilherme José Turcatel. TRATAMENTO DE SUPERFÍCIE A BASE DE NIÓBIO PARA O ALUMÍNIO ANODIZADO COM E SEM COLORAÇÃO. 2018. 145 f. Tese (Programa de Pós-Graduação em Química - Doutorado) - Universidade Estadual do Centro-Oeste, Guarapuava-PR.
url http://tede.unicentro.br:8080/jspui/handle/jspui/1573
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language por
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dc.relation.cnpq.fl_str_mv 1571700325303117195
dc.relation.sponsorship.fl_str_mv 2075167498588264571
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Estadual do Centro-Oeste
dc.publisher.program.fl_str_mv Programa de Pós-Graduação em Química (Doutorado)
dc.publisher.initials.fl_str_mv UNICENTRO
dc.publisher.country.fl_str_mv Brasil
dc.publisher.department.fl_str_mv Unicentro::Departamento de Ciências Exatas e de Tecnologia
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