Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas

Detalhes bibliográficos
Autor(a) principal: Leite, Adriana de Oliveira Sousa
Data de Publicação: 2004
Tipo de documento: Tese
Idioma: por
Título da fonte: Repositório Institucional da Universidade Federal do Ceará (UFC)
Texto Completo: http://www.repositorio.ufc.br/handle/riufc/1022
Resumo: This work describes the development and study of environmental friendly epoxies anticorrosives paints, which were formulated using zinc phosphate (ZP), zinc molybdate (ZM), zinc and calcium molybdate (ZCM), zinc phosphomolybdate (ZMP) and zinc and calcium phosphomolybdate (MZAP), as safe alternative to more traditional anticorrosive pigments (lead, chromium and other heavy metals). Additionally, environmental considerations are limiting the use of solvent-borne paints because it contibutes to atmospheric pollution and empairs health problems. Thus, hydrosoluble epoxy resin was used in the formulation of the water-borne paints. The aim od this research is to employ molybdate-based pigments in order to check their efficiency in water borne paints. Inhibitive properties of the pigments were evaluated by potentiodynamic polarization curves, open ciricuit potential (Eoc) and mass loss monitoring during 30 days in immersion test of SAE 1010 steel in aqueous saturated pigment solutions with 10-2 mol dm-3 NaCl. The physical chemical characterization of the corrosion products was carried out by scanning electron microscopy, energy dispersive X-ray and X-ray diffraction techniques. All the tests showed that the phosphomolybdate pigments presented the better corrosion inhibiting properties. All the paints were formulated with 16% (v/v) epoxy resin, 7.5 % (v/v) anticorrosive pigment, and additives and fillers in order to maintain the PVC/CPVC ration equal to 0.8. the dry thickness of the painted samples was approximately 120 μm. The paint performance was monitored by electrochemical impedance spectroscopy (EIS) during immersion tests, of the atmospheric exposition and accelerated ensay of salt spray. The thermal stability of the paintings was also studied by thermal gravimetry and differential scanning calorimetry. The impedance diagrams of all painted samples showed only one capacitive loop, with impedance values higher than 109 Ωcm2. Capacitance values varied between 10-6 and 10-10 Fcm-2. The results suggest that the combination of the molybdate and phosphate gives the best inhibitive properties. About the thermal analyses were observed that the molybdates and phosphomolybdates pigments showed the better performances thus in the thermal stability of epoxy resin, because theses pigments showed higher interaction between pigment-resin; just as in the relation the energy involved in the cure process of polymeric film, because these pigments contribued to reduce the heat involved in the cure process
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spelling Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretasDevelopment and studies of environmental friendly epoxies anticorrosive paintsCorrosãoAnticorrosivosTintasQuímica inorgânicaThis work describes the development and study of environmental friendly epoxies anticorrosives paints, which were formulated using zinc phosphate (ZP), zinc molybdate (ZM), zinc and calcium molybdate (ZCM), zinc phosphomolybdate (ZMP) and zinc and calcium phosphomolybdate (MZAP), as safe alternative to more traditional anticorrosive pigments (lead, chromium and other heavy metals). Additionally, environmental considerations are limiting the use of solvent-borne paints because it contibutes to atmospheric pollution and empairs health problems. Thus, hydrosoluble epoxy resin was used in the formulation of the water-borne paints. The aim od this research is to employ molybdate-based pigments in order to check their efficiency in water borne paints. Inhibitive properties of the pigments were evaluated by potentiodynamic polarization curves, open ciricuit potential (Eoc) and mass loss monitoring during 30 days in immersion test of SAE 1010 steel in aqueous saturated pigment solutions with 10-2 mol dm-3 NaCl. The physical chemical characterization of the corrosion products was carried out by scanning electron microscopy, energy dispersive X-ray and X-ray diffraction techniques. All the tests showed that the phosphomolybdate pigments presented the better corrosion inhibiting properties. All the paints were formulated with 16% (v/v) epoxy resin, 7.5 % (v/v) anticorrosive pigment, and additives and fillers in order to maintain the PVC/CPVC ration equal to 0.8. the dry thickness of the painted samples was approximately 120 μm. The paint performance was monitored by electrochemical impedance spectroscopy (EIS) during immersion tests, of the atmospheric exposition and accelerated ensay of salt spray. The thermal stability of the paintings was also studied by thermal gravimetry and differential scanning calorimetry. The impedance diagrams of all painted samples showed only one capacitive loop, with impedance values higher than 109 Ωcm2. Capacitance values varied between 10-6 and 10-10 Fcm-2. The results suggest that the combination of the molybdate and phosphate gives the best inhibitive properties. About the thermal analyses were observed that the molybdates and phosphomolybdates pigments showed the better performances thus in the thermal stability of epoxy resin, because theses pigments showed higher interaction between pigment-resin; just as in the relation the energy involved in the cure process of polymeric film, because these pigments contribued to reduce the heat involved in the cure processEsse trabalho é o início de uma nova linha de pesquisa do laboratório de eletroquímica da UFC que busca desenvolver tintas com alternativas de utilização de pigmentos tóxicos e matérias-primas ditas ecologicamente corretas. Neste sentido este trabalho descreve o desenvolvimento e estudo de tintas ecologicamente corretas formuladas usando fosfato de zinco (ZP), molibdato de zinco (ZM), molibdato de zinco e cálcio (ZCM), fosfomolibdato de zinco (ZMP) e fosfomolibdato de zinco e cálcio (ZCMP), como alternativas seguras aos pigmentos anticorrosivos tradicionais (chumbo, cromo e outros metais pesados). Adicionalmente, considerações ambientais têm limitado o uso de tintas organossolúveis devido estas contribuírem para a poluição atmosférica e problemas de saúde. Assim, resinas epóxis hidrossolúveis foram usadas na formulação das tintas epóxis anticorrosivas. O principal objetivo deste trabalho é empregar pigmentos de molibdatos para avaliar sua eficiência contra corrosão em tintas hidrossolúveis. As propriedades inibidoras dos pigmentos foram avaliadas por curvas de polarização potenciodinâmica, monitoramento do potencial de circuito aberto e perda de massa por imersão de substratos ferrosos (SAE 1010) em solução saturada dos pigmentos em 10-2 mol dm-3 NaCl. A caracterização físico-química dos produtos de corrosão foi avaliada por microscopia eletrônica de varredura, energia dispersiva de raios-X e difração de raios-X. Todos os testes mostraram que os pigmentos fosfomolibdatos apresentaram as melhores propriedades inibidoras de corrosão. Todas as tintas foram formuladas com 16% (v/v) de resina epóxi, 7,5% (v/v) de pigmentos anticorrosivos, e demais componentes e aditivos para manter a relação de PVC/CPVC em 0,8. A espessura da película seca de tinta nos painéis ficou em aproximadamente 120 μm. O desempenho das tintas foi monitorado por impedância eletroquímica durante os testes de imersão, de exposição atmosférica e de câmara acelerado de névoa salina. A estabilidade térmica foi estudada por análise térmica e calorimetria exploratória diferencial. Os diagramas de impedância de todas as tintas mostraram somente um arco capacitivo, com os valores de impedância maiores que 109 Ωcm2. os valores de capacitância variaram entre 10-6 e 10-10 Fcm-2. Os resultados sugerem que a combinação do molibdato e fosfato fornecem as melhores propriedades inibidoras às tintas. Em relação às análises térmicas foi possível concluir que os pigmentos de molibdatos e fosfomolibdatos apresentaram o melhor desempenho tanto em relação à estabilidade térmica da resina epóxi, uma vez que estes pigmentos mostraram maior interação entre pigmento-resina, assim como em relação à energia envolvida no processo de cura do filme polimérico, pois estes pigmentos demonstraram que contribuem para a diminuição do calor envolvido no processo de cura.Lima Neto, Pedro deLeite, Adriana de Oliveira Sousa2011-11-01T17:28:45Z2011-11-01T17:28:45Z2004info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfLEITE, A. O. S. Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas. 2004. 168 f. Tese (Doutorado em Química Inorgânica ) – Universidade Federal do Ceará, Fortaleza, 2004.http://www.repositorio.ufc.br/handle/riufc/1022porreponame:Repositório Institucional da Universidade Federal do Ceará (UFC)instname:Universidade Federal do Ceará (UFC)instacron:UFCinfo:eu-repo/semantics/openAccess2020-06-25T12:48:51Zoai:repositorio.ufc.br:riufc/1022Repositório InstitucionalPUBhttp://www.repositorio.ufc.br/ri-oai/requestbu@ufc.br || repositorio@ufc.bropendoar:2024-09-11T18:18:15.304486Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC)false
dc.title.none.fl_str_mv Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas
Development and studies of environmental friendly epoxies anticorrosive paints
title Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas
spellingShingle Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas
Leite, Adriana de Oliveira Sousa
Corrosão
Anticorrosivos
Tintas
Química inorgânica
title_short Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas
title_full Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas
title_fullStr Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas
title_full_unstemmed Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas
title_sort Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas
author Leite, Adriana de Oliveira Sousa
author_facet Leite, Adriana de Oliveira Sousa
author_role author
dc.contributor.none.fl_str_mv Lima Neto, Pedro de
dc.contributor.author.fl_str_mv Leite, Adriana de Oliveira Sousa
dc.subject.por.fl_str_mv Corrosão
Anticorrosivos
Tintas
Química inorgânica
topic Corrosão
Anticorrosivos
Tintas
Química inorgânica
description This work describes the development and study of environmental friendly epoxies anticorrosives paints, which were formulated using zinc phosphate (ZP), zinc molybdate (ZM), zinc and calcium molybdate (ZCM), zinc phosphomolybdate (ZMP) and zinc and calcium phosphomolybdate (MZAP), as safe alternative to more traditional anticorrosive pigments (lead, chromium and other heavy metals). Additionally, environmental considerations are limiting the use of solvent-borne paints because it contibutes to atmospheric pollution and empairs health problems. Thus, hydrosoluble epoxy resin was used in the formulation of the water-borne paints. The aim od this research is to employ molybdate-based pigments in order to check their efficiency in water borne paints. Inhibitive properties of the pigments were evaluated by potentiodynamic polarization curves, open ciricuit potential (Eoc) and mass loss monitoring during 30 days in immersion test of SAE 1010 steel in aqueous saturated pigment solutions with 10-2 mol dm-3 NaCl. The physical chemical characterization of the corrosion products was carried out by scanning electron microscopy, energy dispersive X-ray and X-ray diffraction techniques. All the tests showed that the phosphomolybdate pigments presented the better corrosion inhibiting properties. All the paints were formulated with 16% (v/v) epoxy resin, 7.5 % (v/v) anticorrosive pigment, and additives and fillers in order to maintain the PVC/CPVC ration equal to 0.8. the dry thickness of the painted samples was approximately 120 μm. The paint performance was monitored by electrochemical impedance spectroscopy (EIS) during immersion tests, of the atmospheric exposition and accelerated ensay of salt spray. The thermal stability of the paintings was also studied by thermal gravimetry and differential scanning calorimetry. The impedance diagrams of all painted samples showed only one capacitive loop, with impedance values higher than 109 Ωcm2. Capacitance values varied between 10-6 and 10-10 Fcm-2. The results suggest that the combination of the molybdate and phosphate gives the best inhibitive properties. About the thermal analyses were observed that the molybdates and phosphomolybdates pigments showed the better performances thus in the thermal stability of epoxy resin, because theses pigments showed higher interaction between pigment-resin; just as in the relation the energy involved in the cure process of polymeric film, because these pigments contribued to reduce the heat involved in the cure process
publishDate 2004
dc.date.none.fl_str_mv 2004
2011-11-01T17:28:45Z
2011-11-01T17:28:45Z
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.uri.fl_str_mv LEITE, A. O. S. Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas. 2004. 168 f. Tese (Doutorado em Química Inorgânica ) – Universidade Federal do Ceará, Fortaleza, 2004.
http://www.repositorio.ufc.br/handle/riufc/1022
identifier_str_mv LEITE, A. O. S. Desenvolvimento e estudos de tintas epóxis anticorrosivas ecologicamente corretas. 2004. 168 f. Tese (Doutorado em Química Inorgânica ) – Universidade Federal do Ceará, Fortaleza, 2004.
url http://www.repositorio.ufc.br/handle/riufc/1022
dc.language.iso.fl_str_mv por
language por
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.source.none.fl_str_mv reponame:Repositório Institucional da Universidade Federal do Ceará (UFC)
instname:Universidade Federal do Ceará (UFC)
instacron:UFC
instname_str Universidade Federal do Ceará (UFC)
instacron_str UFC
institution UFC
reponame_str Repositório Institucional da Universidade Federal do Ceará (UFC)
collection Repositório Institucional da Universidade Federal do Ceará (UFC)
repository.name.fl_str_mv Repositório Institucional da Universidade Federal do Ceará (UFC) - Universidade Federal do Ceará (UFC)
repository.mail.fl_str_mv bu@ufc.br || repositorio@ufc.br
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