Avaliação da proteção de folha de flandres com aplicação de diferentes revestimentos internos
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Data
2024-12-05
Autores
Orientador
Borsoi, Cleide
Banca
Catto, André Luís
Hansen, Betina
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Resumo
A folha de flandres abrange grande parte do mercado que necessita de embalagens metálicas. Assim, aplicam-se revestimentos orgânicos, que são capazes não somente de proteger o produto, mas também a embalagem de possíveis degradações, pois a aplicação inadequada de revestimentos orgânicos em folhas de flandres pode causar problemas de corrosão. Essa corrosão aumenta a interação entre os constituintes da embalagem e o produto, o que pode resultar na deterioração da embalagem e ocasionar contaminação do produto pelos metais presentes. Com isso, o objetivo deste trabalho consiste em avaliar o desempenho de três revestimentos orgânicos aplicados à folha de flandres como uma barreira protetora em embalagens metálicas. Para desenvolvimento deste trabalho, foi realizada a aplicação industrial de três diferentes revestimentos orgânicos (epóxi, epóxi-fenólico e esmalte epóxi Vitalute 745 - griss) sobre a folha de flandres, em uma indústria localizada na cidade de Estrela, no Vale do Taquari, RS. Para a avaliação dos revestimentos foram realizados ensaios de cura utilizando o método de dissolução com solvente metil-etil-cetona, ensaios mecânicos como aderência do revestimento, teste de impacto e flexibilidade, além de ensaios de degradação à umidade por 24 horas em câmara úmida saturada de água. Além disso, foi realizada uma avaliação por Microscopia Eletrônica de Varredura (MEV-FEG), Espectroscopia de Energia Dispersiva (EDS) após realização do ensaio eletroquímico através do Potencial de Circuito Aberto (OCP). Os revestimentos analisados apresentaram espessuras uniformes, com o epóxi-fenólico sendo o com a menor espessura e o epóxi, o mais espesso. A avaliação de cura revelou que o epóxi- fenólico apresentou maior perda de espessura em testes de dissolução por solvente, indicando menor resistência ao metil-etil-cetona em comparação aos outros revestimentos. Todos os vernizes atingiram a classificação máxima de adesão, sem trincas ou desplacamentos nos testes de impacto e cunha. A análise de degradação da umidade confirmou a integridade do substrato metálico, enquanto os ensaios eletroquímicos mostraram que o epóxi-fenólico apresentou a melhor resistência à corrosão, embora todos os revestimentos apresentem suscetibilidade à oxidação ao longo do tempo. O esmalte epóxi vitalure 745 - griss, apesar de um potencial de corrosão menos nobre, também demonstrou eficácia na proteção contra a corrosão. Em conclusão, Todos os revestimentos orgânicos analisados mostraram potencial para embalagens de esmaltes, vernizes e tintas à base de água, devendo a escolha considerar o acabamento e as especificidades do produto.
Tinplate encompasses a significant portion of the market that requires metal packaging. Thus, organic coatings are applied, which not only protect the product but also the packaging from potential degradation, as improper application of organic coatings on tinplate can lead to corrosion issues. This corrosion increases the interaction between the packaging components and the product, potentially resulting in the deterioration of the packaging and causing contamination of the product by the metals present. Therefore, the objective of this study is to evaluate the performance of three organic coatings applied to tinplate as a protective barrier in packaging. For this work, industrial application of three different organic coatings (epoxy, epoxy-phenolic, and epoxy varnish Vitalute 745 - Griss) was carried out on tinplate in an industry located in the city of Estrela, in the Vale do Taquari, RS. To evaluate the coatings, curing tests were conducted using the dissolution method with methyl ethyl ketone solvent, mechanical tests such as coating adhesion, impact testing, and flexibility, in addition to moisture degradation tests for 24 hours in a saturated humid chamber. Evaluation was conducted using Scanning Electron Microscopy (SEM-FEG), Energy Dispersive Spectroscopy (EDS) after performing the electrochemical test through Open Circuit Potential (OCP) and polarization curves. The analyzed coatings showed uniform thicknesses, with the epoxy-phenolic being the thinnest and the epoxy being the thickest. The curing evaluation revealed that the epoxy-phenolic exhibited a significant loss of thickness in solvent dissolution tests, indicating lower resistance to methyl ethyl ketone compared to the other coatings, which demonstrated better performance. All varnishes achieved the maximum adhesion rating, with no cracks or delaminations in impact and wedge tests. The moisture degradation analysis confirmed the integrity of the metallic substrate, while the electrochemical tests showed that the epoxy-phenolic had the best corrosion resistance, although both coatings displayed susceptibility to oxidation over time. The epoxy varnish Vitalute 745 - Griss, despite having a less noble potential, also demonstrated effectiveness in protecting against corrosion, even with possible coating flaws. In conclusion, all the evaluated organic coatings have shown great potential for use in packaging for water-based enamels, varnishes, and paints. The choice of the ideal coating should take into account both the desired finish type and the specific characteristics of the product to be packaged.
Tinplate encompasses a significant portion of the market that requires metal packaging. Thus, organic coatings are applied, which not only protect the product but also the packaging from potential degradation, as improper application of organic coatings on tinplate can lead to corrosion issues. This corrosion increases the interaction between the packaging components and the product, potentially resulting in the deterioration of the packaging and causing contamination of the product by the metals present. Therefore, the objective of this study is to evaluate the performance of three organic coatings applied to tinplate as a protective barrier in packaging. For this work, industrial application of three different organic coatings (epoxy, epoxy-phenolic, and epoxy varnish Vitalute 745 - Griss) was carried out on tinplate in an industry located in the city of Estrela, in the Vale do Taquari, RS. To evaluate the coatings, curing tests were conducted using the dissolution method with methyl ethyl ketone solvent, mechanical tests such as coating adhesion, impact testing, and flexibility, in addition to moisture degradation tests for 24 hours in a saturated humid chamber. Evaluation was conducted using Scanning Electron Microscopy (SEM-FEG), Energy Dispersive Spectroscopy (EDS) after performing the electrochemical test through Open Circuit Potential (OCP) and polarization curves. The analyzed coatings showed uniform thicknesses, with the epoxy-phenolic being the thinnest and the epoxy being the thickest. The curing evaluation revealed that the epoxy-phenolic exhibited a significant loss of thickness in solvent dissolution tests, indicating lower resistance to methyl ethyl ketone compared to the other coatings, which demonstrated better performance. All varnishes achieved the maximum adhesion rating, with no cracks or delaminations in impact and wedge tests. The moisture degradation analysis confirmed the integrity of the metallic substrate, while the electrochemical tests showed that the epoxy-phenolic had the best corrosion resistance, although both coatings displayed susceptibility to oxidation over time. The epoxy varnish Vitalute 745 - Griss, despite having a less noble potential, also demonstrated effectiveness in protecting against corrosion, even with possible coating flaws. In conclusion, all the evaluated organic coatings have shown great potential for use in packaging for water-based enamels, varnishes, and paints. The choice of the ideal coating should take into account both the desired finish type and the specific characteristics of the product to be packaged.
Descrição
Palavras-chave
Folha de flandres; Revestimentos orgânicos; Propriedades mecânicas; Corrosão; Tinplate; Organic coatings; Mechanical properties; Corrosion
Citação
ROSENBACH, Guilherme. Avaliação da proteção de folha de flandres com aplicação de diferentes revestimentos internos. 2024. Monografia (Graduação em Engenharia Química) – Universidade do Vale do Taquari - Univates, Lajeado, 05 dez. 2024. Disponível em: http://hdl.handle.net/10737/4691.