Avaliação eletroquímica não destrutiva de sistemas de proteção contra corrosão submetidos a ensaios de envelhecimento acelerado: uma estratégia para a conservação de ligas metálicas do México colonial
DOI:
https://doi.org/10.14568/cp26340Palavras-chave:
Revestimentos protetores, Latão, Ferro fundido, EIS, FTIR, SEMResumo
Neste estudo utilizamos a Espectroscopia de Impedância Eletroquímica (EIS) para avaliar a capacidade protetora de diferentes tratamentos de conservação, nomeadamente: benzotriazol, ácido tânico e revestimento de poliuretano. Os tratamentos foram aplicados em provetes corroídos que replicam latão colonial mexicano e ligas de ferro fundido submetidas a um processo de envelhecimento acelerado sob ciclos de exposição UVB/condensação. A análise eletroquímica foi complementada com medidas colorimétricas e FTIR para obter informações sobre o nível estrutural antes e após o envelhecimento. Os resultados do EIS indicam que, embora os sistemas inibidores previnam a corrosão nos estágios iniciais do envelhecimento, após 600 h os inibidores degradam-se e os produtos do processo de corrosão são formados, resultando numa baixa capacidade de proteção. O revestimento de poliuretano selecionado proporcionou grande capacidade de proteção (EIS), coincidente com os resultados obtidos por FTIR, por não apresentar degradação química ou mudanças na coloração. Esta investigação foi realizada com uma metodologia que pode ser replicada no local por ser não destrutiva, e os dados obtidos podem ser empregues para o planeamento de estratégias de conservação.
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