Revestimento de Bicamada de Polipirrol  Dopada com Ácido Fosfórico e Ácido  Salicílico e sua Eficiência para Proteção do  Aço Carbono contra Corrosão

Luciano  G. Guiotti; Diogo  M.  L. Santos; Andrea  S. Liu; Liu  Y. Cho

doi:10.19142/rpq.v17i34.702

Luciano G. Guiotti Universidade do Vale do Paraíba, São José dos Campos https://orcid.org/0000-0002-9225-7262
Diogo M. L. Santos Universidade do Vale do Paraíba, São José dos Campos https://orcid.org/0000-0001-8387-9281
Andrea S. Liu Universidade do Vale do Paraíba, São José dos Campos https://orcid.org/0000-0001-9093-0866
Liu Y. Cho Universidade do Vale do Paraíba, São José dos Campos https://orcid.org/0000-0001-5366-5784

DOI: https://doi.org/10.19142/rpq.v17i34.702

Palavras-chave: polipirrol, acetonitrila, bicamada, corrosão, aço carbono

Resumo

Neste trabalho, um revestimento constituído por bicamada de polipirrol foi sintetizado eletroquimicamente em acetonitrila sobre a superfície de aço carbono. Utilizou-se ácido fosfórico e ácido salicílico como dopantes das camadas interna e externa, respectivamente. A morfologia do revestimento foi investigada por microscopia eletrônica de varredura e indicou a formação de uma superfície homogênea e compacta. A composição do revestimento foi analisada por espectroscopia de infravermelho (FTIR) e indicou a presença de bandas características do polipirrol e dos dopantes. A eficiência de proteção contra corrosão do aço carbono foi avaliada por ensaios eletroquímicos de potencial de circuito aberto e de polarização potenciodinâmica, em meio agressivo de cloreto. Verificou-se um deslocamento do potencial de corrosão para a direção positiva e menores densidades de corrente anódicas para a superfície de aço carbono revestida com a bicamada de polipirrol em relação ao metal sem revestimento, indicando proteção da superfície metálica contra corrosão. Ademais, a morfologia do revestimento se manteve íntegra e sem falhas mesmo após o ensaio de polarização potenciodinâmica.

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