Electrochemical impedance spectroscopy and potentiodynamic polarization studies affected by the microstructure array of a monotectic al-pb alloy in a nacl solution

Wislei R. Osório; Emmanuelle S. Freitas; Amauri Garcia

Electrochemical impedance spectroscopy and potentiodynamic polarization studies affected by the microstructure array of a monotectic al-pb alloy in a nacl solution

Wislei R. Osório, Emmanuelle S. Freitas, Amauri Garcia

Material

ARTIGO

Idioma

Inglês

Nota geral

Agradecimentos: The authors acknowledge the financial support provided by FAEPEX-UNICAMP, CNPq (The Brazilian Research Council) and FAPESP (São Paulo Research Foundation‚ grant nos. 2013/15478-3 and 2013/23396-7)

Resumo In this study, electrochemical impedance spectroscopy (EIS) plots and potentiodynamic polarization curves of tests carried out with monotectic Al-Pb alloy samples in a 0.5 Molar sodium chloride (NaCl) solution at 25°C are evaluated. It is shown that for a microstructure characterized by immiscible... Ver mais In this study, electrochemical impedance spectroscopy (EIS) plots and potentiodynamic polarization curves of tests carried out with monotectic Al-Pb alloy samples in a 0.5 Molar sodium chloride (NaCl) solution at 25°C are evaluated. It is shown that for a microstructure characterized by immiscible Pb droplets disseminated into an Al matrix, the microstructural array and segregation pattern are the corrosion driving forces. Microstructures characterized by Pb droplets of higher diameter and more homogeneously distributed into the Al-matrix, typical of positions close to the casting surface, have lower corrosion resistance. This has been attributed to a higher anode/cathode area that characterizes such microstructures and that, as a consequence, induces a higher number of galvanic couples that are formed between the Pb droplets and the Al matrix Ver menos

Nota de informação sobre financiamento

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

2013/15478-3; 2013/23396-7

Direito de acesso

Fechado

Assuntos

Solidificação

Microestrutura

Ligas (Metalurgia)

Corrosão

Artigo original

Autoria

Osório, Wislei Riuper Ramos, 1974- Autor

Freitas Feitosa, Emmanuelle Sá, 1980- Autor

Garcia, Amauri, 1949- Autor

Sites

DOI: https://doi.org/10.5006/1293

Texto completo: https://corrosionjournal.org/doi/abs/10.5006/1293

Electrochemical impedance spectroscopy and potentiodynamic polarization studies affected by the microstructure array of a monotectic al-pb alloy in a nacl solution

Wislei R. Osório, Emmanuelle S. Freitas, Amauri Garcia

Electrochemical impedance spectroscopy and potentiodynamic polarization studies affected by the microstructure array of a monotectic al-pb alloy in a nacl solution

Wislei R. Osório, Emmanuelle S. Freitas, Amauri Garcia

Fontes

Corrosion Vol. 70, no. 10 (Oct., 2014), p. 1031-1042

Terminal de consulta web

Electrochemical impedance spectroscopy and potentiodynamic polarization studies affected by the microstructure array of a monotectic al-pb alloy in a nacl solution

Electrochemical impedance spectroscopy and potentiodynamic polarization studies affected by the microstructure array of a monotectic al-pb alloy in a nacl solution

Electrochemical impedance spectroscopy and potentiodynamic polarization studies affected by the microstructure array of a monotectic al-pb alloy in a nacl solution

Fontes