On the corrosion mechanism of Mg investigated by electrochemical impedance spectroscopy
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Electrochimica Acta
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This work reported a detailed analysis of the electrochemical impedance spectra obtained for the Mg
electrode during immersion in a sodium sulfate solution. A model was proposed which took into account
the presence of: (i) a thin oxide film (MgO) which progressively covered the Mg electrode surface, (ii)
film-free areas where the Mg dissolution occurs in two consecutive steps, (iii) a thick layer of corrosion
products (Mg(OH)2), (iv) an adsorbed intermediate ðMgþ
ads
Þ which is responsible for the chemical reaction
allowing the negative difference effect to be explained. From the impedance data analysis, various
parameters were extracted such as the thin oxide film thickness, the resistivity at the metal/oxide film
interface and at the oxide film/electrolyte interface, the active surface area as a function of the exposure
time to the electrolyte, the thickness of the thick Mg(OH)2 layer and the kinetic constants of the electrochemical
reaction.
Como referenciar
GOMES, MAURILIO P.; COSTA, ISOLDA; PEBERE, NADINE; ROSSI, JESUALDO L.; TRIBOLLET, BERNARD; VIVIER, VINCENT. On the corrosion mechanism of Mg investigated by electrochemical impedance spectroscopy. Electrochimica Acta, v. 306, p. 61-70, 2019. DOI: 10.1016/j.electacta.2019.03.080. Disponível em: http://repositorio.ipen.br/handle/123456789/30015. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.