On the corrosion mechanism of Mg investigated by electrochemical impedance spectroscopy

Maurilio Pereira Gomes (1) , Isolda G Costa (1) , Nadine Pébère (2) , Jesualdo Luiz Rossi (1) , Bernard Tribollet (3) , Vincent Vivier (3)

1 IPEN/CNEN-SP - Instituto de Pesquisas Energéticas e Nucleares [São Paulo]
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
3 LISE - Laboratoire Interfaces et Systèmes Electrochimiques

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 Mg #$% & 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.

Mots clés: Magnesium; Oxide film; Power-law model; Negative difference effect (NDE); adsorbed intermediate

Domaines: Chimie

Maurilio Pereira Gomes, Isolda G Costa, Nadine Pébère, Jesualdo Luiz Rossi, Bernard Tribollet, et al.. On the corrosion mechanism of Mg investigated by electrochemical impedance spectroscopy. Electrochimica Acta, 2019, 306, pp.61-70. ⟨10.1016/j.electacta.2019.03.080⟩. ⟨hal-02089747⟩