Journal
ELECTROCHIMICA ACTA
Volume 306, Issue -, Pages 61-70Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.03.080
Keywords
Magnesium; Oxide film; Power-law model; Negative difference effect (NDE); Adsorbed intermediate
Categories
Funding
- FAPESP [2013/13235-6]
- CAPES-Cofecub [806-14, 88881.154406/2017-01]
Ask authors/readers for more resources
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 oMg thorn ads thorn 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. (c) 2019 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available