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Localized approach to galvanic coupling in an aluminum–magnesium system

Lacroix, Loïc and Blanc, Christine and Pébère, Nadine and Tribollet, Bernard and Vivier, Vincent Localized approach to galvanic coupling in an aluminum–magnesium system. (2009) Journal of The Electrochemical Society (JES), vol. 156 (n° 8). C259-C265. ISSN 0013-4651

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Official URL: http://dx.doi.org/10.1149/1.3148833

Abstract

The corrosion behavior of a pure aluminum/pure magnesium couple in a weakly conductive sodium sulfate solution was investigated. Potential and current distributions on the surface of the model couple at the beginning of immersion were obtained by solving the Laplace equation using a finite element method algorithm. Magnesium acted as the anode of the system while oxygen and water were reduced on aluminum. Calculations predicted a large current peak at the Al/Mg interface related to a local increase in both Mg dissolution and oxygen and water reduction on aluminum, leading to a local pH increase. Optical and scanning electron microscope observations confirmed the strong dissolution of magnesium concomitantly with depassivation of aluminum at the Al/Mg interface. Local electrochemical impedance spectroscopy showed the detrimental effects of the galvanic coupling both on aluminum and magnesium.

Item Type:Article
Additional Information:Thanks to Electrochemical Society editor. The definitive version is available at http://www.electrochem.org/ The original PDF of the article can be found at Journal of The Electrochemical Society website : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=ECSTF8000016000052000025000001&idtype=cvips&gifs=yes&ref=no
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > Université Pierre et Marie Curie, Paris 6 - UPMC (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Nihad Lahdifi

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