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On the stability of the oxides film formed on a magnesium alloy containing rare-earth elements

Abstract : The electrochemical behaviour of a commercial magnesium alloy containing rare-earth elements, the WE43, was investigated by electrochemical techniques in both sulphate and chloride solutions and compared to that of pure magnesium (99.95 wt %). A particular attention was paid to the oxides film that formed during the corrosion process. Electrochemical impedance data analysis allowed the oxides films thickness to be determined. The film was thinner and more protective for the WE43 Mg alloy than for the pure Mg. ToF-SIMS analysis showed the incorporation of alloying elements, mainly yttrium and zirconium in the corrosion products layer. A higher compactness due to a higher Pilling-Bedworth ratio can explain the electrochemical results.
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https://hal.archives-ouvertes.fr/hal-01880762
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Submitted on : Tuesday, September 25, 2018 - 10:52:32 AM
Last modification on : Wednesday, November 18, 2020 - 3:18:02 PM
Long-term archiving on: : Wednesday, December 26, 2018 - 2:06:23 PM

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Samuel Leleu, Bertrand Rives, Jérôme Bour, Nicolas Causse, Nadine Pébère. On the stability of the oxides film formed on a magnesium alloy containing rare-earth elements. Electrochimica Acta, Elsevier, 2018, 290, pp.586-594. ⟨10.1016/j.electacta.2018.08.093⟩. ⟨hal-01880762⟩

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