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Mechanism of hydrogen formation during the corrosion of Mg17Al12

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
hal.structure.identifierLaboratoire de Chimie Physique des Matériaux [LCPM]
hal.structure.identifierPlateforme de Recherche en NanoSciences et NanoTechnologie [PR2N]
dc.contributor.authorAL BACHA, Serge
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorDESMEDT, Arnaud
hal.structure.identifierLaboratoire de Chimie Physique des Matériaux [LCPM]
hal.structure.identifierPlateforme de Recherche en NanoSciences et NanoTechnologie [PR2N]
dc.contributor.authorZAKHOUR, Mirvat
hal.structure.identifierLaboratoire de Chimie Physique des Matériaux [LCPM]
hal.structure.identifierPlateforme de Recherche en NanoSciences et NanoTechnologie [PR2N]
dc.contributor.authorNAKHL, Michel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBOBET, Jean-Louis
dc.date.issued2020-10
dc.identifier.issn1388-2481
dc.description.abstractEnPrevious investigations (DFT calculations) showed that hydrogen atoms adsorption and H 2 desorption can occur on MgO and Al 2 O 3 and that H atoms can diffuse on Mg and Al surfaces. However, these three simultaneous actions, i.e. H adsorption, H diffusion and H 2 desorption, have not been experimentally proved. In this paper, we propose a mechanism of formation of H 2 during the corrosion of an intermetallic compound Mg 17 Al 12 in 3.5 wt. % NaCl aqueous solution based on in situ Raman spectroscopy analysis. We found that, through the passivation zone (e.g. E varying from the open circuit potential (OCP) to +100 mV/OCP), the oxide layer is destroyed in favor of the appearance of Mg and H atoms. Moreover, the formed H atoms are adsorbed on the oxide surface and then diffuse on either the oxide surface or the unreacted metal surface where they recombine forming H 2. In situ Raman measurements during anodic polarization experimentally prove, for the first time, the formation of a reaction intermediate which weakens the H-H bond. The obtained results explain the mechanism of hydrogen production under anodic polarization of the intermetallic compound at normal conditions of temperature and pressure.
dc.language.isoen
dc.publisherElsevier
dc.subject.enHydrogen
dc.subject.enMonovalent Mg
dc.subject.enCorrosion
dc.subject.enMg17Al12
dc.subject.enRaman
dc.subject.enMg+/MgH+
dc.title.enMechanism of hydrogen formation during the corrosion of Mg17Al12
dc.typeArticle de revue
dc.identifier.doi10.1016/j.elecom.2020.106813
dc.subject.halChimie/Matériaux
dc.subject.halChimie/Chimie théorique et/ou physique
dc.subject.halChimie/Autre
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
bordeaux.journalElectrochemistry Communications
bordeaux.page106813 (5 p.)
bordeaux.volume119
bordeaux.peerReviewedoui
hal.identifierhal-03048407
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03048407v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Electrochemistry%20Communications&rft.date=2020-10&rft.volume=119&rft.spage=106813%20(5%20p.)&rft.epage=106813%20(5%20p.)&rft.eissn=1388-2481&rft.issn=1388-2481&rft.au=AL%20BACHA,%20Serge&DESMEDT,%20Arnaud&ZAKHOUR,%20Mirvat&NAKHL,%20Michel&BOBET,%20Jean-Louis&rft.genre=article


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