Closure to “Discussion of ‘Corrosion of Anodically and Cathodically Polarized Magnesium in Aqueous Media’ [G. R. Hoey and M. Cohen (pp. 245–250, Vol. 105)]”

Hoey, G. R.; Cohen, Morris

doi:10.1149/1.2428729

Cited by 24 publications

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“…Other studies have been made of associated thermodynamics (4) and kinetics and transport processes (5)(6)(7)(8)(9). Magnesium corrosion is highly hindered by surface hydroxide (8) and the mixed potential for dissolution is generally about one volt positive to the reversible potential of magnesium.…”

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confidence: 99%

Corrosion of Magnesium at High Anodic Potentials

Beck

Chan

1983

J. Electrochem. Soc.

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During the pitting of magnesium and other metals in halide solutions.a film of halide salt of the metal forms on the corroding surface. This @&it film plays a major role as a diffusion barrier for water and prevents repassivation by oxide. Properties of magnesium chloride layers were determined on corroding high-purity magnesium shielded electrodes or one-dimensional pits. Electrical transient experiments showed that the salt film thickness is proportional to applied anodic potential and that conduction is by the high field mechanism. Water diffusion rate decreases with film thickness.

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confidence: 99%

Corrosion of Magnesium at High Anodic Potentials

Beck

Chan

1983

J. Electrochem. Soc.

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“…The chunk effect ratio C, calculated from either Eq. [11] or [12], showed a gradual increase, with a reasonably good fit of values obtained by the two methods.…”

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confidence: 66%

Erratum: “Theory of Faradaic Distortion” [J. Electrochem. Soc., 107, 768 (September 1960)]

Oldham¹

1960

J. Electrochem. Soc.

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“…La dissolution anodique du magnesium s'accompagne d'un degagement d'hydrogene qui consomme une fraction des electrons liberes (18)(19)(20)(21)(22)(23)(24). Ceci se traduit par un faible rendement faradaique des anodes de Mg generalement observe.…”

Section: Introductionunclassified

“…I1 comporte la formation initiale d'un intermediaire: I'ion de magnesium monovalent (Mg+) (23,24) ou le dihydrure de Mg (25,26). La reaction ulterieure de cet intermediaire avec la solution generent les electrons qui servent au degagement de I'hydrogene (23)(24)(25)(26). Par contre, un dernier groupe de chercheurs (27)(28)(29)(30)(31)(32)(33)(34)) attribue au phenomene de desintegration de l'anode, la surconsommation de metal tandis qu'ils soutiennent que le degagement d'hydrogene resulte de la reaction de ces particules avec la solution.…”

Section: Introductionunclassified

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Le comportement électrochimique du magnésium en milieux légèrement alcalins

Brossard¹,

Piron²

1980

Can. J. Chem.

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Le comportement electrochimique du magnesium en milieux legerement alcalins ROBERT-Lours BROSSARDCentre de Recherchrs pour la Defense, Otta,t,a, Otzt., Cette etude a condult a I'elaboration d'un modele qui permet d'expliquer le comportement anodique du magnesium sans faire appel a la formation d'intermediaires. Ce modele lie etroitement les caracteristiques du comportement anodique aux proprietes du produit de corrosion qui se voit traverse par un reseau d e pores dans toute son epaisseur. L e courant et I'hydrogene gazeux circulent par les pores tandis que la nature poreuse de ce film explique qu'il soit faiblement protecteur. Par ailleurs. la surconsommation de magnesium qu'entraine le degagement d'hydrogene s'explique a partir de la dissolution de fines particules de magnesium prisonnieres dans le produit de corrosion. De plus, I'activation de I'electrode des le retour a I'abandon est attribue a la mise a nu du metal a I'extremite des pores durant la dissolution anodique.Enfin. la substitution des chlorures par les sulfates comme electrolyte n'affecte nullement la valeur de la tension corrigee de I'anode pour la chute ohmique qui demeurc constantc a -1.65 V (1E.C.S.) approximativement. ROBERT-LOUIS BROSSARD and D O M I~I Q U E -L O U I SP I R O~. Can. J . Chem. 58,30(1980). This study of the anodic behavior of magnesium in simulated seawater has shown that the corrosion product formed at the surface of the electrode depends mainly on the nature of ions dissolved in the electrolyte. Analyses of the corrosion product, formed in the presence of a high concentration of chloride ions. are compatible with the formation of a compound having approximately the formula 5Mg(OH),.MgCI,. However, this complex is gradually transformed over a period of several hours into Mg(OH),.A model of the oxidation mechanism is presented in which the characteristics of the anodic behavior of magnesium are related to the structure of the oxidation layer. For example, the activation of the surface of the anode, the kinetics of the hydrogen evolution reaction. and the large difference between values of corrected and uncorrected electrode potential can all be explained by this model. It is the resistance of the film to the flow of current which controls the kinetics of anodic dissolution of magnesium.

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Closure to “Discussion of ‘Corrosion of Anodically and Cathodically Polarized Magnesium in Aqueous Media’ [G. R. Hoey and M. Cohen (pp. 245–250, Vol. 105)]”

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Cited by 24 publications

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Corrosion of Magnesium at High Anodic Potentials

Corrosion of Magnesium at High Anodic Potentials

Erratum: “Theory of Faradaic Distortion” [J. Electrochem. Soc., 107, 768 (September 1960)]

Le comportement électrochimique du magnésium en milieux légèrement alcalins

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