The electrochemical corrosion of pure magnesium in 1 N NaCl

Song, Guang‐Ling; Atrens, Andrej; StJohn, David H.; Nairn, J.; Li, Y.

doi:10.1016/s0010-938x(96)00172-2

Cited by 560 publications

(337 citation statements)

References 9 publications

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“…Song et al [16,17] showed that the corrosion of pure Mg in chloride and sulphate solutions involved a partially protective film, and furthermore that there was increasing film breakdown with anodic polarisation from the open circuit potential, particularly in chloride solutions. Thus, it is expected [16,17,18] that the anodic current density, for an applied potential E, under conditions at which the cathodic partial reaction can be neglected, is given by…”

Section: Discussionmentioning

confidence: 99%

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Low apparent valence of Mg during corrosion

et al. 2014

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Our recent data on Mg corrosion has been reanalysed because of the recent criticism that our previous data analysis was inadequate. Re-analysis leads to similar conclusions as previously. The apparent valence of Mg during corrosion was in each case less than 2.0, and in many cases less than 1.0. Moreover, these values were probably over-estimates. The low values were consistent with the evolving hydrogen gas acting as an insulator, so that the corrosion of parts of the specimen could occur isolated from the electrochemical measurement system.

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Section: Discussionmentioning

confidence: 99%

“…Thus, it is expected [16,17,18] that the anodic current density, for an applied potential E, under conditions at which the cathodic partial reaction can be neglected, is given by…”

Section: Discussionmentioning

confidence: 99%

Low apparent valence of Mg during corrosion

et al. 2014

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“…Previous investigations [3,[5][6][7][8][9] have shown that the electrochemical behaviour of Mg electrodes is strongly dependent on anodizing parameters (electrolyte composition, pH, current density, and/or voltage scanning rates, etc.). Depending on their characteristics, electrolytes may act as (i) strong passivators (e.g.…”

Section: Introductionmentioning

confidence: 99%

Initial surface film on magnesium metal: A characterization by X-ray photoelectron spectroscopy (XPS) and photocurrent spectroscopy (PCS)

Santamaria

Quarto

Zanna

et al. 2007

Electrochimica Acta

257

135

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A detailed investigation of the initial film grown on mechanically polished Mg electrodes has been carried out by ex situ X-ray Photoelectron Spectroscopy (XPS) and in situ Photocurrent Spectroscopy (PCS), allowing to reach a detailed picture of the passive layer structure. The XPS data show that the films formed soon after mechanical treatment and immersion in aqueous electrolyte have a bilayer structure, consisting of an ultra-thin MgO inner layer (∼2.5 nm) and a Mg(OH) 2 external layer. The thickness of the Mg(OH) 2 layer is a function of immersion time and solution temperature. After mechanical treatment and immersion in aqueous solution at room temperature, the MgO/Mg(OH) 2 layer in some area of electrodes is so thin to allow an electron photoemission process from the Mg Fermi level to the electrolyte conduction band. Only internal photoemission processes are evidenced for Mg electrodes aged in NaOH at 80 • C, due the formation of a thicker Mg(OH) 2 layer. From anodic photocurrent spectra an optical band gap of ∼4.25 eV has been estimated for Mg(OH) 2 , lower with respect to the optical gap of the corresponding anhydrous counterpart.

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“…This phenomenon is termed the negative difference effect (NDE), and has been well documented for many decades. [6][7][8][9][10][11] The physical conditions responsible for the NDE remain an important research topic in the context of the complete understanding of Mg as an electrode.…”

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confidence: 99%

“…9,12 The film breakdown is suggested to uncover additional cathodic sites, resulting in an enhanced catalytic activity for HER. 18,19 For alkaline pH values, a protective magnesium hydroxide film (MgO/Mg(OH) 2 14 ) forms, while Mg dissolves easily under acidic and neutral conditions.…”

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The pH Dependence of Magnesium Dissolution and Hydrogen Evolution during Anodic Polarization

Rossrucker

Samaniego

Grote

et al. 2015

J. Electrochem. Soc.

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The dissolution of magnesium (Mg) has been investigated with an electrochemical flow cell coupled to downstream analysis. The setup allows for polarization experiments and simultaneous determination of the amount of dissolved magnesium ions via inductively coupled plasma -mass spectroscopy (ICP-MS). Additionally, Mg dissolution was compared to hydrogen evolution measurements in the flow cell and also in standard beakers. Experiments were performed in unbuffered NaCl and in buffered solutions of various pH to determine the influence of the pH on surface film stability and Mg dissolution. In borate buffer (pH 10.5), Mg(OH) 2 was found to be more stable than in unbuffered electrolyte. In the flow cell, the negative difference effect (NDE) was absent for low anodic polarization currents in a neutral buffered solution, whilst high anodic polarization currents and unbuffered electrolytes favored its existence. In beaker experiments, strong NDE was observed in a pH 10.5 buffer, and also in pH 7 and 3 buffers, but only at higher applied currents where the buffering capacity was locally overwhelmed. These observations validate the importance of the pH in near surface regions with respect to the stability of Mg-surface films and subsequent NDE.

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The electrochemical corrosion of pure magnesium in 1 N NaCl

Cited by 560 publications

References 9 publications

Low apparent valence of Mg during corrosion

Low apparent valence of Mg during corrosion

Initial surface film on magnesium metal: A characterization by X-ray photoelectron spectroscopy (XPS) and photocurrent spectroscopy (PCS)

The pH Dependence of Magnesium Dissolution and Hydrogen Evolution during Anodic Polarization

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