Anomalous hydrogen evolution on AZ31, AZ61 and AZ91 magnesium alloys in unbuffered sodium chloride solution

Fajardo, S.; Bosch, Juan P.; Frankel, G. S.

doi:10.1016/j.corsci.2018.10.039

Cited by 44 publications

(23 citation statements)

References 32 publications

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“…However, from a thermodynamic point of view, even if these impurities act as local cathodes, any shift of the potential towards the anodic domain should result in a decrease of the hydrogen production reaction. Consequently, the metal impurities cannot be the only ones responsible for the NDE, but such behavior has been further investigated for alloying elements [19,20].…”

Section: Introductionmentioning

confidence: 99%

On the corrosion mechanism of Mg investigated by electrochemical impedance spectroscopy

Gomes

Costa

Pébère

et al. 2019

Electrochimica Acta

196

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This work reported a detailed analysis of the electrochemical impedance spectra obtained for the Mg electrode during immersion in a sodium sulfate solution. A model was proposed which took into account the presence of: (i) a thin oxide film (MgO) which progressively covered the Mg electrode surface, (ii) film-free areas where the Mg dissolution occurs in two consecutive steps, (iii) a thick layer of corrosion products (Mg(OH) 2), (iv) an adsorbed intermediate ðMg þ ads Þ which is responsible for the chemical reaction allowing the negative difference effect to be explained. From the impedance data analysis, various parameters were extracted such as the thin oxide film thickness, the resistivity at the metal/oxide film interface and at the oxide film/electrolyte interface, the active surface area as a function of the exposure time to the electrolyte, the thickness of the thick Mg(OH) 2 layer and the kinetic constants of the electrochemical reaction.

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Section: Introductionmentioning

confidence: 99%

On the corrosion mechanism of Mg investigated by electrochemical impedance spectroscopy

Gomes

Costa

Pébère

et al. 2019

Electrochimica Acta

196

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“…), where oxygen reduction reaction (ORR) is the main cathodic process. 1,[4][5][6][7][8] A convincing explanation for the predominance of HER is the highly negative corrosion potential exhibited by Mg. 9 HER : 2H 2 O þ 2e À ! H 2 " þ2OH À (1)…”

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confidence: 99%

High rate oxygen reduction reaction during corrosion of ultra-high-purity magnesium

et al. 2020

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Comprehending the corrosion mechanism of magnesium is of major interest in diverse fields. Typically, hydrogen evolution reaction is considered as the only cathodic reaction during Mg corrosion. However, recent works demonstrate importance of considering oxygen reduction reaction (ORR) as a second cathodic process at specific conditions. With oxygen micro-optode, we show that ORR rate was higher on slower corroding ultra-high-purity Mg (UHP-Mg), while lower on faster corroding commercially pure Mg (CP-Mg), where massive hydroxide layer impeded oxygen permeation. These findings shed light on yet another facet of complex mechanism of Mg corrosion.

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“…At about 250°C and at normal pressure, magnesium and hydrogen can be produced, which can release hydrogen at low pressure or slightly higher temperature [22]. In the field of electrochemistry, hydrogen can also cause hydrogen corrosion in the form of hydrogen bulging [23][24][25], hydrogen embrittlement [26][27][28], and hydrogen corrosion [29,30]. Hydrogen can be immersed between the lattice of the metal and expand or deform the lattice and finally make the metal brittle that is called as hydrogen embrittlement.…”

Section: Introductionmentioning

confidence: 99%

A New Method of Edge Crack Suppression in the Rolling Process of Magnesium Alloy Sheet and Study on the Method of Cathodic Protection

Zhu

et al. 2020

Advances in Materials Science and Engineering

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A new method is proposed to solve edge cracking and corrosion in rolling process of the magnesium alloy plate. Usually in the process, the edge cracking is caused by the great temperature difference between the edge and the center of the alloy plate and the corrosion is by water in air. The method uses hot air wrapped around the plate to perfectly prevent edge cracking and corrosion. The method also includes cathodic protection for the magnesium alloy based on electrochemistry. The suppression of cathodic protection on the chemical activity of the magnesium alloy was studied. The experiment shows that the new method of edge heating with hot air wrapping is effective to prevent edge cracking and corrosion. Also, the cathodic protection can effectively suppress the chemical activity of the magnesium alloy and improve the surface quality in the rolling process of the magnesium plate, which provides a new concept in rolling process of the magnesium alloy.

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Anomalous hydrogen evolution on AZ31, AZ61 and AZ91 magnesium alloys in unbuffered sodium chloride solution

Cited by 44 publications

References 32 publications

On the corrosion mechanism of Mg investigated by electrochemical impedance spectroscopy

On the corrosion mechanism of Mg investigated by electrochemical impedance spectroscopy

High rate oxygen reduction reaction during corrosion of ultra-high-purity magnesium

A New Method of Edge Crack Suppression in the Rolling Process of Magnesium Alloy Sheet and Study on the Method of Cathodic Protection

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