Reducing the corrosion rate of magnesium alloys using ethylene glycol for advanced electrochemical imaging

Asmussen, R. Matthew; Binns, W. Jeffrey; Jakupi, Pellumb; Dauphin‐Ducharme, Philippe; Tefashe, Ushula M.; Mauzeroll, Janine; Shoesmith, David W.

doi:10.1016/j.corsci.2015.01.011

Cited by 17 publications

(11 citation statements)

References 38 publications

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“…The test solution was prepared by dissolving NaCl in ethylene glycol to obtain a 3.5 wt % NaCl solution. This solvent was selected in order to slow down the corrosion process . In order to apply SECM in feedback mode, the electrolyte included 1 mM FcMeOH to serve as the redox mediator.…”

Section: Experimental Sectionmentioning

confidence: 99%

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Fitting Kinetics from Scanning Electrochemical Microscopy Images of Finite Circular Features

et al. 2022

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Scanning electrochemical microscopy (SECM) is a powerful technique for imaging the electrochemical reactivity of a surface. Unfortunately, SECM images are mainly used qualitatively. Kinetics of reactions at the surface are almost exclusively obtained from the microelectrode current as it approaches the surface, called an approach curve. The approach curve method is excellent when the reaction at the surface has the same kinetics everywhere, but was not designed to fit the kinetics of finite-sized reactive features. We propose a method for extracting kinetics, feature area, and microelectrode tip-to-substrate distance from SECM images by fitting with simulated images of reactive discs using the Levenberg–Marquardt algorithm. The area of experimental reactive features can be fit to within 10% if the underlying feature is roughly disc-shaped. When the reaction at simulated reactive features is activation-limited, the rate constant can be fit to within 15% of the true value. This work heralds the beginning of quantifying kinetics from SECM images.

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Section: Experimental Sectionmentioning

confidence: 99%

“…This solvent was selected in order to slow down the corrosion process. 21 In order to apply SECM in feedback mode, the electrolyte included 1 mM FcMeOH to serve as the redox mediator.…”

Section: ■ Introductionmentioning

confidence: 99%

Fitting Kinetics from Scanning Electrochemical Microscopy Images of Finite Circular Features

et al. 2022

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“…As a result, considerable effort and research over the past few decades have produced improved techniques with increased spatial resolution [Rossi et al, 2008]. These include localised EIS and SVET [Asmussen et al, 2015;Oltra et al, 2007;Rossi et al, 2008;Zhang and Cheng, 2009]. A further approach is to confine the area under study, by using micro-electrodes, possessing very small surface areas [Bonzom and Oltra, 2016; Cook et al, 2012a;Laycock and Newman, 1997;Speckert and Burstein, 2011;Tang and Davenport, 2007], or droplet cells, in which a very small proportion of a larger surface is exposed to solution (Section 3.4.1.2).…”

Section: Electrochemical Techniquesmentioning

confidence: 99%

Nanometre to micrometre length-scale techniques for characterising environmentally-assisted cracking: An appraisal

Clark

Burrows

Patel

et al. 2020

Heliyon

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The appraisal is strongly focussed on challenges associated with the nuclear sector, however these are representative of what is generally encountered by a range of engineering applications. Ensuring structural integrity of key nuclear plant components is essential for both safe and economic operation. Structural integrity assessments require knowledge of the mechanical and physical properties of materials, together with an understanding of mechanisms that can limit the overall operating life. With improved mechanistic understanding comes the ability to develop predictive models of the service life of components. Such models often require parameters which can be provided only by characterisation of processes occurring in situ over a range of scales, with the sub-micrometrescale being particularly important, but also challenging. This appraisal reviews the techniques currently available to characterise microstructural features at the nanometre to micrometre length-scale that can be used to elucidate mechanisms that lead to the early stages of environmentally-assisted crack formation and subsequent growth. Following an appraisal of the techniques and their application, there is a short discussion and consideration for future opportunities.(i) crack pre-initiation and initiation (ii) small cracks (iii) long cracks

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“…The capabilities of SECM in this operation mode allow to monitor different systems in situ. However, only a few studies on Mg alloys have been conducted with SECM [15][16][17][18][19][20][21][22][23][24], of which not all focus on biomedical applications. The goal of this study is to detect through SECM the initial stages of electrochemical activity on AZ31 Mg alloy surface during its exposure to buffered simulated body fluid (SBF).…”

Section: Secm In Feedback Modementioning

confidence: 99%

Initial Electrochemical Activity of Magnesium Alloy AZ31 Surface Exposed to Simulated Body Fluid by Scanning Electrochemical Microscopy

Mena-Morcillo

Véleva

Wipf

2019

BJSTR

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This study applies scanning electrochemical microscopy (SECM) in feedback mode to monitor the initial activity of AZ31 magnesium alloy surface, exposed to simulated body fluid (SBF). The alloy surface suffers a degradation process since the very first moments of immersion, considered as intense uniform activity and later a localized attack was detected. The additional information provided by SEM-EDS helped to characterize the composition of sites of interest observed on the AZ31 surface. The corrosion layer contains O, C, P and Ca coming from the SBF solution, as well as the basic elements of the alloy Mg, Al, Zn and Mn. The results allowed concluding that the locally formed pits nucleated around Al-Mn intermetallic particles in contact with the Mg alloy matrix, as a consequence of chloride ions attack.

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Reducing the corrosion rate of magnesium alloys using ethylene glycol for advanced electrochemical imaging

Cited by 17 publications

References 38 publications

Fitting Kinetics from Scanning Electrochemical Microscopy Images of Finite Circular Features

Fitting Kinetics from Scanning Electrochemical Microscopy Images of Finite Circular Features

Nanometre to micrometre length-scale techniques for characterising environmentally-assisted cracking: An appraisal

Initial Electrochemical Activity of Magnesium Alloy AZ31 Surface Exposed to Simulated Body Fluid by Scanning Electrochemical Microscopy

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