Evolution of hydrogen at dissolving magnesium surfaces
TL;DR: In this paper, a combined experimental and thermodynamic analysis suggests that the ability of magnesium to support the cathodic reaction is enhanced during dissolution as the result of an increase in the exchange current density for the hydrogen evolution reaction, which can also explain high rates of hydrogen evolution in aluminium pits.
About: This article is published in Corrosion Science.The article was published on 2013-05-01. It has received 331 citations till now. The article focuses on the topics: Hydrogen & Magnesium.
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TL;DR: There remains growing interest in magnesium (Mg) and its alloys, as they are the lightest structural metallic materials Mg alloys have the potential to enable design of lighter engineered systems, including positive implications for reduced energy consumption as mentioned in this paper.
1,173 citations
Cites background from "Evolution of hydrogen at dissolving..."
...20 shows how an Evans diagram of the Mg dissolution and HER half reactions could be affected if i0,H,Mg increases due to anodic polarization [62]....
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...It is possible to describe the ability of anodically polarized Mg surfaces to support HE at increasing rates as being the result of an increase in the exchange current density for the HER (i0,H,Mg) [62]....
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...Changes in Erev,H and bc have been shown to have a small effect [62], but the catalytic activity of a surface is known to have a huge impact on the rate of HE....
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...Schematic Evans diagram explaining the increased rates of anomalous HE with increasing potential by the effects of exchange current density for HER [62]....
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...Even though the hydrogen evolution reaction (HER) is not a diffusion-controlled reaction, H2 oxidation mapping using the SECM provides qualitative results [72]....
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TL;DR: A review of recent developments in the field of Mg corrosion and putting those into context is provided in this paper, which includes considerations of corrosion manifestations, material influences, surface treatment, anodization, coating, inhibition, biodegradable medical applications, stress corrosion cracking, flammability, corrosion mechanisms for HP Mg, critical evaluation of corrosion mechanisms, and concluding remarks.
Abstract: This paper provides a review of recent developments in the field of Mg corrosion and puts those into context. This includes considerations of corrosion manifestations, material influences, surface treatment, anodization, coatings, inhibition, biodegradable medical applications, stress corrosion cracking, flammability, corrosion mechanisms for HP Mg, critical evaluation of corrosion mechanisms, and concluding remarks. There has been much research recently, and much research continues in this area. This is expected to produce significantly better, more-corrosion-resistant Mg alloys.
575 citations
TL;DR: In this paper, experiments were conducted to enable the simultaneous measurement of electrochemical impedance and collection of hydrogen gas during the corrosion of pure magnesium in NaCl solutions, which provided three unique measures of magnesium corrosion for the same specimen.
446 citations
TL;DR: In this article, the authors investigated the role of hydrogen dissolved in the Mg metal during corrosion and during anodic polarisation, and the size film-free area where corrosion occurs, and how to measure this area.
374 citations
TL;DR: In this paper, the influence of alloying on the corrosion of Mg-alloys is reviewed, with particular emphasis on the underlying electrochemical kinetics that dictate the ultimate corrosion rate.
Abstract: The demand for light-weighting in transport and consumer electronics has seen rapid growth in the commercial usage of magnesium (Mg). The major use of Mg is now in cast Mg products, as opposed to the use of Mg as an alloying element in other alloy systems and there is an emerging market of wrought Mg products and biomedical Mg components – such that the past two decades have seen a significant number of new Mg-alloys reported. None-the-less, the corrosion of Mg alloys continues to be a challenge facing engineers seeking weight reductions by deployment of Mg. Herein, authors review the influence of alloying on the corrosion of Mg-alloys, with particular emphasis on the underlying electrochemical kinetics that dictate the ultimate corrosion rate. Such a review focusing on the chemistry–corrosion link, both in depth and in a holistic approach, is lacking. As such the authors do not describe aspects such as high-temperature oxidation or cracking, but focus on delivering the state-of-the-art with regar...
358 citations
References
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Book•
01 Jan 1980
TL;DR: In this paper, the authors present a comprehensive overview of electrode processes and their application in the field of chemical simulation, including potential sweep and potential sweep methods, coupled homogeneous chemical reactions, double-layer structure and adsorption.
Abstract: Major Symbols. Standard Abbreviations. Introduction and Overview of Electrode Processes. Potentials and Thermodynamics of Cells. Kinetics of Electrode Reactions. Mass Transfer by Migration and Diffusion. Basic Potential Step Methods. Potential Sweep Methods. Polarography and Pulse Voltammetry. Controlled--Current Techniques. Method Involving Forced Convention--Hydrodynamic Methods. Techniques Based on Concepts of Impedance. Bulk Electrolysis Methods. Electrode Reactions with Coupled Homogeneous Chemical Reactions. Double--Layer Structure and Adsorption. Electroactive Layers and Modified Electrodes. Electrochemical Instrumentation. Scanning Probe Techniques. Spectroelectrochemistry and Other Coupled Characterization Methods. Photoelectrochemistry and Electrogenerated Chemiluminescence. Appendix A: Mathematical Methods. Appendix B: Digital Simulations of Electrochemical Problems. Appendix C: Reference Tables. Index.
20,533 citations
TL;DR: In this article, the electrochemical behavior of magnesium was studied in representative chloride and sulphate solutions including NaCl, Na2SO4, NaOH and their mixed solutions, HCl, and H2SO 4: (1) by measuring electrochemical polarisation curves, (2) by using electrochemical impedance spectroscopy (EIS), and (3) by simultaneous measurement of hydrogen gas evolution and measurement of magnesium dissolution rates using ICPEAS.
757 citations
TL;DR: This paper aims to elucidate the main benefits and limitations for each of the major in vitro methodologies used in examining the biodegradation behaviour of Mg and its alloys.
683 citations