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Physical and Electrochemical Evidence for the Role of a Mg Hydride Species in Mg Alloy Corrosion

Published on Jan 1, 2019in Corrosion 1.86
· DOI :10.5006/2918
W. Jeffrey Binns5
Estimated H-index: 5
(UWO: University of Western Ontario),
Fareshta Zargarzadah1
Estimated H-index: 1
(UWO: University of Western Ontario)
+ 3 AuthorsD.W. Shoesmith27
Estimated H-index: 27
(UWO: University of Western Ontario)
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Abstract
The role of MgH2 in the process of filiform-like corrosion on Mg alloys has been investigated. MgH2 was grown galvanostatically on the Mg ZEK100 alloy at a current density of −5 mA/cm2 for various times in 0.1 M NaOH and the subsequent electrochemical and corrosion behavior compared to that of as-polished specimens. Polarization curves demonstrated cathodic activity under anodic polarization (i.e., the “negative difference effect”) while x-ray diffraction confirmed the presence of MgH2. Dynamic secondary ion mass spectrometry measurements show strong evidence for the presence of MgH2 in aged sections of corrosion filaments, in the leading edge of corrosion filaments, and in the Mg matrix ahead of the leading edge of corrosion filaments in alloys corroded at Ecorr. The presence of these hydrides is linked to the filiform-like corrosion morphology observed on Mg alloys via in situ monitoring. These hydrides are responsible for the filiform-like corrosion by acting as temporary metastable catalysts for hydro...
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Published on Jun 1, 2019in Electrochemistry Communications 4.20
J.A. Yuwono (UNSW: University of New South Wales), Christopher D. Taylor18
Estimated H-index: 18
(OSU: Ohio State University)
+ 2 AuthorsS. Fajardo12
Estimated H-index: 12
(CSIC: Spanish National Research Council)
Abstract Despite the growing interest in Mg and its alloys, their use has been largely limited due to their high reactivity in aqueous environments. Improving the understanding of the basic principles of Mg corrosion represents the first step to explain and, eventually, improve the corrosion behaviour of Mg alloys. Herein an original mechanistic surface kinetic DFT model that clarifies the mechanism of anomalous HE on anodically polarised Mg is presented. In accordance with several experimental ...
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Published on Feb 1, 2019in Corrosion Science 6.36
Jodie A. Yuwono4
Estimated H-index: 4
(OSU: Ohio State University),
Nick Birbilis57
Estimated H-index: 57
(ANU: Australian National University)
+ 3 AuthorsNikhil V. Medhekar19
Estimated H-index: 19
(Monash University, Clayton campus)
Abstract In this study, first-principles density functional theory (DFT) calculations are performed to investigate the contribution of each individual reaction at the magnesium/water interface. Thermodynamic and kinetic models derived from the DFT-calculated parameters are used to describe interdependent reactions at the interface and the resultant magnesium electrochemical activity at different pH and potentials. These models are able to rationalise experimental findings, such as those obtained...
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