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  The pH dependence of magnesium dissolution and hydrogen evolution during anodic polarization

Rossrucker, L., Samaniego, A., Grote, J.-P., Mingers, A. M., Laska, C. A., Birbilis, N., et al. (2015). The pH dependence of magnesium dissolution and hydrogen evolution during anodic polarization. Journal of the Electrochemical Society, 162(7), C333-C339. doi:10.1149/2.0621507jes.

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Rossrucker, Lisa1, Author           
Samaniego, Alejandro2, 3, Author           
Grote, Jan-Philipp1, Author           
Mingers, Andrea Maria1, Author           
Laska, Claudius Alexander1, Author           
Birbilis, Nick4, Author           
Frankel, Gerald S.5, Author           
Mayrhofer, Karl Johann Jakob1, Author           
1Electrocatalysis, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863354              
2Department of Materials Science and Engineering, Ohio State University, Columbus, OH, USA, ou_persistent22              
3National Centre for Metallurgical Research (CENIM-CSIC), Department of Materials Engineering, Corrosion and Durability, Madrid, Spain, ou_persistent22              
4Department of Materials Engineering, Monash University, Clayton, VIC 3800, Australia, ou_persistent22              
5Department of Materials Science and Engineering, Ohio State University, Columbus, OH 43210, USA, ou_persistent22              


Free keywords: Anodic polarization; Electrolytes; Hydrogen; Inductively coupled plasma; Magnesium; Mass spectrometry; Metal ions; Plasma diagnostics; Polarization
 Abstract: 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. (C) The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0.License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org. All rights reserved.


Language(s): eng - English
 Dates: 2015
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: 000355643700053
DOI: 10.1149/2.0621507jes
 Degree: -



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Title: Journal of the Electrochemical Society
  Abbreviation : J. Electrochem. Soc.
Source Genre: Journal
Publ. Info: New York, NY, USA : Electrochemical Society
Pages: - Volume / Issue: 162 (7) Sequence Number: - Start / End Page: C333 - C339 Identifier: ISSN: 0013-4651
CoNE: https://pure.mpg.de/cone/journals/resource/991042748197686