期刊
ELECTROANALYSIS
卷 28, 期 10, 页码 2354-2366出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201600265
关键词
Magnesium; SECM; hydrogen evolution; pH gradients; microelectrode probe
资金
- Spanish Ministry of Economy and Competitiveness (MINECO, Madrid)
- European Regional Development Fund (Brussels, Belgium) [CTQ2012-36787]
- University of La Laguna
- University of Pecs [SROP-4.2.2.D-15/1/Konv-2015-0015]
Scanning Electrochemical Microscopy (SECM) is presented as an essential tool for the local characterization of the still uncertain mechanism for magnesium corrosion. The reaction leading to magnesium release and hydrogen evolution from separated magnesium cathodes and anodes has been imaged using an adequate combination of the operation modes available in SECM. Magnesium ion selective microelectrodes (Mg-ISME's) were used for the visualization of the heterogeneously distributed release of magnesium (II) species. Antimony microelectrodes detected the pH gradients in the adjacent electrolyte resulting from either water or magnesium electrolysis, whereas platinum microdiscs were used to monitor the concomitant local evolution of hydrogen. Alkalization and H-2 generation were observed over the magnesium strip polarized as cathode, whereas a small local acidification was observed above the strip polarized anodically, at which extensive heterogeneous magnesium release was also imaged.
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