Hydrogen evolution on bare Mg surfaces using the scratched electrode technique
By Gabbardo, Aline D.; Frankel, G. S.
Published in Corrosion Science
2019
Abstract
The scratched electrode technique is used to study reaction rates of bared Mg surfaces with the aim of studying the anomalous hydrogen evolution phenomenon. Scratched Mg surfaces are more catalytic than filmed unscratched surfaces to dissolution and hydrogen evolution reactions and repassivation happens within milliseconds at anodic potentials in NaOH solution. The rate of anomalous hydrogen evolution reaction depends on surface condition, which for the bared scratch surface varies little with potential in this electrolyte. The reformation of an hydroxide monolayer limits dissolution and hydrogen evolution reactions. In environments containing chloride and sulfate, formation of a monolayer is less effective.
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