Anomalous hydrogen evolution on AZ31, AZ61 and AZ91 magnesium alloys in unbuffered sodium chloride solution

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 2019 English Publisher:Elsevier BVJournal:Corrosion Science, volume 146, pages 163-171 (issn: 0010-938X,

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Authors: S. Fajardo; J. Bosch; G.S. Frankel;

doi: 10.1016/j.corsci.2018.10.039

handle: 10261/187411

Anomalous hydrogen evolution on AZ31, AZ61 and AZ91 magnesium alloys in unbuffered sodium chloride solution

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Abstract

The anomalous hydrogen evolution (HE) exhibited by the Mg alloys AZ31, AZ61 and AZ91 was studied in unbuffered 0.1 M NaCl solution using electrochemical testing and gravimetric hydrogen collection. Strong anomalous HE was observed for all three alloys, but the rate decreased with increasing content of Al. The cathodic potentiodynamic response and surface appearance of the different alloys showed that the corrosion products were not responsible for the anomalous HE. Assessment of the charge transfer coefficients for the Mg dissolution and HE reactions supported the previously-proposed kinetic model describing how anomalous HE originates at the actively dissolving Mg regions.

S. Fajardo expresses his gratitude to the State Research Agency (Ministry of Science, Technology and Universities of Spain), the Spanish National Research Council (CSIC) and the European Regional Development Fund (ERDF) for the financial support under the Project MAT2015-74420-JIN (AEI/FEDER/UE). The authors thank J.C. Galván for supplying the AZ91Mg alloy.

Peer reviewed

Peer Reviewed

Related Organizations

Spanish National Research Council
Spain
The Ohio State University
United States
Cenim - Centro Nacional De Investigaciones Metalurgicas
Spain

Keywords

Mg alloys, Anodic dissolution, Corrosion products, Negative difference effect (NDE), Hydrogen evolution

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