Journal
CORROSION SCIENCE
Volume 165, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2019.108384
Keywords
Mg alloys; Hydrogen evolution; Anodic dissolution; Beta phase (Mg17Al12); Negative difference effect (NDE)
Funding
- State Research Agency (Ministry of Science, Technology and Universities of Spain)
- Spanish National Research Council (CSIC)
- European Regional Development Fund (ERDF) [MAT2015-74420-JIN]
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The role of the Mg17Al12 second phase on the anomalous HE and anodic dissolution of AZ31 and AZ91 Mg alloys was investigated. A passive-like behavior was exhibited by the Mg17Al12 phase with strong anomalous HE originating from local anodic regions where the passive film had broken down. The Mg17Al12 exhibited lower HE rates than the AZ Mg alloys during anodic polarization. Surface characterization confirmed that dissolution of Mg17Al12 in the AZ91 alloy only occurred above the E-b for the Mg17Al12. Under anodic polarization, greater amounts of Mg17Al12 arc beneficial for AZ Mg alloys durability, decreasing the Mg matrix dissolution rates.
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