Corrosion behavior of an AZ91D magnesium alloy under a heterogeneous electrolyte layer

The corrosion behavior of an AZ91D magnesium alloy was investigated under a heterogeneous electrolyte layer by using electrochemical methods and surface analysis techniques. Dynamic polarization curves and morphological characterization were obtained at the center and near the edge zones under the e...

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Bibliographic Details
Published in:PloS one 2020-06, Vol.15 (6), p.e0234981-e0234981
Main Authors: Wang, Yanhua, Zhen, Cheng, Zhang, Zhan, Tao, Zhencheng
Format: Article
Language:English
Subjects:
Atmospheric corrosion
Carbon dioxide
Chemical engineering
Chemical properties
Chemistry
Chloride
Corrosion
Corrosion (Chemistry)
Corrosion rate
Earth Sciences
Ecology and Environmental Sciences
Edge zones
Education
Electrochemistry
Electrodes
Electrolytes
Filiform corrosion
Humidity
Laboratories
Magnesium
Magnesium alloys
Magnesium base alloys
Marine ecology
Mass transport
Morphology
Observations
Physical Sciences
Pitting (corrosion)
Potassium
Silver
Surface analysis (chemical)
Theory
Transport processes
Wire
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Summary:The corrosion behavior of an AZ91D magnesium alloy was investigated under a heterogeneous electrolyte layer by using electrochemical methods and surface analysis techniques. Dynamic polarization curves and morphological characterization were obtained at the center and near the edge zones under the electrolyte layer. The influence of the gas/liquid/solid three-phase boundary zone (TPB) on the corrosion behavior of the AZ91D magnesium alloy was discussed. The corrosion rate changed more significantly near the TPB zone than that at the other zones. The AZ91D alloy exhibited the characteristics of filiform corrosion together with shallow pitting corrosion. Different from the randomly distributed shallow pits, the filiform corrosion preferred to initiate near the TPB region and then progressively expanded adjacent to the edge of the electrolyte layer. The TPB zone played a vital role in determining the corrosion location, the corrosion morphologies and the corrosion rate of the magnesium alloy by influencing the mass transport process of carbon dioxide.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0234981