Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Evaluation of Pitting Corrosion Mechanism of AZ31 Magnesium Alloy by Monitoring Acoustic Emission
Hye-Young KimJae-Yeon KimSeung-Mi LeeJai-Won Byeon
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JOURNALS FREE ACCESS Advance online publication

Article ID: M2016302


The aim of this study was to evaluate the electrochemical corrosion mechanism of AZ31 magnesium alloy by monitoring acoustic emission (AE). AE signals were monitored in situ during the potentiodynamic corrosion test. Evolution of AE signal appeared to be divided into four distinct stages (AE stage I, II, III, and IV) according to the corrosion time and mechanism. AE characteristics in each AE stage were correlated with the bubble behavior, reflecting corrosion mechanism. This interpretation was verified with the simultaneous observation of corrosion bubbling by video camera.

Fig. 1 Polarization curve and corresponding cumulative AE counts divided into four stages during the electrochemical corrosion test. Fullsize Image
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© 2016 The Japan Institute of Metals and Materials