Sono-immersion deposition on magnesium alloy

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Journal titleJournal of the Electrochemical Society
Subjectimmersion; sono-immersion; coating; deposition; magnesium; AZ91
AbstractCoating is a viable way to improve the corrosion resistance of magnesium alloys for aerospace and automotive applications. This paper presents the acoustic effect on the copper immersion coating of AZ91 magnesium alloy. Electrochemical impedance spectroscopy and open-circuit potential measurements were conducted to characterize the copper immersion-coating processes. The surface morphology changes of the copper immersion coatings obtained with and without sonication were examined using scanning electron microscopy. All experimental results have clearly demonstrated a significant increase of surface coverage on magnesium alloy. Data analysis indicated that formation of a surface film on the uncoated magnesium area during immersion coating under nonsonicated condition restrained magnesium dissolution which, in turn, limited the deposition process. The application of sonication induced asymmetric cavitations at the interface and efficiently destroyed or prevented the formation of a surface film. As a result, the anodic reaction (magnesium dissolution) was maintained to provide a continuous driving force for cathodic copper reduction and deposition, hence increasing the surface coverage.
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AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NPARC number21272503
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Record identifier0db7b25d-c081-4326-b368-9d4da93b9e39
Record created2014-12-01
Record modified2016-05-09
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