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51317--9779-Pitting Corrosion in AZ31 Magnesium Alloy in Potassium-Based Electrolytes

AZ31 (UNS M11311) is a wrought magnesium alloy used in aerospace and automotive applications. In this work, KOH-based electrolytes were used to study the corrosion behavior of AZ31 alloy in highly alkaline environment. The effect of dopants and exposure time on pit initiation was studied via optical and scanning electron microscopy.

Product Number: 51317--9779-SG
ISBN: 9779 2017 CP
Author: Somi Doja
Publication Date: 2017
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AZ31 is a popular wrought magnesium alloy used in many aerospace and automotive applications. However its use is hindered by the lack of information regarding its corrosion. Of particular interest is pitting corrosion which was seen to cause localized corrosion in aqueous environments.In this work KOH-based electrolytes were used to study the corrosion behavior of AZ31 alloy. The effect of dopants and exposure time on the initiation of pitting was studied via SEM and optical microscopy. Long-time exposure immersion tests and electrochemical impedance spectroscopy were carried out to study the stability of the corrosion products and progression of degradation. The results suggest that the presence of trace amounts of elements (e.g. silicates) resulted in a change of pitting mechanism of AZ31.

Key words: UNS M11311, magnesium, aerospace, KOH-based electrolytes, SEM

 

AZ31 is a popular wrought magnesium alloy used in many aerospace and automotive applications. However its use is hindered by the lack of information regarding its corrosion. Of particular interest is pitting corrosion which was seen to cause localized corrosion in aqueous environments.In this work KOH-based electrolytes were used to study the corrosion behavior of AZ31 alloy. The effect of dopants and exposure time on the initiation of pitting was studied via SEM and optical microscopy. Long-time exposure immersion tests and electrochemical impedance spectroscopy were carried out to study the stability of the corrosion products and progression of degradation. The results suggest that the presence of trace amounts of elements (e.g. silicates) resulted in a change of pitting mechanism of AZ31.

Key words: UNS M11311, magnesium, aerospace, KOH-based electrolytes, SEM