Microstructure and Corrosion Behavior of AZ91-0.4%Nd Magnesium Alloy

Jumei Zhang; Zhi Hu Wang; Wan Chang Sun; Ming Zhu

doi:10.4028/www.scientific.net/AMM.291-294.2577

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Microstructure and Corrosion Behavior of AZ91-0.4%Nd Magnesium Alloy

Abstract:

The corrosion behavior of AZ91-0.4%Nd alloys was investigated by immersion test in 3.5wt.% NaCl at 25°C. The phase compositions and microstructure of the AZ91-0.4%Nd alloy were characterized by XRD and OM, respectively. The results show that the number of Nd element in the AZ91 magnesium alloy has effect on the grain refining efficiency, and the granular or acicular Al₃Nd phase precipitate in matrix.The corrosion products of the AZ91-0.4%Nd alloy mainly composed of Mg(OH)₂ and Al. The addition of Nd element significantly refine the microstructure and improve the compactness of corrosion products of AZ91-0.4%%Nd magnesium alloy, as a result the corrosion resistance of alloy was improved obviously.