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Effect of heat treatment on corrosion and electrochemical behaviour of AZ91D magnesium alloy

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Abstract

An AZ91D ingot in the as-cast condition was homogenized by solution treatment and then aged for various periods of time. The microstructures produced were studied in detail and the β phase volume fraction was measured quantitatively. The Corrosion resistance of all the different microstructures was studied in 3.5% NaCl solution through weight loss measurement in constant immersion conditions and potentiodynamic polarization experiments. The corroded surfaces were analysed using SEM and XRD. The volume fraction of the β phase was found to have a significant influence on the corrosion behaviour. The T4 condition improved the corrosion resistance of AZ91D alloy compared to the T6 heat treatment. The results support the idea of microgalvanic coupling between cathodic β phase and anodic α matrix.

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Authors and Affiliations

  1. School of Mechanical and Production Engineering, Nanyang Technological University, Singapore, 639798

    N.N. Aung

  2. Division of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, Cambridge, MA, 02138-2901, USA

    W. Zhou

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  1. N.N. Aung
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  2. W. Zhou
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Correspondence to W. Zhou.

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Aung, N., Zhou, W. Effect of heat treatment on corrosion and electrochemical behaviour of AZ91D magnesium alloy. Journal of Applied Electrochemistry 32, 1397–1401 (2002). https://doi.org/10.1023/A:1022698916817

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