Abstract
ABSTRACT The effects of Ga addition (1, 2, 3 and 5 wt-%) on the corrosion behaviour of high strain rate rolled Mg–Ga alloys are firstly investigated by weight loss measurement and electrochemical testing. Solute Ga atoms can reduce the corrosion potential but improve the corrosion resistance of the alloy with the Ga content lower than 3 wt-%. The Mg–3Ga alloy sheet is the most corrosion-resistant with the weight loss rate of 0.52 mg cm−2 day−1 for 7 days immersion in 3.5% NaCl solution. The corrosion resistance improvement can be ascribed to the enhanced compactness of the corrosion film associated with Ga addition. The Ga addition affects the DRX degree, but the DRX degree is not the crucial factor in the corrosion of the alloys. The Mg5Ga2 dynamic precipitates are detrimental to the corrosion resistance of the Mg–Ga alloys and play a relatively important role in the corrosion of the Mg–5Ga alloy.
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