Effect of solid-solution treatment on corrosion and electrochemical behaviors of Mg-15Y alloy in 3.5 wt.% NaCl solution |
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Authors: | ZHANG Xin ZHANG Kui LI Xinggang DENG Xia LI Yongjun MA Minglong SHI Yang |
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Affiliation: | 1.State Key Laboratory for Fabrication and Processing of Nonferrous Metals,General Research Institute for Nonferrous Metals,Beijing 100088,China;2.Military Representative Office of People’s Liberation Army Stationed in 618 Factory,Beijing 100072,China) |
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Abstract: | The effect of solid-solution treatment on corrosion and electrochemical mechanisms of Mg-15Y alloy in 3.5 wt.% NaCl solution was investigated by electrochemical testing, immersion testing and SEM observation. The results indicated that the corrosion resistance of Mg-15Y sample gradually deteriorated with immersion time increasing, which was consistent with the observation of corrosion morphologies. The solid-solution treatment decreased the amounts of second phase Mg24Y5. The Ecorr and corrosion rate of as-cast samples were both lower than those of solid solution-treated samples, and both increased with increment of solid solution-treated time. The corrosion mechanism was proposed for the galvanic, pitting and filiform corrosion which varied with the immersion time and solid-solution treatment. |
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Keywords: | Mg-15Y alloy polarization curves oittin corrosion solid-solution treatment rare earths |
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