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Effect of solid-solution treatment on corrosion and electrochemical behaviors of mg-15y alloy in 3.5 wt.% NaCl solution

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Journal of Rare Earths 2012年第11期30卷 1158-1167页

作者：张新张奎李兴刚邓霞李永军马鸣龙石阳 State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Nonferrous Metals Military Representative Office of People's Liberation Army Stationed in 618 Factory

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 mg24ys. The Ecor~ 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.

关键词： mg-15y alloy polarization curves oittin corrosion solid-solution treatment rare earths

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Relationship between Heat Treatment and Corrosion Behavior of mg-15y alloy

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Journal of Wuhan University of Technology(Materials Science) 2015年第4期30卷 796-803页

作者：徐宏 DENG Xia 张新 ZHANG Kui LIU yanpeng LI Shaohua School of Materials Science and Engineering North University of China State Key Lab for Fabrication &Processing of Non-ferrous Metals Beijing General Research Institute for Non-ferrous Metals Institute of Thermal Power Generation Technology China Datang Coporation Science and Technology Research Institute

The corrosion behaviors of a basic type of RE-containing magnesium alloy mg-15y processed by different heat treatment methods were studied in 3.5% NaC1 solution at room temperature. The amount of mg24y5 phase decreased with the extending of homogenization treatment. The time for achieving dissolving equilibrium of homogenization treatment at 525, 535, and 545 ℃ was 24, 20, and 8 h, respectively. The corrosion behavior of mg-15y alloy was studied using immersion, hydrogen evolution and electrochemical tests. The experimental results revealed that the heat treatment improved the corrosion resistance, and the corrosion resistance became better with increasing the heat treatment time. The corrosion mode of the alloy after heat treatment was microgalvanic corrosion consisting of the cathodic mg24y5 phase and anodic α-mg matrix, and mg-15y exhibited favorable uniform corrosion mode in NaC1 solution. The volume and increasing tendency of the homogenization treatment samples were both more than those of the as-cast sample.

关键词： homogenization heat-treatment microstructures corrosion behavior mg-15y alloy

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