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首页> 外文期刊>RSC Advances >The role of alloyed strontium in the microstructures and alkaline electrochemistry of Mg–5Al–4Sn alloys
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The role of alloyed strontium in the microstructures and alkaline electrochemistry of Mg–5Al–4Sn alloys

机译：合金锶在Mg-5Al-4Sn合金中合金锶在微观结构和碱性电化学中的作用

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摘要

In this study, strontium is used as an alloying element for improving the pitting resistance of Mg–5Al–4Sn based alloys in an alkaline solution. Potentiodynamic polarization measurements suggest that the addition of strontium increases the robustness of the pitting resistance as a result of the higher pitting potential and wider range of passive potential. Electrochemical impedance spectroscopy (EIS) confirms the formation of a solid passive film on the alloy surface due to a significant increase in the passive film and the charge transfer resistance, as well as lower film and double layer constant phase element magnitude values. Additionally, the potentiostatic polarisation results also show a lower passive current density and passive film stability, resulting in an increase in the breakdown time when the amount of strontium added to the alloy increases from 0.0 to 1.0 wt%. Furthermore, the scanning electron microscopy results indicate that insignificant corrosion is observed on alloy specimens containing strontium, whereas there is fierce corrosion on alloy based surfaces. This robust corrosion resistance could be attributed to the α-grain reduction and refined precipitates at the alloy grain boundaries, resulting in promoted formation of the passive film which is formed from a mixture of magnesium, aluminum and tin oxides/hydroxides, as confirmed by the X-ray photoelectron spectroscopy results.
机译：在该研究中，锶用作合金元件，用于改善碱性溶液中Mg-5Al-4Sn基合金的蚀抗性。电位动力学极化测量表明，由于较高的蚀势和更广泛的被动电位，增加锶的增加增加了蚀性阻力的鲁棒性。电化学阻抗光谱（EIS）由于被动膜和电荷传递电阻的显着增加，以及较低膜和双层恒定相幅度值，确认在合金表面上形成固体无源膜。另外，电位辐射偏振结果还显示出较低的无源电流密度和无源膜稳定性，导致击穿时间增加，当加入到合金的锶的量增加00至1.0wt％时。此外，扫描电子显微镜结果表明在含有锶的合金标本上观察到微不足道的腐蚀，而基于合金的表面存在剧烈腐蚀。这种稳健的耐腐蚀性可归因于合金晶界的α-粒降低和精制沉淀物，导致由镁，铝和氧化锡/氢氧化物的混合物形成的无源膜的形成，如此X射线光电子能谱结果。

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