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Mg-6%Al-5%Pb (mass fraction) anodes with different contents of zinc were prepared by melting and casting. The electrochemical
discharge behavior of these anodes in 3.5% NaCl solutions was investigated by galvanostatic test and electrochemical impedance
spectroscopy (EIS). The microstructures and the corroded surfaces of these anodes were studied by scanning electron microscopy
(SEM) and emission spectrum analysis (ESA). The phase structures and the corrosion products of the anodes were analyzed by
X-ray diffraction (XRD). The results show that zinc promotes the grain refinement of Mg-6%Al-5%Pb anode and makes the average
discharge potential of Mg-6%Al-5%Pb anode more negative during galvanostatic test. Mg-6%Al-5%Pb anode with the addition of
1% (mass fraction) zinc has the best electrochemical performance. The activation mechanism of zinc to Mg-6%Al-5%Pb anode is
as follows: The hydrolyzation of dissolved Zn2+ ions reduces the pH value of the solution near the surface of the anode and accelerates the dissolution of Mg(OH)2 film; The precipitated Zn(OH)2 with similar structure as Mg(OH)2 combines with Mg(OH)2 film easily and makes it break down. 相似文献
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Influence of Mg21Ga5Hg3 compound on electrochemical properties of Mg-5%Hg-5%Ga alloy 总被引:2,自引:1,他引:1
The Mg-Hg-Ga alloys are widely used in high power the seawater batteries. Mg-5%Hg-5%Ga alloy was melted and heat treatments at 573-773 K were performed for different times. The electrochemical and corrosion behaviors of the Mg-5%Hg-5%Ga alloy were studied by means of potentiodynamic, galvanostatic and electrochemical impedance spectroscopy(EIS). Scanning electron microscopy(SEM), energy dispersive spectrometry(EDS) and X-ray diffractometry(XRD) were employed to characterize the microstructures of the alloy. The results demonstrate that the best electrochemical activity occurs in the Mg-5%Hg-5%Ga alloy with homogeneously dispersed Mg21Ga5Hg3 compound in α-Mg matrix. The most negative mean potential at 100 mA/cm2 polarization current density can reach -1.928 V. The largest corrosion current density 19.37 mA/cm2 of the Mg-5%Hg-5%Ga alloy appears in the Mg-5%Hg-5%Ga alloy with intergranular eutectic α-Mg and Mg21Ga5Hg3. 相似文献
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采用熔炼铸造法制备添加不同含量Ce的AP65镁合金。采用X射线衍射(XRD)、扫描电镜(SEM)和电子探针(EPMA)研究Ce对AP65镁合金显微组织的影响。采用恒电流放电、动电位极化扫描、化学浸泡研究不同Ce含量AP65镁合金的腐蚀电化学行为。结果表明:随Ce含量增加,合金中依次出现棒状或簇状的Al4Ce相和块状的Al2Ce相。Ce的添加导致AP65镁合金的电化学性能明显提高,添加0.6%(质量分数)的Ce使AP65镁合金的平均放电电位从-1.648 V(vs SCE)负移到-1.756 V(vs SCE);添加4%的Ce使AP65镁合金具有较小的腐蚀电流密度(19.66μA/cm2)和较高的阳极利用率(84.3%),与未添加Ce的AP65镁合金相比,阳极利用率提高16.6%。 相似文献
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