摘要
Zirconium oxide nanoparticles with 0.4 wt.%and 0.8 wt.%are incorporated into the Al-0.65 Mg-0.05 Ga-0.15 Sn(wt.%)alloy anode(base alloy)in order to improve the performance of the resulting anodes.Electrochemical characterization of the reinforced alloys was done by potentiodynamic polarization,electrochemical impedance spectroscopy and galvanostatic discharge and corrosion behavior was evaluated using self-corrosion rate and hydrogen evolution in 4 mol/L KOH solution.The surface morphology of the alloys was also studied using field emission scanning electron microscope(FESEM).The obtained results indicate that the base alloy shows high corrosion rate in 4 mol/L KOH solution by releasing 0.47 m L/(min·cm^2)hydrogen gas,whereas the alloy containing 0.8 wt.%Zr O2 provides the lowest hydrogen evolution rate by releasing 0.32 m L/(min·cm^2)hydrogen gas.Furthermore,by increasing zirconium oxide nanoparticles,the corrosion current density of the aluminum anodes is decreased and their corrosion resistance increases significantly compared to the base alloy in alkaline solution.In addition,nanometer-sized zirconium oxide incorporated anodes exhibit the improved galvanic discharge efficiencies,so that 0.8 wt.%nano-zirconium oxide incorporated base alloy displays the highest power density and anodic utilization compared with the others in 4 mol/L KOH solution.
为了提高合金的阳极性能,在Al-0.65Mg-0.05Ga-0.15Sn(质量分数,%)基体合金阳极中加入0.4%和0.8%(质量分数)的氧化锆纳米颗粒,采用电化学动态极化、电化学阻抗谱和恒电流放电等方法对颗粒增强后的合金进行电化学表征,采用在4 mol/L KOH溶液中的自腐蚀速率和析氢率对增强合金的腐蚀行为进行评价,并利用场发射扫描电子显微镜(FESEM)研究合金的表面形貌。结果表明,基体合金在4 mol/L KOH溶液中,释放出0.47m L/(min·cm^2)的氢气,腐蚀速率较高,而含0.8%(质量分数)Zr O2的合金释放出0.32 m L/(min·cm^2)的氢气,腐蚀速率最低。此外,通过添加氧化锆纳米颗粒,能够降低铝阳极在碱性溶液中的腐蚀电流密度,其耐腐蚀性明显优于基体合金。此外,添加纳米氧化锆的阳极材料具有更高的电流放电效率,在4 mol/L KOH溶液中,添加0.8%(质量分数)纳米氧化锆的合金表现出最高的功率密度和阳极利用率。
