The effect of varying Al concentrations on the electrochemical corrosion resistance of binary Mg-Al solid solutions thin films under alkaline immersion conditions was investigated via a combination of in-situ flow-cell, scanning vibrating electrode technique and microscopy analysis. These spatially resolving characterization techniques are employed along the Al concentration gradient of the combinatorically grown thin films enabling efficient screening of the Al concentration dependent electrochemical corrosion behaviour. The analysis revealed an increasing corrosion resistance with increasing Al concentration, as a consequence of Al induced hydroxide reinforcement. Specifically, the addition of >4 wt.% Al decreases the corrosion current density in the range of 70–90 % compared to pure Mg.

中文翻译：

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Al对二元Mg-Al固溶体耐腐蚀性的影响：原位电化学与组合薄膜相结合


通过原位流通池、扫描振动电极技术和显微镜分析相结合，研究了碱性浸泡条件下不同 Al 浓度对二元 Mg-Al 固溶体薄膜电化学耐腐蚀性的影响。这些空间分辨表征技术沿着组合生长的薄膜的铝浓度梯度采用，能够有效筛选铝浓度依赖性电化学腐蚀行为。分析表明，由于铝诱导的氢氧化物强化，耐腐蚀性随着铝浓度的增加而增加。具体而言，与纯镁相比，添加 >4 wt.% 的铝可将腐蚀电流密度降低 70-90%。