The origin of passivity in aluminum-manganese solid solutions
The origin of passivity in aluminum-manganese solid solutions
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DOI：
10.1016/j.corsci.2020.108749
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发表时间：
2020-08-15
影响因子：
8.3
通讯作者：
Cai, Wenjun
中科院分区：
文献类型：
--
作者：
Chen, Jia;Xiao, Jianwei;Cai, Wenjun
通过实验和原子模拟研究了锰对铝锰合金水溶液腐蚀的影响。电化学测量、x射线光电子能谱和原子探针层析分析表明，锰的加入提高了铝的耐腐蚀性，但不参与表面氧化。锰的选择性溶解被认为增加了金属/氧化物界面的自由体积，有利于形成更致密、更薄、更接近化学计量组成的氧化层。原子模拟结果表明，随着Al中自由体积含量的增加，氧化层致密度增加，缺陷密度降低，导致势垒特性增强。
The effects of manganese on the aqueous corrosion of aluminum-manganese alloys were investigated by experiments and atomistic simulations. Electrochemical measurements, x-ray photoelectron spectroscopy, and atom probe tomography analysis indicate that manganese addition enhanced the corrosion resistance of aluminum without participating in the surface oxidation. The selective dissolution of manganese was believed to increase the free volume at the metal/oxide interface to facilitate the formation of a denser, thinner oxide layer with closer to stoichiometry composition. Atomistic simulations showed that the oxide layer compactness increased, and defect density decreased with increasing free volume content in Al, resulting in enhanced barrier characteristics.