Zhijie Dai, Zhengbing Xiao, Dahong Zhao, Sunhang Xiao, Yuanchun Huang and Qingsong Dai
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引用次数: 0
摘要
我们对具有不同微观结构的 5083 铝合金进行了电化学实验,并通过 SEM 和 EBSD 对腐蚀前后的样品进行了测量。同时,利用密度泛函理论计算了 Mg2Al3 相的氯离子吸附行为,从多尺度上解释了腐蚀机理。结果表明,晶粒大小不同的边缘试样和心部试样在热处理后表现出不同的趋势。具体来说,温度升高会导致心部区域的晶粒尺寸变大,而边缘区域的晶粒尺寸变小。此外,与 520 °C 相比,550 °C 热处理后第二相的数量更多。晶粒大小会影响钝化膜的致密性以及第二相与基底之间的电位差,从而导致腐蚀性的变化。密度泛函理论计算表明,Mg2Al3 (001)MgAl 和 (001)Al 表面对 Cl- 具有更高的吸附敏感性,在 (001)MgAl 的镁顶和 (001)Al 的铝顶位点,Cl- 的吸附能最低。Cl- 与镁原子之间更强的结合力会导致不同方向的晶间腐蚀。
Multi-scale study on the electrochemical behavior and corrosion mechanism of 5083 aluminum alloy with different microstructures in a NaCl environment
We conducted electrochemical experiments on 5083 aluminum alloy with different microstructures and measured the samples before and after corrosion by SEM and EBSD. At the same time, density functional theory was used to calculate the chloride ion adsorption behavior of the Mg2Al3 phase, which explained the corrosion mechanism on a multi-scale. The results indicated that edge and heart specimens with varying grain sizes exhibited different trends post heat treatment. Specifically, increasing temperature led to larger grain sizes in the heart region, while smaller grain sizes were observed at the edge. Furthermore, the quantity of the second phase was higher after heat treatment at 550 °C compared to 520 °C. The grain size affects the densification of the passivation film and the potential difference between the second phase and the substrate, leading to variations in corrosivity. Density functional theory calculation demonstrates that the Mg2Al3 (001)MgAl and (001)Al surfaces exhibit higher susceptibility to Cl− adsorption, showing the lowest adsorption energies of Cl− at the Mg-top of (001)MgAl and Al-top sites of (001)Al. A stronger bond between Cl− and Mg atoms leads to intergranular corrosion in different directions.
期刊介绍:
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