基于三维格子Boltzmann铝点蚀动态数值模拟

铝作为目前最经济且应用最为广泛的材料之一，具有重量轻、耐腐蚀、导热性好、导电性好等优点。然而，金属铝在氯离子环境中容易发生点蚀。根据中性溶液中铝表面点蚀反应机理，结合液体流动和相变特性，建立了三维格子Boltzmann铝点蚀模型，研究了中性溶液中铝表面的点蚀现象，弥补了传统实验方法的不足。采用建立的腐蚀模型对整个铝点蚀过程进行了模拟，得到了不同组分的浓度分布以及不同参数与腐蚀程度的关系。结果表明：铝的腐蚀程度随接触时间的增加而增加。随着初始氯离子浓度的增加和腐蚀反应速率的增大，铝被腐蚀得更严重。三维格子Boltzmann铝点蚀模型为金属腐蚀数值研究提供了新的思路。

Dynamic numerical simulation of aluminum pitting based on 3D-lattice Boltzmann method

As one of the most economical and widely applied materials, aluminum has the advantages of light weight, corrosion resistance, and good thermal and electrical conductivity. However, aluminum is prone to pitting in chloride ion environments. Taking into account the aluminum surface pitting mechanism in neutral solution and liquid flow and phase transition characteristics, this study established a three-dimensional lattice Boltzmann model to examine the pitting phenomenon on aluminum surface in neutral solution, overcoming the deficiency of traditional experimental methods. The whole aluminum pitting process was simulated by the established corrosion model, and the concentration distribution of different components and the relationship between different parameters and corrosion degree were obtained. The results show that the degree of aluminum corrosion increases with the increase of contact time. Furthermore, the higher the initial chloride ion concentration, and the higher the corrosion reaction rate is, the more severe aluminum corrosion becomes. Therefore, the three-dimensional lattice Boltzmann aluminum pitting model provides a new approach to the future numerical study of metal corrosion.