Understanding Tribocorrosion of Aluminum at the Crystal Level
Understanding Tribocorrosion of Aluminum at the Crystal Level
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了解铝在晶体水平上的摩擦腐蚀
DOI：
10.1016/j.actamat.2022.118639
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发表时间：
2023
期刊：
影响因子：
9.4
通讯作者：
Cai, Wenjun
中科院分区：
文献类型：
--
作者：
Wang, Kaiwen;Zhang, Zhengyu;Dandu, Raja Shekar;Cai, Wenjun
铝（Al）及其合金在中性水溶液中具有持续的钝性，是优良的耐腐蚀材料。然而，摩擦腐蚀仍然是对Al完整性的主要威胁，在此期间，腐蚀和磨损协同作用，加速材料降解。在这项工作中，使用Al单晶进行了结合实验和计算的研究，以开发基于晶体的摩擦腐蚀建模框架，该框架考虑了晶格重定向和位错对表面腐蚀的影响。具体来说，实验测量了Al（100）、（110）和（111）单晶的机械、腐蚀和摩擦腐蚀性能，然后通过电子背散射衍射（EBSD）表征了晶格旋转和位错密度。与取向相关的机械和腐蚀性能不同，摩擦腐蚀速率对晶体的初始取向不敏感。利用实验结果作为输入和验证，建立了一个多物理场有限元模型，通过将局部腐蚀动力学映射为钝化状态、晶体取向和位错密度的函数，成功地预测了摩擦腐蚀过程中的脱钝化和再钝化电流。发现晶格旋转，而不是位错，主导了整个摩擦腐蚀行为。最后，摩擦腐蚀过程中取向依赖性的降低可以用未磨损区未旋转晶格与磨损区旋转晶格之间的耦合来解释。
Aluminum (Al) and its alloys are excellent corrosion-resistant materials due to their sustained passivity in neutral aqueous solutions. However, tribocorrosion remains a major threat to the integrity of Al, during which corrosion and wear work synergistically to accelerate material degradation. In this work, a combined experimental and computational investigation was carried out using Al single crystals to develop a crystal-based tribocorrosion modeling framework that accounts for the effects of lattice reorientation and dislocations on surface corrosion. Specifically, the mechanical, corrosion, and tribocorrosion properties of Al (100), (110), and (111) single crystals were measured experimentally, followed by characterization of lattice rotation and dislocation density via electron backscattered diffraction (EBSD). Unlike the mechanical and corrosion properties that are orientation-dependent, the tribocorrosion rate was found to be insensitive to the initial orientations of the crystals. Using the experimental results as inputs and validations, a multiphysics finite element model was developed that successfully predicted the depassivation and repassivation currents during tribocorrosion by mapping the local corrosion kinetics as a function of passivation state, crystallographic orientation, and dislocation density. It was found that lattice rotation, rather than dislocations, dominates the overall tribocorrosion behavior. Finally, the decrease of orientation-dependence during tribocorrosion was explained in terms of the coupling between the un-rotated lattice in the unworn region and the rotated lattice from the worn region.
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