Aluminum Pitting Corrosion in Halide Media: A Quantum Model and Empirical Evidence

作者：Lashgari Mohsen^*; Kianpour Effat; Mohammadi Esmaeil

来源：Journal of Materials Engineering and Performance, 2013, 22(12): 3620-3625.

DOI：10.1007/s11665-013-0669-x

• aluminum oxide surface
• atomistic insight
• cluster model
• halide/surface interaction
• pitting phenomenon

The phenomenon of localized damage of aluminum oxide surface in the presence of halide anions was scrutinized at an atomistic level, through the cluster approach and density functional theory. The phenomenon was also investigated empirically through Tafel polarization plots and scanning electron microscopy. A distinct behavior witnessed in the fluoride medium was justified through the hard-soft acid-base principle. The atomistic investigations revealed the greatest potency for chloride entrance into the metal oxide lattice and rationalized to the severity of damage. The interaction of halide anions with the oxide surface causing some displacements on the position of Al atoms provides a mechanistic insight of the phenomenon.

• 出版日期2013-12