Modeling of the Iron Anodic Dissolution

摘要

Patterns of anodic dissolution of iron are interpreted in the light of notion of the cooperative nature of the electronic subsystem of metal and the proton subsystem acidic electrolyte. Admitted, that speed limiting process of anodic ionization of the metal in the low-voltage surge is a doubly charged ion desorption from the surface, requiring "embedding" it in the near-electrode layer of electrolyte. The article presents a mathematical model of the anodic dissolution of iron in acidic media, based on the phenomenological picture of the processes occurring on the surface of the metal. The model allows for the possibility of dissolution as a set of consecutive outputs of the iron atoms from the kink at low voltage and cooperative processes at high anodic overpotentials, such as solitons of dissolution. Comparison of calculated and experimental data shows that the model largely agrees with the experiment. Obviously, that needs clarification of the soliton model for a more complete description of all available sets of experimental data on anodic dissolution of iron.