A quantitative phase-field model for crevice corrosion

• Published in: Computational materials science 2018-06, Vol.149 (C), p.37-48
• Main Authors: Xiao, Z.H., Hu, S.Y., Luo, J.L., Shi, S.Q., Henager, C.H.
• Format: Article
• Language: English
• Subjects: Crevice corrosion; Electrochemical simulation; Iron; Phase-field modeling
• ISSN: 0927-0256; 1879-0801
• DOI: 10.1016/j.commatsci.2018.03.011

[Display omitted] •A one-dimensional quantitative phase-field model for the study of crevice corrosion of iron in salt water is proposed.•The transient distributions of ion concentrations and electric potential in the electrolyte, and some physical and chemical properties related to corrosion are studied.•A sharp interface model is built and used as the benchmark of the phase-field model.•The corrosion rates predicted by the two models are in the same order of magnitudes with experimental results.•This work provides a good foundation for extending the phase-field model to 2D and 3D, not only on modeling of localized corrosion, but also on modeling of porous evolution in metals. A quantitative phase-field model is developed for the investigation of crevice corrosion of iron in salt water. Six types of ionic species and some associated chemical reactions have been considered. In addition to the transient distributions of ion concentrations and electric potential in the electrolyte, some physical and chemical properties related to corrosion, such as overpotential, pH value and corrosion rate, under different metal potentials are studied. Benchmarking of the phase-field model against a sharp interface model is conducted. The corrosion rates predicted by the models are in the same order of magnitudes with experimental results.