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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 56901 (07)
- University: Sharif University of Technology
- Department: Materials Science and Engineering
- Advisor(s): Tavakoli, Rouhollah
- Abstract:
- Corrosion is an electrochemical process that results in the degradation of metallic materials in a corrosive environment. Localized corrosion is a destructive form of corrosion that can lead to catastrophic failure of structures. In developed countries, corrosion costs more than 3% of gross national product every year, much more than the costs arisen from all-natural disasters combined. It is very important to understand this process to prevent sudden accidents and also develop high strength corrosion resistant metallic materials. This study presents the formulation and implementation of a phase field model for simulating the activation- and diffusion-controlled pitting corrosion phenomena in metallic materials. Introducing an auxiliary phase field variable to represent the physical state of each material point, the free energy of the corroding metal–electrolyte system can be expressed as a function of field variables and their gradients. The governing equations for the evolution of each field variable are then derived such that the system free energy is decreased during the mass transfer and metal dissolution processes. The propagation of the diffuse interface is tracked implicitly by solving the phase field variable over the entire system, which allows the accurate approximation of complex morphological evolutions. The phase field model has been validated against experimental and analytical results, and several examples of the applications of this model for understanding corrosion behavior in one and two dimensions are presented
- Keywords:
- Phase Field Model ; Pitting Corrosion ; Stainless Steel ; Modeling ; Corrosion Resistance
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