Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/89297
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Title: Phase field study of mechanico-electrochemical corrosion
Authors: Lin, C 
Ruan, H 
Shi, SQ 
Issue Date: 1-Jul-2019
Source: Electrochimica acta, 1 July 2019, v. 310, p. 240-255
Abstract: A phase field (PF)model was proposed to investigate corrosion in a stressed metal. The Allen–Cahn equation, associated with the Nernst–Planck, Poisson's, and mechanical equilibrium equations, was established to govern phase transformation, ion diffusion, electric potential distribution, and mechanical deformation, respectively. The electrochemical reaction rate was expressed as a function of the electrochemical potentials of reactants and products based on a detailed balance of reactions, which conforms to a generalized Butler–Volmer relationship. The numerical results reveal that the stress concentration at the tip of a corrosion pit promote a higher corrosion rate, which leads to a sharpened tip and the accelerated failure of a metallic structure. To consider a more complicated scenario, a metal matrix composite (MMC)reinforced with inert fibers/particles was investigated. If a fixed displacement boundary condition is applied, the corrosion resistance of the MMC would benefit from the decrease in reinforcement stiffness; whereas when the MMC is under a constant load, a stiffer reinforcement would result in an increase in corrosion resistance.
Keywords: Electrochemical mechanism
Mechanical deformation
Phase field model
Pitting corrosion
Publisher: Pergamon Press
Journal: Electrochimica acta 
ISSN: 0013-4686
DOI: 10.1016/j.electacta.2019.04.076
Rights: © 2019 Elsevier Ltd. All rights reserved.
© 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
The following publication Lin, C., Ruan, H., & Shi, S.-Q. (2019). Phase field study of mechanico-electrochemical corrosion. Electrochimica Acta, 310, 240-255 is available at https://doi.org/10.1016/j.electacta.2019.04.076.
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