A peridynamic model for galvanic corrosion and fracture

Jiangming Zhao, Siavash Jafarzadeh, Mohammad Rahmani, Ziguang Chen, Yong Rak Kim, Florin Bobaru

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A coupled peridynamic (PD) corrosion-fracture model is introduced, in which the local corrosion rate is determined by solving the corresponding electrostatic problem. By being able to consider variable distributions of corrosion rates along the anodic surface, the model is particularly useful for simulating galvanic corrosion. A novel analytical calibration for parameters in the corrosion model is provided. The corrosion model is verified in terms of the electric potential, current density, and corrosion depth, and validated against experimental results for AE44 (Mg alloy) – mild steel and AE44 – AA6063 (Al alloy) galvanic couples taken from the literature. The PD results are also compared with those from a COMSOL FEM-based model. It is found that an artificial initial “step-down” in geometry at the galvanic joint is required for the COMSOL model in order to provide reasonable results, but it is not needed in the PD model. A coupled galvanic corrosion-fracture problem accounting for the combined electro-chemical attack and strains induced by mechanical loadings is solved.

Original languageEnglish (US)
Article number138968
JournalElectrochimica Acta
Volume391
DOIs
StatePublished - Sep 20 2021
Externally publishedYes

Keywords

  • COMSOL
  • Electrostatics
  • Fracture
  • Galvanic corrosion
  • Peridynamics

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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