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Hack, HP

doi:10.1520/stp26187s

Cited by 1 publication

(2 citation statements)

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“…6,9 From galvanic theory it is known that when two different materials are electrically connected, in the presence of an electrolyte, the more active one is preferentially corroded. 39 Figure 4 shows theoretical polarization curve (green curve) for a typical galvanic couple. This curve is constructed from superposition of anodic and cathodic Tafel plots of two different materials: one noble (blue) and one active (orange).…”

Section: Peridynamic Model For Intergranular Corrosionmentioning

confidence: 99%

“…21,34 Here, for IGC, solid media itself consists of two different zones: GB and grain matrix (or simply grains). Based on the mixed potential theory, 39,40 for potential values higher than the galvanic corrosion potential, each material dissolves according to its own anodic Tafel line. In our model, accordingly, we assign two different dissolution affinities to grains and to GB nodes.…”

Section: Peridynamic Model For Intergranular Corrosionmentioning

confidence: 99%

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Peridynamic Modeling of Intergranular Corrosion Damage

Jafarzadeh

Chen

Bobaru

2018

J. Electrochem. Soc.

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A new peridynamic (PD) model for Intergranular corrosion (IGC) damage is presented. The model can simulate conditions ranging from grain boundary-only corrosion to full grain dissolution. Compared with other models, we require minimal input data for calibration: Tafel kinetics and electrolyte diffusion coefficient. Once calibrated, the PD model predicts, quantitatively, the penetration depth of the corrosion front as well as the morphology of the corroded microstructure in AA2024-T3 exposed to NaCl solution. We note that, when grain dissolution is negligible over hours, the diffusion controlled assumption gives results that match well the experimental observations. Tests for anisotropic microstructures confirm the direction dependency of corrosion penetration in rolled AA2024-T3 sheets. Without any other changes to the model, increasing the applied potential leads to partial and full grain dissolution. The PD model introduced here can be applied to any polycrystalline alloy.

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Section: Peridynamic Model For Intergranular Corrosionmentioning

confidence: 99%