Parameters
Material / Environment Presets
Corrosion current density icorr
10.0 μA/cm²
Corrosion potential Ecorr
-500 mV
Anodic Tafel slope βa
80 mV/dec
Cathodic Tafel slope βc
120 mV/dec
Temperature T
25 °C
pH
7.0
Material Properties
Atomic weight M (g/mol)
55.85
Valence n
2
Density ρ (g/cm³)
7.87
Wall thickness (mm)
10.0 mm
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icorr (μA/cm²)
—
Corrosion rate (mm/year)
—
Corrosion rate (mpy)
—
Penetration life (years)
Evans Diagram (E vs log|i|)
Corrosion Rate vs Temperature (Arrhenius)
Theory
Butler-Volmer equation:
$$i = i_{corr}\left[\exp\!\left(\frac{\eta}{\beta_a/\ln10}\right) - \exp\!\left(-\frac{\eta}{\beta_c/\ln10}\right)\right]$$Corrosion rate (Faraday's law):
$$CR\,[\text{mm/y}] = \frac{3.27 \times M \times i_{corr}}{n \times \rho}$$$i_{corr}$ [μA/cm²], $M$ [g/mol], $n$ [valence], $\rho$ [g/cm³]
CAE Integration: Corrosion rate is used as input for FEM wall-thinning models and residual strength analysis. Evans diagrams are combined with EIS analysis for corrosion fatigue life calculations in LS-DYNA and Abaqus.