Mixed Potential Evans Diagram Calculator

Electrochemical Corrosion Kinetics: Calculate open-circuit mixed potential ($E_{corr}$), corrosion current density ($i_{corr}$), and penetration rates from Evans diagrams.

Anodic Metal Oxidation (M → Mⁿ⁺ + ne⁻)

Anodic Reversible $E_{0,a}$ (V vs SHE):

Exchange Current $i_{0,a}$ (A/cm²):

Anodic Tafel Slope $\beta_a$ (V/decade):

Cathodic Reduction (e.g. 2H⁺ + 2e⁻ → H₂)

Cathodic Reversible $E_{0,c}$ (V vs SHE):

Exchange Current $i_{0,c}$ (A/cm²):

Cathodic Tafel Slope $\beta_c$ (V/decade):

Metal Physical Constants

Equivalent Weight $EW$ (g/eq):

Density $\rho$ (g/cm³):

Mixed Potential & Corrosion Rate

Corrosion Potential ($E_{corr}$)

-- V

Anodic Overpotential: -- mV

Corrosion Current ($i_{corr}$)

-- µA/cm²

Current Density: -- A/m²

Penetration Rate ($CR$)

-- mm/year

Rate in mpy: -- mils/yr

Wagner-Traud Equilibrium

Active Dissolution

Cathodic Overpotential: -- mV

Evans Kinetic Intersection:

• $\log_{10}(i_{corr}) = \frac{E_{0,c} - E_{0,a} + \beta_a \log_{10}(i_{0,a}) + \beta_c \log_{10}(i_{0,c})}{\beta_a + \beta_c}$.

• Faraday conversion: $CR = 0.00327 \cdot \frac{i_{corr} [\mu\text{A/cm}^2] \cdot EW}{\rho [\text{g/cm}^3]}$ mm/year.

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Mixed Potential Evans Diagram Calculator

Anodic Metal Oxidation (M → Mⁿ⁺ + ne⁻)

Cathodic Reduction (e.g. 2H⁺ + 2e⁻ → H₂)

Metal Physical Constants

Mixed Potential & Corrosion Rate

Frequently Asked Questions