sci.corrosion-Tafel-corrosion-rate Calculator
Calculates corrosion rate from polarisation curves using the Tafel extrapolation method and Butler-Volmer exchange current density. Corrosion rate = i_corr × M/(nFρ) in mm/year — mild steel in seawater: i_corr ≈ 10⁻⁵ A/cm² → ≈0.1 mm/year corrosion rate.
Inputs
- I Corr Ua Cm2
- Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
- M G Mol
- Mass of one mole of the substance (g/mol). Found by summing atomic weights. Converts between grams and moles.
- N Equiv
- Reference formula or conversion factor shown for context.
- Rho G Cm3
- Mass per unit volume (kg/m³). Water: 1,000. Air: 1.225. Steel: 7,850. Affects buoyancy, flow, and structural loads.
Results
- corrosion rate CR (mm/yr)
- The value at the specified point or condition.
- corrosion rate (mpy — mils per year)
- The value at the specified point or condition.
- corrosion current i_corr (A/cm²)
- Electric charge flow rate (A). Governs wire sizing — too much current causes dangerous heating. Fuses protect circuits from overcurrent.
- CR = i_corr·M·t/(n·F·ρ)
- Sample size or count used in the calculation.
- severity classification
- Category assigned based on where the computed value falls on a defined scale. Check which standard or guideline defines these boundaries.
- iron reference
- Sample size or count used in the calculation.
mils corrosion current year tafel