Pourbaix Diagram Calculator
Analyze metal stability as a function of pH and electrode potential. Determine corrosion, passivation, and immunity regions.
Pourbaix Analysis Parameters
Water Stability Lines:
H2/H2O: E = -0.0591 * pH
O2/H2O: E = 1.23 - 0.0591 * pH
Stability Region
Corrosion
Dominant Species: Fe2+ / Fe3+
pHpH
7.0
EE (vs SHE)
0.00 V
H2H2 Line
-0.414 V
O2O2 Line
0.816 V
Corrosion
Active dissolution of metal occurs
Recommendations:
- - Active corrosion expected
- - Apply cathodic protection
- - Use corrosion inhibitors
Water Stability:
Within water stability region
Understanding Pourbaix Diagrams
Immunity
Metal is thermodynamically stable. No corrosion occurs.
Passivation
Protective oxide layer forms on metal surface.
Corrosion
Metal actively dissolves as soluble ions.
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