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Iron Pourbaix Diagram: Corrosion, Immunity & Passivation

Interactive potential-pH (Pourbaix) diagram for the iron-water system. Drag the operating point across pH and electrode potential and watch a 3D electrode dissolve, sit inert, or grow a protective oxide film, with every boundary line derived live from the Nernst equation.

Chemistry & Materials3DAdvanced60 FPS📱 Mobile-adapted⇄ 2D version

Every electrochemical corrosion problem comes down to two numbers: the electrode's potential and the solution's pH. This simulator draws a real potential-pH (Pourbaix) diagram for the iron-water system, with every boundary line derived on the fly from the Nernst equation and the solubility product of Fe(OH)₂ rather than hard-coded, and links it to a 3D electrode that actually dissolves into Fe²⁺ ions in the corrosion region, sits inert in the immunity region, and grows a protective oxide film in the passivation region. Drag the diagram or the pH/potential sliders to explore why cathodic protection, alkaline treatment and passivating coatings all work by moving the operating point into a different region of the same diagram.

⚙ Under the hood

Interactive potential-pH (Pourbaix) diagram for the iron-water system with every boundary line derived live from the Nernst equation, linked to a 3D electrode that dissolves, sits inert, or grows a passivating oxide film depending on where you set the operating point.

electrochemistrycorrosionNernst equationPourbaix diagrammaterials sciencechemistry

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install