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Pourbaix diagram of iron. [1] The Y axis corresponds to voltage potential. In electrochemistry, and more generally in solution chemistry, a Pourbaix diagram, also known as a potential/pH diagram, E H –pH diagram or a pE/pH diagram, is a plot of possible thermodynamically stable phases (i.e., at chemical equilibrium) of an aqueous electrochemical system.
Pourbaix diagram of iron in uncomplexed media (anions other than OH-not considered). Ion concentration 0.001 m (mol/kg water). Ion concentration 0.001 m (mol/kg water). Temperature 25°C.
Marcel Pourbaix (16 September 1904 – 28 September 1998) was a Belgian chemist and pianist. [citation needed] He performed his most well known research at the University of Brussels, studying corrosion. [1] His biggest achievement is the derivation of potential-pH, better known as “Pourbaix Diagrams”.
Pourbaix diagram for gold in simple non-complexing aqueous solutions (anions other than OH-not considered). Ion concentration 0.001 m (mol/kg water). Ion concentration 0.001 m (mol/kg water). Temperature 25°C.
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The conditions necessary, but not sufficient, for passivation are recorded in Pourbaix diagrams. Some corrosion inhibitors help the formation of a passivation layer on the surface of the metals to which they are applied. Some compounds, dissolved in solutions (chromates, molybdates) form non-reactive and low solubility films on metal surfaces.
English: Pourbaix diagram for Manganese; c(Mn) = 1 mol/l, T = 25 °C. Source own work . This W3C-unspecified vector image was created with Inkscape. Data Source