![]() This equilibrium indicates electron transfer as well as pH. Sloping, straight lines give the redox potentials of a solution in equilibrium.Vertical lines are potential-independent but pH-dependent and not accompanied by any electron transfer.They are pH-independent, but potential-dependent. Horizontal lines represent electron transfer reactions.Passivity: forming passive layers inhibiting the corrosion process on the surface of the metal.Pourbaix diagrams provide information on three states of metals: Where: E = electrode potential V E0 = standard electrode potential, V n = number of electrons transferred Cion = molar activity (concentration) of ions Nernst equation: E = E0 - (0.059/n) × ln (Cion) As the Nernst equation is derived entirely from thermodynamics, the Pourbaix diagram can be used to determine which species (metals or alloys) is thermodynamically stable at a given electrode potential (E) and pH. Pourbaix diagrams are plotted by using the Nernst equation (an equation used to calculate electrode potential). ![]()
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