Abstract
A simple experimental method is suggested to characterise the electrode reactions of metals in an electrolytic solution in order to plot the actual corrosion state of metals in the E–pH plane. The present approach is based on measurement of the composition (in particular the pH) of the near surface layer and not on the bulk solution by application of a partition cell and simultaneous measurement of the current and application of a new approach to separate the anodic (dissolution) and cathodic currents. The resistance of the metal to corrosion is deduced from the actual dissolution current. A corrosion diagram of several metals and of the Fe–Cr binary alloy system is constructed to illustrate the potential applications of the method.
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