Abstract
The kinetics of anodic iron dissolution and cathodic hydrogen evolution have been studied during the corrosion of four grades of iron: zone‐refined, iron with 0.5 Mn (a/o) or 0.15 Ti added, and Ferrovac E. The titanium, which caused second‐phase particles to accumulate on the surface, and manganese had little effect on iron‐dissolution rates, but both additions inhibited hydrogen evolution significantly. Zone‐refined iron yielded constant Tafel slopes: , . Impurities caused ba and bc to drift to more positive values during corrosion. A new method of analyzing anodic transients is recommended, and this analysis shows that the usual steady‐state polarization curve is an unreliable indicator of reaction mechanism.
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