Abstract
Preferential Zn-dissolution from ε-brass under potentiostatic control is observed to occur in two different modes. At low electrode potentials a diffusion controlled phase transformation primarily generates a plane, nonporous layer of γ-brass. At high overvoltage a reaction zone of Cu (or Cu-rich α-phase) proceeds into the alloy, apparently due to a tunnel nucleation and propagation process, i. e. by a change of the dissolution mechanism. This result is corroborated by potential step experiments, showing the occurence of both dissolution morphologies in dependence of the prevailing overvoltage.
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