Investigation of the Oscillatory Electrodissolutionof the Nickel–Iron Alloy

Among many chemical systems displaying oscillatory behavior, the anodic dissolution of transition metals is considered one of the first, with the reports dating from as early as 1828. Since then, electrochemical oscillators have been studied as single or in a multielectrode configuration coupled under different network topologies. The coupling is basically made up of electrical connections between the electrodes, keeping them far apart from each other in such a way that only electric coupling is present. Here, we report experimental studies of the coupling between two electrochemical oscillators, namely the oscillatory corrosion of Ni and Fe, not as two separated electrodes, but as in the form of an alloy. The phenomenon is described in terms of stationary and dynamic electrochemical techniques as well as a bifurcation diagram, depicting the region of a Rext vs. E plane, in which the oscillations are found. Also, a plot with the rate of the electrode potential change was calculated, which revealed the sep...