Abstract
The role of chloride ions on the current oscillations of relaxation type at the transition of iron between the active and passive states in sulphuric acid solutions is investigated. Pitting corrosion occurs in the presence of chloride ions. The periodic relaxation oscillations observed in the absence of chloride become aperiodic and finally disappear under stationary conditions of the Fe disc electrode in the presence of chloride. However, under rotational conditions, quasiperiodic and chaotic oscillations are observed upon gradually increasing the chloride additions. The rich dynamical response of the system Fe/2M H 2SO 4 + x M Cl −, under various conditions of chloride concentrations, electrode rotation and potential has been characterized by using the current—time series and power spectra. Examples of quasiperiodicity and chaos are given.
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