polarization behavior of the anodic and cathodic reactions. Rather, the effect was of a chemical nature, and AV caused a profound change in the mechanism of iron dissolution and film formation processes in chlorate solution. It is suggested that further studies be undertaken to resolve the problem. ConclusionsA study has been made of the effect of alternating voltage (AV) on the polarization of mild steel in neutral sodium sulfate, nitrate, perchlorate, and chlorate solutions. The types of AV used were 60 Hz sinusoidal, square, and triangular waves, and the measurements were carried out for a range of AV from O to 2000 mV rms. Based upon the experimental results, the following conclusions could be made:1. AV caused a shift in the corrosion potential toward the negative direction for mild steel in sulfate, nitrate, and perchlorate solutions. In chlorate solution, the corrosion potential was shifted toward the positive direction.2. AV behaved as a depolarizer and substantially increased d-c current densities in the active and the transpassive regions of the polarization curves.3. In the passive region, AV destroyed the passivity and increased the passivity current density by one to two orders of magnitude for mild steel in sulfate, nitrate, and perchlorate solutions. In chlorate solution, AV prevented the formation of oxide film on the electrode, and completely eliminated the passive region in the polarization measurements.4. At high AV values, two distinct active-to-passive transitional potentials were observed for mild steel in nitrate and perchlorate solutions.5. The effects of various AV waveforms were qualitatively similar for all the solutions investigated. Triangular wave caused the severest destruction of pas-sivity in the passive region; whereas square wave caused the highest increase in d-c current in the active and the transpassive regions.6. A simple mathematical model was used for the computer simulation of the polarization behavior of the mild steel electrode under the superimposed AV conditions. The simulated curves agreed qualitatively with the experimental curves for sulfate, nitrate, and perchlorate solutions.
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