Abstract
Relatively little information is available on corrosion of materials in marine environment under the influence of AC fields. In this study, corrosion caused by sinusoidal alternating voltage (AV) fields in 1018 carbon steel is investigated by: (i) immersion tests and (ii) characterization of corrosion products. The experimental data show that under the influence of alternating voltage (60 Hz) applied between carbon steel and a platinum mesh counter electrode, the corrosion rate of the carbon steel increases with the applied voltage then decreases as the peak voltage amplitude is increased in the range 100–600 mV. With a further increase in the voltage amplitude beyond 600 mV, the corrosion rate is observed to increase exponentially. It is speculated that the decrease in the corrosion rate is related to a passivation phenomena brought about by an increase in the pH of the diffusion layer. The influence of the pH on the carbon steel corrosion properties is also investigated. The effect of frequency of AV signal on corrosion rate is also determined and discussed.
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