Abstract
This paper compares the cathodic reactions occurring on steel in aqueous solution containing dissolved H2S or CO2. In aqueous solutions containing these weak acids, the rate of the cathodic reaction is enhanced in comparison with strong acid solutions at the same pH. In the case of dissolved CO2, this phenomenon is fully explained by a buffer effect, contributing to the transport of proton at the steel surface. In the case of H2S containing solutions, this chemical mechanism is no more sufficient to explain the cathodic polarization curves. An additional electrochemical reaction is clearly observed, with strong links with H2S concentration.
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