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| Study on Corrosion and Inhibition Mechanism in H2S Aqueous Solutions 3.Electrochemical Behavior of Carbon Steel in the Different pH Solutions Containing H2S |
| Huiyu Yang;;; |
| 中科院金属所金属腐蚀与防护国家重点实验室 |
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Abstract Electrochemical behavior of carbon steel in the simulated solutions containing H2S at different pH values have been investigated by potentiodynamic polarization curves and electrochemical impedance spectroscopy(EIS). The results indicated that at lower pH value, the electrode process of carbon steel was mainly controlled by anodic dissolution, the Nyquist diagrams were composed of a capacitive loop at high frequency and an inductive loop at the low frequency. With the increase in pH, the corrosion potential of carbon steel became more negative, as well as corrosion current density decreased. These changes could be attributed to the increase in pH and coverage of iron sulfide film, but a higher corrosion current was observed at pH 6.2, which was attributed to the depolarization of HS- in cathodic process. When the pH was higher than 7, the surface of corroding electrodes got into the stage of passivation because of the formation of iron oxide film. Based on the view of competitive adsorption between HS- and OH- on surface electrode, a probable reaction mechanism was suggested.
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Received: 18 January 1999
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Corresponding Authors:
Huiyu Yang
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