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| Study on Corrosion and Inhibition Mechanism in H2S Aqueous Solutions 2.Passivity and Passive Flim Vreakdown of Carbon Steel under Anodic Polarization in Alkaline 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 Passivity and passive film breakdown of carbon steel in alkaline solutions containing H2S under anodic polarization have been investigated by electrochemical impedance spectoscopy. The results indicated that at the same pH value, the passivity of carbon steel in alkaline solutions is promoted by the addition of H2S. The Nyquist diagrams were composed of two capacitive loops at the initial stage of passivation, with increasing anodic polarization potential, the capacitive loop at high frequency disappeared, the carbon steel specimen got into the stage of passivation. At potentials higher than -690mV, HS- might he adsorbed on the surface of electrodes through competition with OH-, Furthermore, the passive film began to dissolve dur to the formation of ferric sulfide patches and the decrease in pH in and round the passive film faults caused by the oxidation of HS- adsorbed. When the ptential reached -635mV, the passive film was entirely brokendown.
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Received: 04 January 1999
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Corresponding Authors:
Huiyu Yang
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Cite this article:
Huiyu Yang. Study on Corrosion and Inhibition Mechanism in H2S Aqueous Solutions 2.Passivity and Passive Flim Vreakdown of Carbon Steel under Anodic Polarization in Alkaline Solutions Containing H2S. J Chin Soc Corr Pro, 2000, 20(1): 8-14 .
URL:
https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2000/V20/I1/8
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