Study on Corrosion and Inhibition Mechanism in H2S Aqueous Solutions 1.Corrosion Behavior of Carbon Steel and Growth of Sulfide Film on It in Acidic Solutions Containing H2S

J Chin Soc Corr Pro

2000, Vol. 20

Issue (1): 1-7 DOI:

Research Report

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Study on Corrosion and Inhibition Mechanism in H2S Aqueous Solutions 1.Corrosion Behavior of Carbon Steel and Growth of Sulfide Film on It in Acidic 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 The electrochemical behavior of low carbon steel corroding in acidic simulation solutions containing H2S was investigated by electrochemical impedance spectroscopy , potentiodynamic polarization curves and observations of SEM and ADEX. The results showed that the cathodic depolarization was enhanced greatly by H+ ionized from H2S under stirring or static condition. Corrosion rate decreased with increasing pH within the investigated pH range. The transfer resistance (Rt) initially increased with immersion time up to about 8h, but then decreased sharply. At the initial stage of corrosion, the growth of sulfide film on the electrode suface abided by parabolic law, but after longer immersion, the sulfide film became loose, easily cracked and sloughed off, furthermore, the second growth of film arose. Finally, the growth of film was balanced by its dissolution in solution. Sulfide film formed under test condition was not protective enough for carbon steel.

Key words: EIS potentiodynamic polarization H2S corrosion sulfide film

Received: 04 January 1999

ZTFLH:

TG172

Corresponding Authors: Huiyu Yang

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Huiyu Yang. Study on Corrosion and Inhibition Mechanism in H2S Aqueous Solutions 1.Corrosion Behavior of Carbon Steel and Growth of Sulfide Film on It in Acidic Solutions Containing H2S. J Chin Soc Corr Pro, 2000, 20(1): 1-7 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2000/V20/I1/1

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