STUDY ON CORROSION AND INHIBITION MECHANISM IN H2S AQUEOUS SOLUTIONSⅤ.The Inhibition Characteristics of Imidazoline Derivatives in H2S Solutions

J Chin Soc Corr Pro

2001, Vol. 21

Issue (6): 321-327 DOI:

Research Report

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STUDY ON CORROSION AND INHIBITION MECHANISM IN H2S AQUEOUS SOLUTIONSⅤ.The Inhibition Characteristics of Imidazoline Derivatives in H2S Solutions

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Abstract A series imidazoline derivatives, which have differ en t molecular structure and function group, were synthesized and investigated resp ectively for the inhibition characteristics, the effect of temperature on the in hibition efficiency by potentiodynamic polarization curve and electrochemical im pedance spectroscopy (EIS) in H2S solutions. The results show that imidazoline derivatives have a good inhibition to the mild steel in H2S solutions, that i s strongly dependent on the chemical interaction between imidazoline molecule and the surface of metals. When the number of carbon atom in hydrophobic side chain is less than 13 and there are some function groups (such as double-bond; hydroxy l) in hydrophobic side chain, the employed imidazoline compounds present anodic inhibitor's performance, whereas the compounds present cathodic type inhibitor' s performance when the number of carbon atom in hydrophobic side chain is more t han 13. The length of side chains (including hydrophobic and hydrophilic chain) and the different function groups (such as double-bond; hydroxyl) in imidazoline ring play an important role in the inhibition performance and mechanism.

Key words: imidazoline derivatives inhibitors H2S corrosion

Received: 30 October 2000

ZTFLH:

TG174.42

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. STUDY ON CORROSION AND INHIBITION MECHANISM IN H2S AQUEOUS SOLUTIONSⅤ.The Inhibition Characteristics of Imidazoline Derivatives in H2S Solutions. J Chin Soc Corr Pro, 2001, 21(6): 321-327 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2001/V21/I6/321

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