STUDY ON CORROSION AND INHIBITION MECHANISM IN H2S AQUEOUS SOLUTIONSⅥ.The Relationship between Molecular Structure of ImidazolineDerivatives and Inhibition Performance in H2S Solutions

J Chin Soc Corr Pro

2002, Vol. 22

Issue (3): 148-152 DOI:

Research Report

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STUDY ON CORROSION AND INHIBITION MECHANISM IN H2S AQUEOUS SOLUTIONSⅥ.The Relationship between Molecular Structure of ImidazolineDerivatives and Inhibition Performance in H2S Solutions

Huaiyu Yang;Jiajian Chen;Chunan Cao

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 relationship between molecular structure of imi dazoline derivatives and inhibition performance was investigated by weight loss me thod，potentiodynamic polarization curve and electrochemical impedance spectrosc opy (EIS) in H2S solutions.Result show that the side chains，which occupies 1 or 2 sites on the central five membered ring and has hydrophobic or hydrophilic properties，and some active functional groups have an important effect on the in hibition performance of imidazoline derivatives.Compounds studied have the best in hibitive efficiency when the hydrophobic side chain contains either seven or sev enteen carbon atoms，and the best inhibitive efficiency when the hydrophilic sid e chain contains two aminoethylenes.The double bond in the hydrophobic side cha in and the thiourea group in the hydrophilic side chain can effectively enhance inhibitive performance，nor can the hydroxyl group in the hydrophobic chain.Alth ough the inhibitive performance of imidazoline derivates can be improved through changing the central imidazoline ring chemistry，they do not suit to use as in hibitor because of the poor solubility.

Key words: molecular structure imidazoline inhibition H2S cor rosion

Received: 30 October 2000

ZTFLH:

TG174.42

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Huaiyu Yang; Jiajian Chen; Chunan Cao. STUDY ON CORROSION AND INHIBITION MECHANISM IN H2S AQUEOUS SOLUTIONSⅥ.The Relationship between Molecular Structure of ImidazolineDerivatives and Inhibition Performance in H2S Solutions. J Chin Soc Corr Pro, 2002, 22(3): 148-152 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2002/V22/I3/148

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