Seven homologous imidazoline inhibitors, the derivatives of cyclopentylic and cyclohexylonaphthenic acids, have been synthesised. The effectiveness of these inhibitors for St3S steel and 1H18N9T austenitic stainless steel was tested using the impedance method in solutions of 2 wt-%NaCl, 2 wt-%NH4Cl, and 2 wt-%HCl in the presence of a hydrocarbon phase (gasoline). The solution was saturated with hydrogen sulphide. It was found that the inhibitors and their mixtures displayed high inhibition efficiencies, reaching 93% for carbon steel and 94% for the austenitic steel. Inhibitors with the shortest hydrocarbon side chains on the imidazoline ring were found to offer the lowest level of protection, the inhibition efficiency increasing with the length of the side chain. The capacitance measured on the surface decreased linearly as the coverage of the steel surface by inhibitor increased. The results of impedance measurements with commercial inhibitors have confirmed the conclusions form the tests on the pure chemical species.


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    Title :

    Impedance study of imidazoline inhibitors against hydrogen sulphide corrosion of steel


    Additional title:

    Impedanzmessung von Imidazolin-Inhibitoren gegen die Schwefelwasserstoffkorrosion von Stahl


    Contributors:

    Published in:

    British Corrosion Journal ; 37 , 2 ; 141-146


    Publication date :

    2002


    Size :

    6 Seiten, 6 Bilder, 7 Tabellen, 24 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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