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The corrosion inhibitory property of N,N-bis(2-benzimidazolylmethyl)amine for Q235 steel

Authors

  • J. H. Qian,

    Corresponding author
    1. Key Laboratory of Synthesis and Application of Functional Compounds of Liaoning Province, Bohai University, Jinzhou 121000 (P.R. China)
    • Key Laboratory of Synthesis and Application of Functional Compounds of Liaoning Province, Bohai University, Jinzhou 121000 (P.R. China).
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  • Y. Zhang,

    1. Key Laboratory of Synthesis and Application of Functional Compounds of Liaoning Province, Bohai University, Jinzhou 121000 (P.R. China)
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  • X. Y. Yin,

    1. Key Laboratory of Synthesis and Application of Functional Compounds of Liaoning Province, Bohai University, Jinzhou 121000 (P.R. China)
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  • L. Liu

    1. Key Laboratory of Synthesis and Application of Functional Compounds of Liaoning Province, Bohai University, Jinzhou 121000 (P.R. China)
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Abstract

The main purpose of this paper is to systematically evaluate the anti-corrosion property of N,N-bis(2-benzimidazolylmethyl)amine (IDB), which is a novel good thermal stabilized inhibitor in acidic medium. Results obtained from electrochemical tests and corrosion surface morphology analyses reveal that IDB performs excellently as corrosion inhibitor for Q235 steel in 1 mol/L hydrochloric acid corrosive solution. Potentiodynamic polarization measurements show that IDB inhibits both the anodic and cathodic processes of corrosion and exhibits as a mixed-type inhibitor. Besides, the inhibiting efficiency (IE%) and consequently the degree of surface coverage (θ) increase with the inhibitor concentration rising. And when the concentration is 20 × 10−5 mol/L, the corrosion inhibition effect is best to reach 96.39%. The adsorption of inhibitor on Q235 steel is found to obey the Langmuir adsorption isotherm, and the calculated Gibbs free energy demonstrates that IDB spontaneously adsorbs and forms a protective chemisorbed film on Q235 steel to restrain its corrosion. Hereby, IDB will become a promising corrosion inhibitor in further.

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