The Corrosion Inhibition of 2-Undecyl-N-Carboxymethyl-N-Hydroxyethyl Imidazoline on Carbon Steel in Citric Acid Solution

doi:10.3724/SP.J.1095.2011.00270

Chinese Journal of Applied Chemistry ›› 2011, Vol. 28 ›› Issue (03): 314-319.DOI: 10.3724/SP.J.1095.2011.00270

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The Corrosion Inhibition of 2-Undecyl-N-Carboxymethyl-N-Hydroxyethyl Imidazoline on Carbon Steel in Citric Acid Solution

LIAO Qiang-Qiang^1*, CHEN Ya-Qiong¹, YAN Ai-Jun², DONG Wan-Tian³, GE Hong-Hua¹

(1.Key Laboratory of Shanghai Colleges and Universities for Electric Power Corrosion 
Control and Applied Electrochemistry,Shanghai Engineering Research Center of Energy-Saving 
in Heat Exchange Systems,Shanghai University of Electric Power, Shanghai 200090；
2.Shaanxi Electric Power Science Research Institute，Xi′an;
3.Shanghai Fakai Chemical Industry Co Ltd,Shanghai)

Received:2010-05-10 Revised:2010-07-02 Published:2011-03-10 Online:2011-03-10

Abstract

Abstract:

2-Undecyl-N-carboxymethyl-N-hydroxyethyl imidazoline was investigated as a corrosion inhibitor for carbon steel in 2% mass fracton of citric acid solution by means of mass loss test, polarization and AC impedance. The mass loss test results showed that the inhibitor was an excellent inhibitor for carbon steel in acid media with an inhibition efficiency of 86.4% at the mass concentration of 0.4%. The polarization curves indicated that the inhibitor behaved as a mixed type inhibitor while the single capacitive loop in the Nyquist plots revealed that the corrosion was a charge transfer controlled process. The adsorption of the inhibitor was found to follow the Langmuir adsorption isotherm and the involved mechanism consisted of a mixed adsorption between chemisorption and physisorption.

Key words: imidazoline, corrosion inhibitor, citric acid, carbon steel

CLC Number:

O646.1

LIAO Qiang-Qiang1*, CHEN Ya-Qiong1, YAN Ai-Jun2, DONG Wan-Tian3, GE Hong-Hua1. The Corrosion Inhibition of 2-Undecyl-N-Carboxymethyl-N-Hydroxyethyl Imidazoline on Carbon Steel in Citric Acid Solution[J]. Chinese Journal of Applied Chemistry, 2011, 28(03): 314-319.

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The Corrosion Inhibition of 2-Undecyl-N-Carboxymethyl-N-Hydroxyethyl Imidazoline on Carbon Steel in Citric Acid Solution

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