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Citation: LIAO Qiangqiang, CHEN Yaqiong, YAN Aijun, DONG Wantian, GE Honghua. 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(3): 314-319. doi: 10.3724/SP.J.1095.2011.00270 shu

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

1.
a 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.
b Shaanxi Electric Power Science Research Institute, Xi'an;
3.
c Shanghai Fakai Chemical Industry Co Ltd, Shanghai

Corresponding author: LIAO Qiangqiang,
Received Date: 10 May 2010
Available Online: 2 July 2010
Fund Project: 上海市重点学科建设项目(P1304) (P1304)上海高校电力腐蚀控制与应用电化学重点实验室开放基金资助项目(09KLSU01) (09KLSU01)上海热交换系统节能工程技术研究中心开放基金资助项目(09SERC03) (09SERC03)上海市科委项目资助课题(08DZ2210800) (08DZ2210800)

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.
- imidazoline,
- corrosion inhibitor,
- citric acid,
- carbon steel
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