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Acta Physico-Chimica Sinica  2011, Vol. 27 Issue (03): 647-654    DOI: 10.3866/PKU.WHXB20110315
ELECTROCHEMISTRY AND NEW ENERGY     
Corrosion Inhibition by Sorbitol/Diethylenetriamine Condensation Product for Carbon Steel in 3.5% NaCl Saturated Ca(OH)2 Solution
ZHOU Xin1,2, YANG Huai-Yu1, WANG Fu-Hui1
1State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China; 2Department of Metallurgic Engineering, Liaoning Institute of Science and Technology, Benxi 117022, Liaoning Province, P. R. China
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Abstract  

The inhibitive action of a sorbitol/diethylenetriamine condensation (SDC) product toward carbon steel corrosion in saturated Ca(OH)2 solution containing 3.5% NaCl was investigated using potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), surface morphological observations, and quantum chemical calculations. The results indicate that the addition of SDC can effectively decrease the corrosion current densities of the carbon steel and increase the pitting corrosion potential suggesting that the local corrosion induced by Cl- is strongly restricted by the inhibitor, which acts as a mixed type inhibitor. In the studied concentration range, the inhibition efficiency increased with an increase in inhibitor concentration. The overall inhibition behavior of SDC is attributed to the stabile adsorption film formd by the dominantly physical adsorption on the carbon steel surface according to the Langmuir adsorption isotherm.



Key wordsCorrosion inhibitor      Protection of steel rebar      Inhibition effect      Adsorption behavior     
Received: 21 September 2010      Published: 28 January 2011
MSC2000:  O646  
  TG 174  
Fund:  

The project was supported by the National Key Technology Research and Development Program, China (2007BAB27B03).

Corresponding Authors: YANG Huai-Yu     E-mail: Hyyang@imr.ac.cn
Cite this article:

ZHOU Xin, YANG Huai-Yu, WANG Fu-Hui. Corrosion Inhibition by Sorbitol/Diethylenetriamine Condensation Product for Carbon Steel in 3.5% NaCl Saturated Ca(OH)2 Solution. Acta Physico-Chimica Sinica, 2011, 27(03): 647-654.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20110315     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2011/V27/I03/647

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