Citation: ZHENG Lei-Gang, YANG Huai-Yu. Influence of Organic Inhibitors on the Corrosion Behavior of Steel Rebar insideMortar Specimens Immersed in Saturated NaCl Solution[J]. Acta Physico-Chimica Sinica, ;2010, 26(09): 2354-2360. doi: 10.3866/PKU.WHXB20100905 shu

Influence of Organic Inhibitors on the Corrosion Behavior of Steel Rebar insideMortar Specimens Immersed in Saturated NaCl Solution

1.
State key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China

Received Date: 29 March 2010
Available Online: 8 July 2010
Fund Project: 国家科技支撑计划(2007BAB27B03)资助项目 (2007BAB27B03)

The long-term effects of four kinds of amine-alcohol based inhibitors on the corrosion behavior of steel rebar inside mortar specimens immersed in saturated NaCl solution were studied by electrochemical impendence spectroscopy (EIS), half cell corrosion potential (E_corr), and macrocell corrosion current density (I_corr) measurements. We found that the E_corr and the impedance modulus were higher than those in the control specimen after inhibitor addition. Additionally, I_corr decreased over the initial 100 d of immersion revealing that the steel rebar electrodes are kept in passive state and the inhibitors showed od inhibition effects. With an increase in the immersion time, E_corr and the impedance modulus for all the inhibited mortar specimens decreased while I_corr increased. After immersion for 125 d there were no obvious differences between E_corr and I_corr for the inhibited systems by comparison to those in the blank sample, except for the specimen containing CI-4. This suggests that the surface of the electrode changes from passive state to active state. The best inhibition was obtained in the presence of the CI-4 inhibitor. We briefly discuss the inhibition mechanismbased on the competitive adsorption of the inhibitor molecules with Cl^- on the steel rebar surface.
- Corrosion inhibitor,
- Protection of steel rebar,
- Local corrosion induced by Cl-,
- Electrochemical technique
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