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| CHARACTERISTICS OF ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY FOR X100 PIPELINE STEEL IN WATER-SATURATED ACIDIC SOIL |
| LI Chao1,2, DU Cuiwei2, LIU Zhiyong2, LI Xiaogang2 |
1. Qingdao Research Institute for Marine Corrosion, Central Institute for Iron and Steel, Qingdao 266071；
2. Corrosion and Protection Center, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 |
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Abstract The electrochemical impedance spectroscopy (EIS) of X100 steel in water-saturated acidic soil was studied. The results show that pitting corrosion occured after soak in Yingtan saturated soil water for 104 hours, and the Nyquist diagram had two time constants, a capacitive loop at high frequency represented the reaction, and an inductive loop at the low frequency for representing adsorption or the pitting nucleation period of the inductance. Diffusion control results in the increasing of impedance because of low media conductivity during the initial corrosion period. The accumulation of corrosion products on the electrode surface hinders proliferation of reactive ions which also can result in impedance increasing with the test time. The corrosion scale is porous and forms activated regions which result in the decrease of impedance. Concentration of harmful Cl - in the corrosion products initiates localized pitting and brings reactance.
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Received: 08 July 2010
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Corresponding Authors:
LI Chao
E-mail: tsbx1215@yahoo.com.cn
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