AMENDING THE POLARIZATION CURVES OF THE Q345 IN NaHCO3SOLUTION THROUGH THE METHOD OF EQUIDISTANCE VOLTAGE

J Chin Soc Corr Pro

2009, Vol. 29

Issue (3): 167-171 DOI:

技术报告

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AMENDING THE POLARIZATION CURVES OF THE Q345 IN NaHCO₃SOLUTION THROUGH THE METHOD OF EQUIDISTANCE VOLTAGE

NIE Xianghui; DU Cuiwei; LI Xiaogang

Center of Corrosion and Protection; School of Materials Science and Engineering; University of Science and Technology Beijing; Beijing 100083

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Abstract

The polarization curves of the Q345 were measured in NaHCO₃ solution, and the concentration is 6 mmol/L, 3 mmol/L and 1.5 mmol/L respectively. The anodic polarization curves were amended by means of equidistance voltage. By this way, the influence of the solution resistance to the measurement was eliminated. By the modified results, the kinetic parameters, such as b_a and I_corrcould be got easily. Comparing with the results from EIS, under the effect of the polarization, because of the shifting of the iron
concentration near the electrode surface and the movement speed of the ions is much fast under the effect of the electric field ,solution resistance is less than the resistance at the corrosion potential. Furthermore, the R_sol that calculated by the method of equidistance voltage is reasonable for the calculation range, but it can not be extended to the whole range of the measurement. Otherwise, a big error will be aroused. Being the effect of diffusion process, this method is not suitable for cathodal course.

Key words: solution resistance polarization curve the method of equidistance voltage

Received: 16 October 2007

ZTFLH:

TG172.5

Corresponding Authors: LI Xiaogang E-mail: lixiaogang99@263.net

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Cite this article:

NIE Xianghui DU Cuiwei LI Xiaogang. AMENDING THE POLARIZATION CURVES OF THE Q345 IN NaHCO₃SOLUTION THROUGH THE METHOD OF EQUIDISTANCE VOLTAGE. J Chin Soc Corr Pro, 2009, 29(3): 167-171.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2009/V29/I3/167

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