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Electrochemical stability of embeddable MnO2/Mn reference electrode and its AC impedance behavior

SHUANG LU1,* , HENGJING BA1, YINGZI YANG1

Affiliation

  1. School of Civil Engineering, Harbin Institute of Technology, Xidazhi Street 66, P.O. Box 1430, 150006 Harbin, P R China

Abstract

A novel embeddable MnO2/Mn reference electrode for corrosion monitoring is mainly prepared from a mixture of β type manganese dioxide and manganese by high-pressure molding in laboratory. The long-term electrochemical stability of electrodes was studied in cement mortar. AC impedance behavior of the MnO2/Mn reference electrode was examined in synthetic concrete pore solutions after that. The long-term potentiometric measurements showed good stability and no apparent potential drift within 90 days continuous measurement. The electrochemical stability of MnO2/Mn reference electrode is related to equilibrium established by double-phase oxides MnO2 and MnOx (1≤x<1.5). AC impedance behavior verified that the fabricated reference electrodes were sufficient to meet the requirement for corrosion monitoring in concrete environment..

Keywords

Embeddable, MnO2, Manganese, AC impedance, Concrete, Electrochemical.

Citation

SHUANG LU, HENGJING BA, YINGZI YANG, Electrochemical stability of embeddable MnO2/Mn reference electrode and its AC impedance behavior, Optoelectronics and Advanced Materials - Rapid Communications, 4, 2, February 2010, pp.190-193 (2010).

Submitted at: Dec. 1, 2009

Accepted at: Feb. 2, 2010