C. Andrade et al., THE IMPORTANCE OF GEOMETRICAL CONSIDERATIONS IN THE MEASUREMENT OF STEEL CORROSION IN CONCRETE BY MEANS OF AC-IMPEDANCE, Corrosion science, 37(12), 1995, pp. 2013-2023
The measurement of electrochemical impedance is widely used not only f
or corrosion studies, but also for studying a high variety of electroc
hemical processes. Either two electrode or three electrode systems are
used in very different arrangements in these measurements. In the pre
sent paper, some results and comments are presented on how different g
eometrical dispositions of the electrodes may affect the results so mu
ch, which is one of the reasons that makes the comparison between them
more difficult. It is well known that the capacitance is electrode-ge
ometry-dependent, as is the electrical resistance. Therefore, the dist
ance between the electrodes and their size and location in the cell wi
ll affect the characteristic frequency response. As in the case of ine
rt capacitors, only well defined geometrical arrangements will enable
the calculation of comparable capacitance Values when the study of the
concrete is attempted.