During the period of 10 months of partial immersion of samples in the NaCl solution, the potential still continues to be at low performance considering the corrosion, according to ASTM C876, which may imply passivation of the hollow steel bar, although the above notice alone cannot be considered as decisive evidence of the passive state of the hollow steel bar.
It is important to highlight that the potential oscillation is result from drying/immersion cycles, in aother words, in speaking of concrete humidity.
When the
hollow steel bar surface is humidified, a decrease in the resistivity happens, improving the current flow and changing the potential values.
The consequences obtained by OPC were indentified in the EIS, by Nyquist and Bode diagrams. The Nyquist complex plane graph is a plot of the resistive Zreal against the capacitive Zimag, while Bode diagrams are plots of the logarithm of the impedance modulus Z and phase angle against the logarithm of frequency.
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