Hello everyone,
I'm currently studying steel bars embedded in concrete and conducting electrochemical measurements to analyze their corrosion behavior. I have used Linear Polarization Resistance (LRP) and Electrochemical Impedance Spectroscopy (EIS) techniques to measure the polarization resistance. However, I have noticed that the results obtained from these two methods are different, especially when the current corrosion density is low or when the system is in a passive state.
Has anyone encountered similar discrepancies in their research? I would greatly appreciate any insights or suggestions regarding the potential reasons behind this discrepancy. Additionally, if you have any recommendations on alternative techniques or approaches to accurately measure polarization resistance in such conditions, I would love to hear your experiences.
Thank you in advance for your help
if the differences are less than an order of magnitude, they're probably not significant. eg 0.7, 0.5 and 1 are all basically the same, and 5 7 and 10 would be a significant difference. its tempting to quote the figures to multiple decimal places, but its probably not that meaningful. EIS is a good way of generating data, but most of the graphs I've seen on concrete are dominated by diffusion anyway. When steel is passive by definition its very easy to polarise, so small applied currents give big shifts in potential, which can aggravate the magnitude of noise.
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