The aim of this paper is to investigate the feasibility of monitoring corrosion processes by means of electrochemical impedance and noise measurements in paraffin oil/brine mixtures of various compositions between 0 and 80 % in volume of oil. Results have shown that the electrolyte resistance fluctuations are a highly sensitive and reliable tool conveying real-time information about the flow characteristics - flow pattern and electrolyte composition – and hence, in an indirect way, about the environment aggressiveness. On the other hand, in this two-phase system, in which the state of the metallic surface can be strongly heterogeneous and in constant change, conventional electrochemical current and/or potential noise, as well as electrochemical impedance measurements, show very poor reproducibility and weak sensitivity to detect both corrosion processes and flow changes. Drawbacks related to the choice of the controlling device are discussed.

Subject
Flow patterns, Droplets, Composition, Electrochemical noise, Paraffin, Mixtures, Hydrodynamics, Impedance measurements, Electrodes, Corrosion potential, Electrolytes, Electrode potential, Oil
Keywords:
electrochemical noise, electrolyte resistance, conductivity, oil/water, two-phase flow, monitoring
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
2004
GOV
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