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96352 The Evaluation of Corrosion Inhibitor Film Persistency Using Electrochemical Impedance Spectroscopy and Electrochemical Noise Analysis

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Product Number: 51300-96352-SG
ISBN: 96352 1996 CP
Author: Y. J. Tan, B. Kinsella, S. Bailey
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Electrochemical impedance spectroscopy (EIS) and electrochemical noise analysis (ENA) were used as combined techniques to study and evaluate the film persistency of several commercial batch treatment inhibitors which are used for protecting oil-wells, gas-wells or pipelines from CO2 corrosion. It was found that the inhibitor film deterioration was accompanied by typical changes in the EIS spectra, which could be used as indicators Cormonitoring inhibitor film breakdown. ENA was shown to be able to continuously follow and monitor the inhibitor film deterioration processes. The noise resistance (Rnoise) was confirmed to be strongly correlated to linear polarisation resistance (Rp) and this correlation was explained based on a concept called statistical linear polarisation. The presence of the hydrocarbon phase and CO2 corrosion product scale were found to be factors which greatly affect batch treatment inhibitor film persistency. KeyWords: CO2 corrosion, inhibitor, inhibitcm film persistency, electrochemical impedance spectroscopy, electrochemical noise analysis
Electrochemical impedance spectroscopy (EIS) and electrochemical noise analysis (ENA) were used as combined techniques to study and evaluate the film persistency of several commercial batch treatment inhibitors which are used for protecting oil-wells, gas-wells or pipelines from CO2 corrosion. It was found that the inhibitor film deterioration was accompanied by typical changes in the EIS spectra, which could be used as indicators Cormonitoring inhibitor film breakdown. ENA was shown to be able to continuously follow and monitor the inhibitor film deterioration processes. The noise resistance (Rnoise) was confirmed to be strongly correlated to linear polarisation resistance (Rp) and this correlation was explained based on a concept called statistical linear polarisation. The presence of the hydrocarbon phase and CO2 corrosion product scale were found to be factors which greatly affect batch treatment inhibitor film persistency. KeyWords: CO2 corrosion, inhibitor, inhibitcm film persistency, electrochemical impedance spectroscopy, electrochemical noise analysis
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