The evaluation of corrosion inhibitor film persistency using electrochemical impedance spectroscopy and electrochemical noise analysis
- Curtin Univ. of Technology, Perth, Western Australia (Australia)
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 CO{sub 2} corrosion. It was found that the inhibitors film deterioration was accompanied by typical changes in the EIS spectra, which could be used as indicators for monitoring inhibitor film breakdown. ENA was shown to be able to continuously follow and monitor the inhibitor film deterioration processes. The noise resistance (R{sub noise}) was confirmed to be strongly correlated to linear polarization resistance (R{sub p}) and this correlation was explained based on a concept called statistical linear polarization. The presence of the hydrocarbon phase and CO{sub 2} corrosion product scale were found to be factors which greatly affect batch treatment inhibitor film persistency.
- OSTI ID:
- 367738
- Report Number(s):
- CONF-960389--
- Country of Publication:
- United States
- Language:
- English
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