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99027 COMPARISON OF CORROSION MEASUREMENTS BY USE OF AC-IMPEDANCE, LPR AND POLARIZATION METHODS ON CARBON STEELIN CO2 PURGED NACL ELECTROLYTES

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Product Number: 51300-99027-SG
ISBN: 99027 1999 CP
Author: N.O.Aagotnes, T.Hernmingsenl, C. Haarseth , I. Midttveit
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Comparative measurements are performed on carbon steel in CO2 purged and aerated sodium chloride solutions at different salinities on rotated and stationary electrodes. The results from the use of the AC-Impedance measuring technique are compared with more traditional techniques like Linear Polarization Resistance (LPR) and Polarization using Tafel equations. Electron microscope analyses were obtained to monitor the film formation rate and to facilitate the comparison of the results from the use of the AC-impedance technique. Generally, corrosion in the CO2 environment was higher than in the aerated solutions, but when the electrodes were rotated, a protective carbonate film was formed which gave a decrease in corrosion rate. Generally, corrosion rates horn AC-impedance measurements gave higher results than the rates from LPR-measurements. High electrolyte resistance (R,), i.e. low salinity and low polarization resistance (RP), in AC-impedance measurements caused high deviation from the LPR-results.
Comparative measurements are performed on carbon steel in CO2 purged and aerated sodium chloride solutions at different salinities on rotated and stationary electrodes. The results from the use of the AC-Impedance measuring technique are compared with more traditional techniques like Linear Polarization Resistance (LPR) and Polarization using Tafel equations. Electron microscope analyses were obtained to monitor the film formation rate and to facilitate the comparison of the results from the use of the AC-impedance technique. Generally, corrosion in the CO2 environment was higher than in the aerated solutions, but when the electrodes were rotated, a protective carbonate film was formed which gave a decrease in corrosion rate. Generally, corrosion rates horn AC-impedance measurements gave higher results than the rates from LPR-measurements. High electrolyte resistance (R,), i.e. low salinity and low polarization resistance (RP), in AC-impedance measurements caused high deviation from the LPR-results.
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