10162 Electrochemical Evaluation of Corrosion Inhibitors in CO2 Contining Brines, an RCE and Flow-Loop Comparison

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Product Number: 51300-10162-SG

ISBN: 10162 2010 CP

Author: Juan Genesca, Nora Balderas, Armando Garnica, Roman Olalde, Juan Mendoza-Flores, Ruben Duran-Romero

Publication Date: 2010

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The purpose of this work was to study the effect that turbulent flow has on the electrochemical behaviour of a 3-amino-1,2,4-triazole (aminotriazole or 3-AT) based corrosion inhibitor. The experiments were carried out in a rotating cylinder electrode (RCE) and a 4 l laboratory flow-loop. The test environment used in all experiments was a 3% NaCl solution saturated with CO₂ at 20C. Potentiodynamic polarization curves, polarization resistance and electrochemical impedance spectroscopy (EIS) measurements were used to determine the electrochemical behaviour of the steel in the environment at different flow rates and inhibitor concentrations. The inhibiting effect of the tested substance is strongly dependent on the hydrodynamic conditions of the environment. As the turbulence of the environment increases, the efficiency of the inhibitor also increases. This increment could be associated to an increased migration of the inhibitor, from the bulk of the solution towards the surface of the corroding electrode. This increased migration can generate a better coverage of the surface of the corroding electrode and therefore a decrement of i_{corr_{.

When the efficiency of this inhibitor is estimated, controlled hydrodynamic conditions must be taken
into account. Otherwise the value of efficiency that is calculated can be underestimated.

Keywords: aminotriazole, corrosion, CO₂, inhibitor, flow}}