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99010 EVALUATING THE EFFECTS OF TEST METHODS AND FLUIDS COMPOSITIONS ON THE PERFORMANCE OF CORROSION INHIBITORS ELECTROCHEMICALLY

Can carbon steel be adequately protected from corrosion by use of corrosion inhibitors due to the high CO2 concentration?  A project to identify the best commercial corrosion inhibitor by conducting a series of performance evaluation tests.

Product Number: 51300-99010-SG
ISBN: 99010 1999 CP
Author: Huey J. Chen
Publication Date: 1999
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An attempt to answer the question “Can carbon steel be adequately protected from corrosion by use of corrosion inhibitors due to the high CO2 concentration”, we initiated a project to identify the best commercial corrosion inhibitor by conducting a series of performance evaluation tests. We solicited the inhibitors from various chemical suppliers and evaluated their performance using various test methods in test fluid compositions simulating field conditions. Inhibitor performance was evaluated using electrochemical techniques including EIS and DC in the Rotating Cylinder Electrode (RCE) system and the conventional weight loss methods. Various tests were conducted for the purpose of determining the effect of velocity, chemical partition, and dispersibility on inhibitor performance in various test fluids. Physical characteristics testing including emulsion tendency and brine dispersibility were also conducted. Results show that some commercial corrosion inhibitors can be used to protect carbon steel in high CO2 concentration. There are significant performance differences among commercial products in various test methods and fluid compositions. Results show the importance of multiple performance evaluations when selecting corrosion inhibitors for particular field applications. An inhibitor that out performs others under various testing conditions would have a much greater chance to protect against corrosion in the field.

Keywords: Corrosion Inhibitor, Inhibition, Test Methods, Electrochemical Impedance Spectroscopy (EIS), Rotating Cylinder Electrode (RCE), Emulsion Tendency, Brine Dispersibility

An attempt to answer the question “Can carbon steel be adequately protected from corrosion by use of corrosion inhibitors due to the high CO2 concentration”, we initiated a project to identify the best commercial corrosion inhibitor by conducting a series of performance evaluation tests. We solicited the inhibitors from various chemical suppliers and evaluated their performance using various test methods in test fluid compositions simulating field conditions. Inhibitor performance was evaluated using electrochemical techniques including EIS and DC in the Rotating Cylinder Electrode (RCE) system and the conventional weight loss methods. Various tests were conducted for the purpose of determining the effect of velocity, chemical partition, and dispersibility on inhibitor performance in various test fluids. Physical characteristics testing including emulsion tendency and brine dispersibility were also conducted. Results show that some commercial corrosion inhibitors can be used to protect carbon steel in high CO2 concentration. There are significant performance differences among commercial products in various test methods and fluid compositions. Results show the importance of multiple performance evaluations when selecting corrosion inhibitors for particular field applications. An inhibitor that out performs others under various testing conditions would have a much greater chance to protect against corrosion in the field.

Keywords: Corrosion Inhibitor, Inhibition, Test Methods, Electrochemical Impedance Spectroscopy (EIS), Rotating Cylinder Electrode (RCE), Emulsion Tendency, Brine Dispersibility

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