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Corrosion inhibition efficiency study in a microalloyed steel for sour service at 50 °C

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Abstract

A H2S corrosion inhibition efficiency study by a carboxyamidoimidazoline compound was carried out using electrochemical impedance spectroscopy (EIS) and electrochemical noise (EN) techniques. The microalloyed steel assessed was specially designed for sour gas transport and is intended to be applied as line pipe steel in Mexico. The corrosive media was a deaerated 3% NaCl solution, H2S saturated after heated to 50 °C, with several inhibitor concentrations, ranging from 0 to 100 ppm, per test. The EIS and ENA data were analyzed and use as monitoring indicators for the development of a protective film by the inhibitor within 24 h testing. The results indicate that maximum inhibitor efficiency was achieved with only 5 ppm inhibitor concentration, but this efficiency value decreases with increasing of the inhibitor concentration. In addition the results also shows that the maximum efficiency was obtained at an elapsed time of 8 h, and beyond this time the efficiency again decrease. The EN transients prove that regardless the inhibitor concentration, the steel was highly susceptible to localized corrosion.

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Acknowledgements

The authors acknowledge the financial support of Consejo Nacional de Ciencia y Tecnologia through “Programa de apoyo complementario para la consolidación institucional de grupos de investigacion” (Convocatoria 2006).

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Authors and Affiliations

  1. UAEM, Centro de Investigacion en Ingeniería y Ciencias Aplicadas, Av. Universidad 1001, Col. Chamilpa, 62210, Cuernavaca, Morelos, Mexico

    A. Torres-Islas, S. Serna, J. Uruchurtu & J. G. González-Rodríguez

  2. UNAM, Facultad de Química/Instituto de Ciencias Físicas, Coyoacan, 04510, Mexico, DF, Mexico

    B. Campillo

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  1. A. Torres-Islas
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  2. S. Serna
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  3. J. Uruchurtu
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  4. B. Campillo
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  5. J. G. González-Rodríguez
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Correspondence to A. Torres-Islas.

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Torres-Islas, A., Serna, S., Uruchurtu, J. et al. Corrosion inhibition efficiency study in a microalloyed steel for sour service at 50 °C. J Appl Electrochem 40, 1483–1491 (2010). https://doi.org/10.1007/s10800-010-0127-5

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  • DOI: https://doi.org/10.1007/s10800-010-0127-5

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