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Corrosion inhibition of carbon steel in artificial seawater by caprylate |
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| Authors: | Emmanuel Onyekachi Nwanebu Sasha Omanovic |
| Affiliation: | 1. Department of Chemical Engineering, McGill University, Montreal, Quebec, Canada;2. Department of Chemical Engineering, McGill University, Montreal, Quebec, Canada
Contribution: Conceptualization, Resources, Supervision, Visualization, Writing - review & editing |
| Abstract: | The corrosion inhibition efficiency of sodium caprylate (SC) in protecting carbon steel (CS) in aqueous 3.5 wt.% NaCl was studied. SC was found to enable good corrosion protection of CS, yielding a maximum corrosion inhibition efficiency of 80 ± 2%. The inhibition efficiency was shown to be directly proportional to the SC surface coverage, characterized by a two-step adsorption isotherm. The adsorption of SC on CS in the lower SC concentration region was found to follow the Langmuir adsorption isotherm and the first-order reversible adsorption kinetics. The corresponding Gibbs free energy of SC adsorption was determined to be −23.8 kJ · mol−1, indicating a highly spontaneous adsorption process. The scanning electron microscopy imaging of the SC-inhibited CS showed that the surface exhibited good corrosion stability during a 72 h exposure to the test medium. |
| Keywords: | carbon steel corrosion inhibition NaCl solution sodium caprylate |
