Marine Corrosion Mitigation of Mild Steel in Simulated Sea Water by Leaf Extract of Barteria Fistulosa
DOI:
https://doi.org/10.63746/njtd.v22i5.3429Keywords:
isotherm, Bertria fistulosa, efficiency, low carbon steel, corrosionAbstract
Carbon steel is one of the major materials used in the construction of sea piers as well as oil and gas transit pipes. The corrosion of undersea oil and gas pipelines often lead to leakages which result in financial losses and irreparable damage to marine lives. This study investigated the use of Barteria fistulosa (BF) leaves extract as a non-toxic corrosion inhibitor of low carbon steel in 3.5% NaCl employing weight loss method, potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). The weight loss result indicated a significant drop in metal corrosion upon the introduction of the leaves extract to the salt solution. The correlation coefficient (R2) values obtained from isotherm study showed that Langmuir model best fitted the inhibitor extract adsorption on the metal surface. The values of the Gibb’s free energy of adsorption (?Gads) were negative and ranges between -17 to -9 kJ/mol. This indicates that the adsorption process of the leaves extract is both spontaneous and physical. The weight-loss, PDP and EIS results all showed incremental change in efficiency of the inhibitor as its concentration is raised. This reveals that BF leaves extracts offered a shield to low carbon steel in the simulated sea water environment.
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