Analisis Stabilisasi Bioetanol Terhadap Korosi Logam Menggunakan Inhibitor Alami Berbasis Minyak Pala
DOI:
https://doi.org/10.31004/jutin.v9i1.54907Keywords:
Nutmeg Essential Oil, Green Corrosion Inhibitor, Carbon Steel, Bioethanol, Inhibition Efficiency, Langmuir Adsorption, ElectrochemistryAbstract
This research evaluates the potential of nutmeg essential oil as an environmentally friendly corrosion inhibitor for carbon steel in a bioethanol medium. GC-MS analysis identified 23 compounds, with the major components including sabinene (21.3%), α-pinene (18.7%), β-pinene (12.4%), myristicin (8.9%), and limonene (7.2%). Weight loss testing over 90 days showed the control system had a corrosion rate of 2.847 mm/year, which significantly decreased to 0.412 mm/year with the addition of 750 ppm nutmeg oil, resulting in an optimal inhibition efficiency of 85.5%. Increasing the concentration to 1000 ppm did not provide a significant improvement, indicating adsorption saturation on the metal surface. Electrochemical characterization thru potentiodynamic polarization curves showed a shift in corrosion potential from -0.687 V to -0.523 V and a decrease in corrosion current density from 48.3 μA/cm² to 6.8 μA/cm² at the optimal concentration, confirming nutmeg oil as a mixed-type inhibitor. Electrochemical impedance spectroscopy showed an increase in polarization resistance from 245 Ω·cm² to 1,687 Ω·cm², consistent with the weight loss data.References
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