Lavender oil is extracted from lavender herb, collected in the east region of Morocco (Tafoughalt) and tested as corrosion inhibitor for mild steel in 1 M HCl. The inhibiting effect was studied by weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. Polarisation measurements show that lavender oil essentially acts as a cathodic inhibitor. The natural oil reduced the overall corrosion current density. The protection efficiency was found to increase with oil content to obtain ca. 90% at only 2 g L-1 and kept its inhibiting efficiency the same even at higher temperatures. The adsorption of lavender oil on mild steel followed the Langmuir's isotherm model. The thermodynamic parameters for inhibiting process were calculated and interpretation of the results was given.
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Zerga et al. (2009) studied this question.
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