Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2014 Vol: 6 Issue: 7

Salvia officinalis essential oil and the extract as green corrosion inhibitor of mild steel in hydrochloric acid.

Abstract

Accurate identification of the Essential oil of aer ial parts of Salvia Officinalis was obtained by hyd rodistillation, was undertaken using GC and GC/MS (gas chromatograp hy- mass spectrometry), followed by principal compo nent analysis (PCA). The oil was predominated by α -Thujone (22.2%). The extract and Essential oil of S. officinalis leaves has been evaluated as a corrosion inhibitor for steel in 1 M HCl solution by means of weight lo ss measurements, potentiodynamic polarization, electro chemical impedance spectroscopy (EIS). Tafel polari zation study revealed that extract of S. officinalis acts as a mixed type inhibitor. Inhibition was found to increase with increasing concentration of the essential oil and e xtract of S. Officinalis. Values of inhibition effi ciency calculated from weight loss, Tafel polarization curves, and EI S are in good agreement. The effect of temperature on the corrosion behaviour of mild steel in 1M HCl with ad dition of essential oil and extract was also studie d and thermodynamic parameters were determined and discus sed