Corrosion inhibition of carbon steels with organic compounds exhibiting effective
corrosion inhibition is an on-going research. The corrosion inhibition of low carbon steel in 1M
HCl solution by the combined admixture of vanillin and benzonitrile (VBN), and salvia
officinalis with lavendulan officinalis (SLV) was studied by weight loss method. Results
obtained show that VBN and SLV performed effectively with maximum inhibition efficiency
91.03% at 1.5% VBN concentration and 97.89% at 5% SLV concentration. The inhibition
efficiency of VBN increased with concentration but decreased with exposure time compared to
the values obtained for SLV which showed non-dependence on concentration and exposure time
after 1% SLV concentration. Correlation plots of inhibition efficiency versus inhibitor
concentration show VBN to be more concentration dependent in performance. Calculated data
for standard deviation shows the degree of variation from mean values for both compounds is
significant at low inhibitor concentration due to time dependence action. Statistical analysis
through ANOVA shows inhibitor concentration overwhelmingly influences the inhibition
performance of the despite even though exposure time is statistically relevant to minimal degree