Corrosion inhibition of mild steel with schiff base compounds in 1.0 M sulphuric acid solution / Umi Nazira Mohd Shari

Two Schiff base compounds have been synthesized by condensation reaction between 2hydroxybenzaldehyde or 2-hydroxy-3-methoxybenzaldehyde and 1,3-propanediamine in ratio of 2:1. Both Schiff base compounds have been characterized by using basis elemental analysis, FTIR spectroscopy and 1H NMR spectroscopy. Results from elemental analysis and 1H NMR spectroscopy showed that the theoretical and experimental values are closely matched. These indicate that the resulted compounds have been successfully synthesized. The inhibition effect of resulted Schiff base compounds toward the corrosion of mild steel in 1.0 M H2SO4 solution has been measured using weight loss method at different concentrations of 1 x 10-2 M, 5 x 10-3 M and 1 x 10-3 M exposed for 4 days. It is found that the inhibition efficiency increases with increasing concentration for SB 2 with the highest inhibition of 46.41% at 1 x 10-2 M. It also found that for SB1, the inhibition efficiency increases with decreasing concentration with the highest inhibition of 72.81% at 1х 10-3 M.