ANISALIDINE DERIVATIVES AS CORROSION INHIBITORS OF MILD STEEL IN ACIDIC MEDIA. 1

Abstract

The corrosion inhibitory properties on mild steel in acidic media by nitrogen-containing ligands N-(4-nitro phenyl) p-anisalidine (SB1), N-(4-chloro phenyl) p-anisalidine (SB2), N-(4-phenyl) p-anisalidine (SB3), N-(4-methoxy phenyl) p-anisalidine (SB4), and N-(4-hydroxy phenyl) p-anisalidine (SB5) have been studied using mass loss, thermometric, and potentiostatic polarization techniques. Due to adsorption of the additive molecules on the metal surface the inhibition efficiency increases up to 98.85% with increasing additive concentration. A synergistic effect exists between the Schiff base additives and mild steel. The mechanistic effect of corrosion inhibition has been investigated by the potentiostatic polarization technique. The impact of temperature on the performance of these compounds clearly shows the effect of the decomposition and desorption of these compounds at higher temperatures.

Keywords:

• Corrosion
• Inhibition
• Mild steel
• Schiff base

Acknowledgments

This work was supported by Material Laboratory, Maharshi Dayanand Saraswati University, Ajmer (Rajasthan) India. We express our sincere gratitude to the referee for valuable suggestion.

Notes

vs = very strong, s = strong, m = medium, w = weak.

Effective area of specimen: 3.875 cm², temperature: 30° ± 0.5°C, immersion time: 72 h.

Effective area of specimen: 3.875 cm², temperature: 30° ± 0.5°C, immersion time: 72 h.

Effective area of specimen: 1.0 cm², temperature: 30° ± 0.5°C.

Effective area of specimen: 1.0 cm², temperature: 30° ± 0.5°C.

Initial temperature: 30° ± 0.5°C; area of specimen: 3.875 cm².