Investigation on the Adsorption and Corrosion Inhibition Behavior of Gum Acacia and Synergistic Surfactants Additives on Mild Steel in 0.1 M H₂SO₄

Abstract

Adsorption and corrosion inhibition effect of gum acacia alone and in presence of surfactants sodium dodecyl benzene sulphonate and cetyltrimethyl ammonium bromide on mild steel in 0.1 M H₂SO₄ in temperature range of 30 to 60°C was investigated using weight loss method, chemical analysis of solution, scanning electron microscopy, atomic force microscopy and determination of thermodynamic parameters. Inhibiting action of gum acacia is synergistically enhanced on addition of small amount of surfactants. SEM and AFM results confirmed the existence of an adsorbed protective film on the mild steel surface. Thermodynamic parameters reveal that adsorption process is spontaneous and obey Freundlich adsorption isotherm.

Keywords:

• Adsorption isotherm
• corrosion inhibition
• gum acacia
• mild steel
• surfactant
• synergistic effect