The Inhibitive Effect of Extract of Flowers of Cassia Auriculata in 2 M HCl on the Corrosion of Aluminium and Mild Steel

Polyphenolics of air dried flowers of Cassia auriculata was tried as a corrosion inhibitor on Aluminum and Mild steel in 2M HCl at 30 ± 1℃ by weight loss, polarization study and impedance methods. It was ascertained that the percentage of inhibition increases with the increase in concentration of the extracts but decreases with an increase in temperature. The inhibitive effect of the extract of flowers of Cassia auriculata could be attributed to the presence of some phytochemical constituents in the extract which is adsorbed on the surface of the Aluminum metal and Mild steel.