The effect of aegle marmelos leaves extract on corrosion inhibition of aluminium in alkaline solution

摘要

The effect of aegle marmelos leaves (AML) extract on the corrosion inhibition of aluminium in 1N NaOH solution was studied using chemical and electrochemical techniques. It was found that the inhibition efficiency increased with the increase of AML extract upto 800 ppm. Beyond this concentration, corrosion inhibition efficiency was decreased from 87.6 to 84.7% It indicates that 800ppm is the optimum concentration to get maximum corrosion protection for aluminium 1N NaOH. The results obtained from chemical and electrochemical measurements are in reasonably good agreement. The potentiodynamic polarization studies reveal that the AML extract act as mixed type inhibitor. Adsorption of AML extract on aluminium surface follows Langmuir adsorption isotherm. The surface characteristics of the inhibited and uninhibited aluminium were investigated by scanning electron microscope studies.