Corrosion inhibition behavior of collidine on aluminium in hydrochloric acid solution

Corrosion is the destructive attack of a metal or alloy chemically or electrochemically by its environment which leads to loss of useful properties of materials [1,2]. Inhibitors are compounds that reduce the rate of corrosion by adsorption on the metal surfaces [3].In this research the inhibitory effect of 2,4,6-collidine on aluminum corrosion in 1M hydrochloric acid solution was studied using polarization curves. The values of potentiodynamic polarization parameters such as corrosion potential (Ecorr), corrosion current density (icorr), anodic and cathodic Tafel slopes (βa, βc) were obtained from the polarization curves through extrapolation method. As the results shown, the addition of collidine decrease the corrosion current density. The results show that, Ecorr shifts to positive direction which is an indication that inhibitor molecule is more adsorbed on the anodic sites, resulting in an inhibition of the anodic reaction