Polarization Curve and its Analysis of Aluminum in Aluminum Chloride Solution

Abstract

Corrosion mass loss and polarization curve of aluminum in 1 mol dm^－3 aluminum chloride solution were measured. The polarization resistance-current density plotting, which is differentiated from the experimented polarization curve, was simulated and considered as a parallel electric circuit of both anodic and cathodic polarization resistances. Current density（0.013～0.017 mA･cm^－2）obtained by differential polarization method has roughly agreed with value of 0.012 mA･cm^－2 of corrosion current density calculated from corrosion mass loss of the aluminum specimen in the aluminum chloride solution.