Role of Transition Metal Sulphates in the Corrosion of 1100 Aluminium in Hydrochloric Acid

Abstract

The corrosion behaviour of 1100 aluminum in 10% hydrochloric acid

has been studied in the presence of transition metal sulphates such as iron.

cobalt, nickel, copper and zinc sulphate using galvanostatic and weight

loss methods. The concentrations of added metal sulphates were 50, 100

and 500 ppm. It has been observed that iron and zinc sulphates retard the

corrosion at all concentrations whereas nickel and copper inhibit the reaction

of aluminium in hydrochloric acid up to 100 ppm concentration. Cobalt

sulphate accelerates corrosion at all studied concentrations. Polarisation

studies reveal the fact that iron and zinc are effective on cathodic sites.