Inhibition and acceleration of Aluminium and Aluminium-Magnesium corrosion in Hydrochloric acid

ABSTRACT

The inhibition of the corrosion of aluminium and A1-Mg alloys in 0.1 M HCI was investigated with regard to the chemical species [complexes, compounds] possibly formed with aluminium ions. As a basis for comparison, some inhibitors such as sodium chromate, citrate and acetate were used. Inhibition efficiencies were measured for 14 days immersion with linear polorization measurements. Only chromate gave nearly complete protection for A1 and A1-Mg alloys. Citrate gave accelerated corrosion at certain concentration. These results are interprated in the term of the species that are formed with the aluminium ions