CeCl3 and LaCl3 binary solutions as environment-friendly corrosion inhibitors of AA5083 Al-Mg alloy in NaCl solutions

Lanthanum and cerium chloride and their binary mixtures have been investiga ted as corrosion inhibitors of AA5083 Al-Mg alloy in aerated 3.5% NaCl aque ous solution. Their inhibitor power was evaluated by using electrochemical techniques together with full immersion tests. The highest protection degre e was found for the binary solution doped with 250 ppm CeCl3 and 250 ppm La Cl3. Scanning electron microscopy and energy dispersive spectroscopy enable d us to confirm the cathodic nature of the inhibition process and to establ ish some features of the inhibition process. (C) 2001 Published by Elsevier Science B.V.