Publications Repository - Gdańsk University of Technology

Chemical interactions between aqueous vanadium species and aluminium alloy AA6063-T5 were investigated in vanadate-containing NaCl solutions. Confocal Raman and X-ray photoelectron spectroscopy experiments were utilised to gain insight into the mechanism of corrosion inhibition by vanadates. A greenish-grey coloured surface layer, consisting of V+4 and V+5 polymerized species, was seen to form on the alloy surface, especially on top of cathodic micrometre-sized IMPs, whereby suppressing oxygen reduction kinetics. The results suggest a two-step mechanism of corrosion inhibition in which V+5 species are first reduced to V+4 or V+3 species above cathodic IMPs, and then oxidized to mixed-valence V+5/V+4 polymerized compounds.

Authors

• Dr. Dmitry Kharitonov,
• Jens Sommertune,
• Cem Örnek,
• dr hab. inż. Jacek Ryl link open in new tab ,
• Prof. Irina Kurilo,
• Prof. Per Claesson,
• Jinshan Pan