Rachid Salghi
Laboratoire d'Analyses Agro-alimentaires, Ecole Supérieure de Technologie d'Agadir, B.P: 33/S Agadir MAROC, E-mail: salghi@esta.ac.ma
Lahcen Bazzi, Mina Zaafrani
Laboratoire de Chimie - Physique, Equipe de Chimie Moléculaire et Corrosion, Faculté des Sciences d'Agadir, B.P: 28/S –Agadir - Maroc.
Abstract
The comparative study of the corrosion inhibition of two aluminium 3003 and 6063 alloys by metal cations such as magnesium and lithium is carried out in a sodium chloride solution 3%. The result obtained in the use of the electrochemical technique shows that for 3003 alloy, the Mg2+ ions reduced the pitting corrosion. This increases the difference between the potential of pitting and the potential of corrosion. These ions presented the best inhibition action in the temperature range of 25 to 55 °C. The inhibition efficiency increases with the concentration of these ions and reaches the value of 80% at 5.10-2 M. In the case of the aluminium 6063 alloy, the best inhibition is obtained in the presence of the Li+ ions. The increase of the concentration of these ions increases the difference between the potential of pitting and the potential of corrosion. The rise of the temperature of 25 in 55 °C improves the resistance to corrosion of this alloy in blank medium. However, in the presence of the Li+ ions, the inhibitive efficiency decreases when the temperature increases