The corrosion inhibition of thermally pre-aged
Aluminium-Silicon-Magnesium (Al-Si-Mg) alloy in 3.5 %
NaCl solution with natural Avogadro oil of varying concentrations
has been studied using linear polarization
techniques. From the results obtained, the corrosion rate
decreased with an increase in Avogadro oil concentration.
An inhibitor efficiency of 46.7, 58 and 71 % were
obtained at 1.5, 3.0, 4.5 g/v Avogadro oil addition in a
3.5 % NaCl solution respectively for the conventional alloy.
Results from the linear polarization technique indicate a
higher potential value with an increase in the polarization
resistance (Rp) and lower current density in the inhibited
samples than the uninhibited Al-Si-Mg alloy as obtained
from the Tafel plot extrapolation. There exist some levels of
correlation in the inhibitor efficiency between the conventional
and the thermally pre-aged Al-Si-Mg alloy/Avogadro
oil in 3.5 % NaCl solution