We have recently described a new
potential use for Langmuir–Blodgett
films of surfactants containing redox-inert metal ions in the inhibition
of corrosion and have shown good qualitative results for both iron
and aluminum surfaces. In this study we proceed to quantify electrochemically
the viability of gallium(III)- and zinc(II)-containing metallosurfactants
[GaIII(LN2O3)] (1) and [ZnII(LN2O2)H2O] (2) as mitigators
for iron corrosion in saline and acidic media. We evaluate their charge
transfer suppression and then focus on potentiodynamic polarization
and impedance spectroscopy studies, including detailed SEM data to
interrogate their metal dissolution/oxygen reduction rate mitigation
abilities. Both complexes show some degree of mitigation, with a more
pronounced activity in saline than in acidic medium.