The inhibition efficiency afforded by Quercetin may be
attributed to the presence of electron rich phenol groups
and aromatic rings, while Ginkgolide A may be attributed
to the presence of electron rich O. The possible
reaction centers are unshared electron pair of heteroatoms
and/or p-electrons of aromatic ring. Generally,
Quercetin can absorb on the mild steel surface on the
basis of donor–acceptor interactions between p-electrons
of the O and aromatic ring and vacant d orbitals
of surface iron. The schematic illustration of different
modes of adsorption on metal is shown in Figure 7.
Besides, the flavonoids are high reductive and can be
oxidized to benzoquinone by the O2 resolved in the
solution, which can inhibit the oxygen-adsorption corrosion