Maja et al. w5x, who studied the effect of some organic
inhibitors on zinc corrosion in NH Cl solutions report that 4
the corrosion process in these solutions is strongly affected
by the oxiderhydroxide layers forming on the metal surface
in the presence of oxygen. The corrosion is even more
affected if oxygen is present in electrolyte of lower pH.
Boto and Williams w6,7x have shown, that in electrolytes of
pH lower than 5.6, or in the presence of complexing agents
no oxides are formed and the reduction of oxygen is
controlled by diffusion.