Abstract
The pitting corrosion behavior of lead in 0.10 M Na2HPO4 solutions containing various concentrations from NaNO3 has been studied using potentiodynamic anodic polarization and SEM techniques and complemented by both X-ray and FT-IR surface analysis. Above certain critical NaNO3 concentration, the aggressive anions prevented the oxygen evolution and induce pitting on the Pb electrode surface. Pitting-initiation and pitting-growth were found to depend on the concentration of the aggressive NO−3 anions. Also, some changes in the (I–E) curves within the active, pre-passive and passive regions were recorded. These changes imply mainly the appearance of new stages and peaks. This behavior gives an indication for definite changes in the pit-characteristics, which interpreted in terms of solution composition and kinetics of its associated processes within pits.
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