N. Heterocyclic compounds as corrosion inhibitors for zinc in HCl acid solutions Substituents effect and reduction mechanism of some arylidinehydrazide derivatives at mercury electrode. Polarographic behavior of hexavalent uranium in amino acids solutions. Spectrophotometric micro-determination of copper (II), silver (I) and gold (III) using azastyrene Schiff bases Differential pulse polarographic studies on simple and mixed ligand complexes of Cd (II) with diaminopropane and adipate ligands. Nickel Corrosion Inhibition in Sulfuric Acid-Electrochemical Studies, Morphologies, and Theoretical Approach