Abstract
The aim of the present work is to investigate the possibility of improving corrosion resistance of the galvanic coupling of steel and zinc by coating steel with a layer of polyaniline (PANi) conducting polymer. The galvanostatic technique was used for forming the PANi layer using a potentiostat (EG&G A-273 Potentiostat/Galvanostat). Many variables were investigated for their effect on the characteristics of the formed coat layer such as: applied current density, aniline monomer concentration, and solution pH. The formed coat layer was investigated using X-Ray Photoelectron Spectroscopy (XPS). Finally the corrosion resistance ability of the galvanic coupling of PANi coated steel coupled with zinc was investigated using the electrochemical methods such as Tafel method. The results show that the corrosion rate of the galvanic coupling of PANi coated steel and zinc has been decreased by a factor ranging from 1.4 up to 1.51 than the coupling without coat, depending on the operating conditions.