Improvement of the Corrosion Resistance for the Galvanic Coupling of Steel with Polypyrrole Coated Galvanized Steel

摘要

The aim of the present work is to use intrinsically conducting polymers (ICPs) to improve the corrosion resistance ability of the galvanic coupling of galvanized steel coupled with steel by coating it with polypyrrole (PPy). The potentiostatic technique was used for forming the PPy 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 potential, electrolyte concentration (sodium tartrate concentration), solution pH, and type of electrode. The formed coat layer was investigated using X-Ray Photoelectron Spectroscopy (XPS) technique. Finally, the corrosion resistance ability of the galvanic coupling of PPy coated galvanized steel coupled with bare steel was investigated using electrochemical methods such as Tafel method. The results show that the galvanic coupling of PPy coated galvanized steel and bare steel has a corrosion current which is 31.8% less than the galvanic coupling of bare galvanized when coupled with steel.