Macromolecules for Inhibition of Corrosion and Wear

The phthalocyanines and Schiff base compounds are uniquely qualified inhibitors for corrosion. They are high electron density molecules for interaction with the metal surface, and possess large spatially arranged structures to serve as environmental barriers. Additionally, these compounds do stack-up as layered structures which provides shear planes, thus serving as lubricants. A number of these compounds have been synthesized and studied. Both electrochemical impedance spectroscopic and potentiostatic polarization techniques were used to determine their corrosion inhibition efficiencies. Wear studies were made using grease lubricated stainless steel miniature bearings. The results have shown that Schiff base compounds can be good additives for greases as they enhance wear life of bearings and inhibit corrosion by at least and order of magnitude. Although phthalocyanines, both monomers and polymers, provided a significant corrosion inhibition efficiencies 90, they were not effective lubricants compared to the Schiff bases.... Schiff Base, Phthalocyanine, Additives, Fluorinated grease.