In this research some metal surfaces, includes; Stainless steel 316,carbon steel, Copper, Aluminum ,and Zinc, were coated with thin and homogeneous polyaniline (PANI) via electro-polymerization of aniline monomer in sulfuric acid, then the corrosion protectiveness of these coatings in artificial seawater solution (3.5% NaCl) at 293, 303, 313, and 323 K were evaluated by potentiodynamic polarization procedures. The structure and surface morphology was examined by SEM , AFM, , and XRD techniques; the resulted AFM and SEM images of PANI films reflects a nanofibers like structure with a diameter of 50 to 70 nm, and a thicknesses of 700 to 2100 nm. All coated metals with PANI exhibited good degree of corrosion protectiveness and the best results was achieved for Zn metal ,the cyclic potentiodynamic tests indicated that only SS316 and aluminum specimens suffer from pitting corrosion and PANI coating reduces the pitting area of the hysterias loop with pushing the pitting potentials for more positive values. The effect of temperature on the inhibition efficiency in the absence and presence of PANI coating of all samples were obtained and expressed as; Ea ΔHa, ΔSa, and ΔGa.
