Pulsed Laser Deposition Deposited Layers of Pseudo-Binary Zinc Oxides and Zinc-Porphyrin for Steel Corrosion Inhibition

Abstract

Obtaining of ZnTa2O6 and ZnV2O6 pseudo-binary oxide materials by hydrothermal and coprecipitation methods and of Zn(II) 5-pyridyl-10,15,20-tris-(3,4-di-methoxy-phenyl) porphyrin (ZnPydiMeOPP) are presented. Mixed thin films of pseudo-binary oxide materials and Zn-porphyrin were realized by pulsed laser deposition (PLD) technique on steel disks and corrosion tests in 0.1 M HCl solution were performed. The inhibition efficiency (IE) in all cases containing porphyrin was always higher than 80%. The best IE (84.50%) was obtained for the sandwich structure using the hydrothermally obtained ZnV2O6 oxide as the first layer and the ZnPydiMeOPP porphyrin as the second layer. The mechanism of corrosion protection can be explained by the physical/mechanical barrier effect.