Electrochemical Synthesis of Poly (o-phenetidine) coating on ۳۰۴ Stainless Steel and Investigation of Their Corrosion Inhibition Properties in HCl Medium

چکیده مقاله

Corrosion control of metals is an important issue of technical, economical, environmental and aesthetical importance. A number of methods for the protection of metals against corrosion are known, but looking for new method of corrosion control continues to be subject of intensive research [1]. Among them, using of organic coating is a great way to protect metal from corrosion, especially if the coating also has good mechanical properties. Electrodeposit of conductive polymer on the surface of an electrode is a very wide research in electrochemistry during the last decades [2]. In this research, homogeneous and adherent poly(o-phenetidine) coatings were electrosynthesized on 304 stainless steel by using the chronopotentiometery under galvanostatic conditions method. These coatings in current densities viz. 0.5, 1.5, 2 and 2.5 mA.cm -2 for duration of time of 100 s were tested. The deposition times viz. 50, 70, 100 and 150 s were applied for the current density of 1.5 mA.cm -2 and the corresponding potential transients were recorded. The synthesized coatings were characterized by Fourier transform infrared spectroscopy (FT-IR), UV-Vis spectroscopy and SEM. The corrosion inhibitions of coatings were investigated in 0.1M HCl solution by the polarization technique and electrochemical impedance spectroscopy (EIS). The obtained results show that the corrosion current decreases significantly from 3.7759 µA.cm −2 for blank electrode to 0.4101 µA.cm −2 for poly(o-phenetidine)-coated 304 stainless steel, under optimal conditions.