Surface Analysis of Inhibitor Film Formed by Poly(Vinyl Alcohol) on Stainless Steel in Sodium Chloride Solution

Abstract

The corrosion inhibition of stainless steel in 0.9% NaCl solution in presence of poly(vinyl alcohol) (PVA) is discussed according to electrochemical measurements, such as potentiodynamic polarization and electrochemical impedance spectroscopy (EIS).The morphology of the surface was analyzed using Scanning Electron Microscopy (SEM). The composition of the layer formed on stainless steel surface was estimated using X-ray Photoelectron Spectroscopy (XPS) technique. Electrochemical measurements indicated that the presence of PVA in NaCl solution decreases the corrosion current and increases the polarization resistance. The values of inhibition efficiency obtained from polarization curves and EIS measurements are in good agreement. In absence and in presence of PVA, SEM images showed that the stainless steel surface was covered with a non-uniform layer and a uniform adsorbed film, respectively. XPS analysis indicated that the surface layer consists of PVA containing a small amount of other elements, such as Na and Cl.

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“…Potentiodynamic polarization tests were carried out by suspending the samples in SBF solution (pH ≈ 7) at room temperature (298K) at a scan rate of 2 mV.s -1 from −300 to 300 mV using a Zahner Zennium electrochemical workstation. The corrosion potential (Ecorr), corrosion current density (icorr), and polarization resistance (Rcorr) were determined using the Tafel extrapolation method [9,10]:…”

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“…Under the applied plasma conditions, an increase in O/C ratio was observed, being most prominent when using the combination of Ar/ H 2 O plasma. Based on the shift in both carbon and oxygen binding energy to slightly higher values, the effect of Ar plasma was attributed to an increased carbonyl (C=O) functionalization (Inagaki et al 2002), while the effect of Ar/H 2 O plasma was attributed to the combination of C=O and hydroxyl (OH) (Samide et al 2010) functionalization. No significant shift was observed in the carbon peak corresponding to CF 2 .…”

“…The averaged oxygen/carbon (O/C) ratio, binding energies (BE) together with the assigned chemical components (based on XPS characterization), and CA values are summarized in Table 2. Untreated samples of ETFE showed the presence of oxygen, which is assigned to adsorbed oxygen (Samide et al 2010) during storage of ETFE sheets. The two observed carbon peaks at 290.9 eV and 286.0 eV represent CF 2 and CH 2 components, respectively (Inagaki et al 2002).…”

Influence of Polyvinyl Alcohol on Corrosion Resistance of Mild Steel Simulated Concrete Pore Solution Prepared in Well Water

“…The Figure3(c) indicates that in the presence of 50 ppm PVA and 50 ppm Zn 2+ mixture in SCPS, the surface coverage increases which in turn results in the formation of insoluble complex on the metal surface. In the presence of PVA and Zn 2+ , the surface is covered by a thin layer of inhibitors which effectively control the dissolution of mild steel27 . SEM analysis of a) Polished mild steel (control); b) mild steel immersed in SCPS(Blank); c) mild steel immersed in SCPS + + PVA 50 ppm + Zn 2+ 50 ppm…”