Electrochemical and XPS study of polyethyleneimines of different molecular sizes as corrosion inhibitors for AISI 430 stainless steel in near-neutral chloride media

Effect of surface passivation on corrosion resistance and antibacterial properties of Cu-bearing 316L stainless steel

“…Zhang et al have proved that the Cu-bearing stainless steel (SS) showed excellent antibacterial performance against gram-positive Staphylococcus aureus and garm-negative Escherichia coli [22]. However, Cu-bearing stainless steel is more prone to the pitting corrosion which may induce the release of more heavy metal ions including Cr 3+ , Cr 6+ , Ni 2+ and Cu 2+ to the environment, and increases the risk to cause health problem [23]. Oguzie et al [24] also found that Cu in SS had negative effect on the corrosion resistance in the deaerated sulfuric acid solution, and further explained that addition of Cu in SS could destroy the continuity of passivation film, due to the potential difference between Cu and Fe, which is a easy way to galvanic corrosion.…”

Hyaluronan-based pericellular matrix: substrate electrostatic charges and early cell adhesion events

“…Taking into account that the XPS sampling depth is higher than the film thickness for both PEI/PSS and PEI/ PSS/PEI films, the XPS peaks recorded are a convolution of the signals originating from the whole film. Thus, the C 1s peaks for both PEI/PSS and PEI/PSS/PEI films resulted from a convolution of the two components due to PSS, i.e., component 1 (~285.0 ±0.2 eV) and 2 (~286.7 ±0.2 eV), assigned to phenyl ring carbons and methylene groups, and to C-SO 3 -groups, respectively (Santos et al, 2001), and the single component 3 (at 285.7 ±0.2 eV) due to PEI, and assigned to the C-NH, C-NH2 C-N groups in the PEI chains (Finšgar et al, 2009). Accordingly, the C 1s peak shape for PEI/PSS films is dominated by components 1 and 2, typical of the outer PSS layer, with a smaller contribution from the underlying PEI layer, while the C 1s peak in PEI/PSS/PEI films is dominated by component 3, characteristic of the outer PEI layers.…”

“…Indeed, for the PEI/PSS films the N 1s peak is formed by two components of similar intensity, respectively due to quaternary nitrogen groups (~402.2 ±0.2 eV binding energy (BE)), and to the backbone amine nitrogen (400.0 ±0.2 eV BE) (Finšgar et al, 2009). On the other hand, for the PEI/ PSS/PEI films the N 1s peak was essentially formed by the component due to the amine groups (assigned to chain inside the PEI layer, not directly interacting with PSS chains), with a small quaternary nitrogen component, due to PEI chains at the interface with the PSS layer, where the positively charged quaternary nitrogen groups act as counter-ions partially neutralising the negatively charged sulphonic groups.…”

Investigation of Corrosion Inhibition Efficiency of Some Synthesized Water Soluble Terpolymers on N-80 Steel in HCl, NaCl and Simulated Oil Well Water

“…Very few reports are available in the literature on water soluble polymers as corrosion inhibitors for oil well tubing and casing material in harsh environments. Finsagar et al studied the effectiveness of polyethyleneimines of different molecular weights as corrosion inhibitors for AISI 430 [12] and ASTM 420 [13] stainless steel in nearneutral chloride media. Gao et al [14] reported that the high inhibition efficiency of some acetylenic alcohols with a-alkenylphenones and α,β-unsaturated aldehydes is due to the surface polymerization during acid environmentally benign, easily degradable and suitable for use in both acidic and neutral media.…”