Characterization Of Steel Surfaces Research Articles

Green synthesis of novel carbohydrate polymer chitosan oligosaccharide grafted on d-glucose derivative as bio-based corrosion inhibitor

A novel chitosan oligosaccharide macromolecule carrying a glucose moiety (COS-g-Glu) has been synthesized and used as a non-toxic, durable, and biodegradable inhibitor of mild steel corrosion in acidic medium (1.0 M HCl). This macromolecule was synthesized by grafting a glucose moiety on Chitosan, and characterized by FT-IR, 1H and 13C NMR. The acid corrosion inhibiting effect of this biodegradable macromolecule is obtained by experimental electrochemical characterization (EIS and PDP), surface [Scanning Electron Spectroscopy (SEM), Energy Dispersive Spectroscopy (EDS), infrared (FT-IR), and Atomic Force Microscopy (AFM)]. Corrosive acidic solutions were identified by UV–visible spectroscopy (UV–vis) and by ICP-OES spectrometry. Electrochemical tests show that the inhibition efficiency increases with increasing concentration of the inhibitor and reaches an optimum value of 97% at 10−3 M. The thermodynamic parameters, and steel surface characterization methods confirmed the adsorption of COS-g-Glu. The results obtained from the DFT, and MD calculations correlate with the results obtained experimentally.

Epoxy coating anti-corrosion properties enhancement via the steel surface treatment by nanostructured samarium oxide-poly-dopamine film

Nowadays, the rare earth element-based conversion coatings (REE-based CCs) are a potential eco-friendly alternative for hazardous and carcinogenic Cr-based CCs. These coatings have morphological defects that impair their performance; therefore, they need to be surface modified.In this study, for the first time, the steel surface was coated with an eco-friendly Sm-based CC and then post-modified by poly-dopamine based biopolymer. The air-exposed based self-polymerization and oxidant-induced polymerization are two protocols which have been utilized for poly-dopamine synthesis. The SEM/EDS analysis and Raman spectroscopy have been employed for the treated steel surface characterization. In addition, the electrochemical impedance spectroscopy (EIS) analysis and salt-spray test (SST) were carried out to investigate the epoxy (EP) coating corrosion protection performance.The Rt values of the EP applied on the Sm-PDA modified steel, subjected to a 3.5 wt. % NaCl solution, are respectively 2550 GΩ.cm2 and 100 kΩ. cm2 before and after the creation of scratch. These values are about 94000-fold and 21-fold more than the Rt of the defected/un-defected EP coatings applied on the unmodified steel. In addition, the EP applied on the Sm-PDA modified steel showed lower corrosion and less disbonding in SST and higher resistance against CD than the EP applied on the unmodified steel.

Effect of Electron Donating Functional Groups on Corrosion Inhibition of J55 Steel in a Sweet Corrosive Environment: Experimental, Density Functional Theory, and Molecular Dynamic Simulation.

Benzimidazole derivatives were synthesized, characterized, and tested as a corrosion inhibitor for J55 steel in a 3.5 wt % NaCl solution saturated with carbon dioxide. The experimental results revealed that inhibitors are effective for steel protection, with an inhibition efficiency of 94% in the presence of 400 mg/L of inhibitor. The adsorption of the benzimidazole derivatives on J55 steel was found to obey Langmuir’s adsorption isotherm. The addition of inhibitors decreases the cathodic as well anodic current densities and significantly strengthens impedance parameters. X-ray photoelectron spectroscopy (XPS) was used for steel surface characterization. Density functional theory (DFT) and molecular dynamic simulation (MD) were applied for theoretical studies.

The role of drug as corrosion inhibitor for mild steel surface characterization by SEM, AFM, and FTIR

Purpose The purpose of this study is to understand the inhibitor behavior of specific drug against mild steel corrosion and their adsorption mechanism on the surface. Design/methodology/approach Corrosion rates are influenced by the formation of inhibitor aggregates at the mild steel surface. Detail surface characterizations of mild steel have been studied before and after adsorption of drugs in 1N HCl solution. Scanning electron microscopy, atomic force microscopy and Fourier transform infrared spectroscopy were used to examine the effect of drug adsorption on steel surface. Findings Scanning electron microscopy analysis suggested that the metal had been protected from aggressive corrosion because of the addition of the inhibitors. Atomic force microscopy visualization confirmed the formation of protective layer on steel surface, resulting in the decrease in surface roughness with corrosion rates. The nature of metal surface has been analyzed by Fourier transform infrared spectroscopy. Originality/value The findings of this study will help us to understand the interaction of specific drugs with mild steel surface and their potential inhibition mechanism.

Characterization of steel surface under cathodic protection in seawater

Purpose – The purpose of this paper is to characterize the surface of steel under cathodic protection while submerged in seawater, to understand the mechanism that controls the operation of the protection system.

Preparation and Characterization of Steel Surfaces for Adhesive Bonding

AbstractIn fiber-reinforced polymer (FRP) strengthened steel structures, debonding of the bonded FRP reinforcement from the steel substrate may result from adhesion failure at the steel/adhesive interface or the FRP/adhesive interface, cohesion failure in the adhesive, or a combination of these two modes. Of these failure modes, cohesion failure in the adhesive is the preferred mode of failure as it facilitates the development of a design theory based on the adhesive properties; the other two failure modes should be avoided if at all possible. This paper presents a systematic experimental study to identify a surface-adhesive combination that will avoid adhesion failure at the steel/adhesive interface. Different steel surface preparation methods, including solvent cleaning, hand grinding, and grit blasting, and different commonly used adhesives were examined in the study. Surface characterization using three key parameters (namely surface energy, surface chemical composition, and surface roughness and topo...

Fe10Cr and Fe15Cr as Standards for Stainless Steel Surface Characterization, by XPS

X-ray photoelectron spectroscopy is used to characterize thin oxide/hydroxide films present on the surface of stainless steels after mechanical polishing and electrochemical polarization. In this work the XPS spectra of Fe10Cr and Fe15Cr were collected after mechanical polishing and sputtering in order to determine the fitting parameters of the two major alloy elements, i.e., iron and chromium.

Combined use of epma, xps, gdos for the characterization of steel surfaces

Combined use of epma, xps, gdos for the characterization of steel surfaces