Theoretical and experimental insights into the C-steel aqueous corrosion inhibition at elevated temperatures in 1.0M HCl via multi-carbonyl Gemini cationic surfactants

Despite corrosion being an inevitable process, researchers strive to control corrosion. In this study, our goal was to prepare two amido Gemini cationic surfactants, LAPG and MAPG, each with different alkyl chains and multiple carbonyl groups as rich electronic rich centers. We aimed to evaluate these surfactants as potential corrosion inhibitors for carbon steel (CS) in 1M HCl at temperatures of 25-55 ± 0.1°C. In theoretical investigations, DFT parameters and Mont Carlo simulation were run to predict the adsorption affinity and reactive sites of the LAPG and MAPG molecules. Their efficacy was investigated experimentally considering weight loss and electrochemical techniques. The Tafel polarization revealed that at 0.1mM of LAPG and MAPG, the corrosion current density (i corr) of CS was reduced to the lowest extent (75.56 and 53.82μAcm-2) compared to 529.3μAcm-2 in the absence of the inhibitors. EIS data suggests the enhancement of the thickness of the adsorbed layers of the studied compounds from the decrease of the double-layer capacitance C dl values. The Langmuir isotherm explained the adoption phenomena of these compounds at 25-55 ± 0.1°C. Activation and adsorption thermodynamic parameters predicted the chemisorption behavior of these molecules onto the steel surface. AFM and XPS tools confirm the CS surface protection due to these inhibitors' adsorbed layer. A parallel study showed the superiority of these corrosion inhibitors in HCl compared with those reported earlier, making these compounds highly promising corrosion inhibitors, especially in high-temperature acidic environments

Unlocking the Potential of NiSO4·6H2O/NaOCl/NaOH Catalytic System: Insights into Nickel Peroxide as an Intermediate for Benzonitrile Synthesis in Water

Nickel peroxide nanoparticles (NPNPs) were prepared and characterized using various techniques including transmission electron microscope (TEM), scan electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), and FTIR spectra. The aqueous basic catalytic system NiSO4·6H2O/NaOCl/NaOH (pH = 14) was investigated for the catalytic dehydrogenation of benzylamine and parasubstituents to their corresponding nitriles at room temperature. The obtained results confirmed the formation of NiO2 nanocrystalline particles with a size of 20 nm. Benzylamine with electron-donating groups showed higher yields of nitriles compared to electron-withdrawing groups. The mechanism involved in the in situ generated NiO2 nanoparticles dehydrogenating benzylamine to benzonitrile, with the produced NiO converting back to NiO2 nanoparticles through the excess of NaOCl

Anticorrosion Properties of Robust and UV-Durable Poly(vinylidene fluoride-co-hexafluoropropylene)/Carbon Nanotubes Superhydrophobic Coating

Aluminum is vulnerable to corrosion, biofouling, and durability reduction as a result of forming unwanted deposits during their interactions with liquids. In this work, a high-corrosion-resistance superhydrophobic coating (SHC) of poly(vinylidene fluoride-co-hexafluoropropylene)/carbon nanotubes was fabricated employing an electrospinning technique and spray coating. The dispersed carbon nanotubes were sprayed into the electrospun poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) to avoid galvanic corrosion. The as-prepared SHC exhibited a water contact angle (WCA) of 156 ± 2° and a tilting angle of 3 ± 2°. The wettability and the corrosion resistance of the PVDF-HFP/CNTS SHC were evaluated before and after exposure to UV in 3.5 wt % NaCl. The surface morphology and topography were explored before and after exposure to UV using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Employing the electrochemical impedance spectroscopy (EIS) revealed that the as-prepared PVDF-HFP/CNTsSHC has a high corrosion resistance over the immersion in 3.5 wt % NaCl for 1 month.This publication was supported by the Undergraduate Research Experience (UREP) award [UREP29-159-2-043] from the Qatar National Research Fund (a member of The Qatar Foundation)