The present work concerns the valorization of ethanolic extract of the aerial part of Ammi visnaga, as an antioxidant as well as a corrosion inhibitor for mild steel in 1 M HCl medium. The antioxidant activity was evaluated by two techniques; total antioxidant capacity and free radical scavenging 2, 2-diphenyl-1-picrylhydrazyl (DPPH). The phytochemical tests were carried out by colorimetric reactions and precipitation which revealed an intense presence of tannins and Flavonoids. The total phenol, flavonoid and condensed tannin content were conducted according to the Folin Ciacalteu, Quettier-Deleu and Broadhurst methods, respectively. The results showed that the ethanolic extract of Ammi visnaga was rich of polyphenols. Ethanolic extract had a great radical scavenging activity (IC50=2. 82 mg/mL) when compared to the standard BHT (IC50=0. 27 mg/mL) along with a high total antioxidant capacity (82. 46 mg BHT/g extract). On the other hand, the ANTICORROSION behavior of ethanolic extract of Ammi visnaga was conducted by electrochemical impedance spectroscopy, potentiodynamic polarization and mass-loss measurements. Polarization curves indicated that ethanolic extract of Ammi visnaga acts as mixed-type inhibitor. Impedance measurements showed that the double-layer capacitance decreased and charge-transfer resistance increased with rise of ethanolic extract of Ammi visnaga concentration and thereby increased the inhibition efficiency. The adsorption of the extracted molecules followed the Langmuir adsorption isotherm model. It was registered that ethanolic extract of Ammi visnaga exhibited both an important antioxidant and anticorrosive properties.

Air pollution is an increasing prevalence of environmental diseases. Previously, hazardous air pollutants (HAPs) on the ozone layer, which primarily constitute volatile organic compounds (VOCs), have become a major public concern. As a result, the Environmental Protection Agency (EPA) has introduced a strict regulation on the limit of VOCs content for various daily products such as paints and solvents to reduce the risk. Hence, the study aims to develop an eco-friendly coating with low VOCs content per the imposed regulation by deploying the leaves extract of Moringa Oleifera (MOE) for marine vessel protection. The formulated coating was characterized by using optical, electrochemical, and morphological analysis to study the effectiveness of its barrier property against the aggressive solution of seawater. Additionally, measurement of its VOCs content was conducted following the ASTM D2369-03. The results obtained suggested that the incorporation of 1 wt. % of MOE of C2 increased the resistivity of coating in reducing the penetration of ionic electrolytes up to 91. 2% while exhibiting the traits of low VOCs content category at a value of 198 g/L.

A new series of imidazoles [2,1-b]benzthiazole linked with other heterocyclic scaffolds were synthesized, and a new Mannich base link with a drug (Cefixime) was also synthesized. Oxopyrimidine ring was prepared from reacting Mannich base containing terminal Methyl group condensed with different substituted aromatic aldehydes, producing new chalcones, which undergo ring closer with urea gave new Oxopyrimidine derivatives. All compounds were recognized by Fourier Transform Infrared Spectroscopy, Proton nuclear magnetic resonance and Carbon-13 (C13) nuclear magnetic resonance spectra. Some new compounds were evaluated as ANTICORROSION agents, and some showed potent inhibition against corrosion.

In this research the effect of silicon carbide nanoparticles and surface pretreatment on the mechanical properties and corrosion protection properties of the polyurethane coatings (40 μm in thickness) were studied on a low carbon steel substrate. The substrates were prepared by polishing and sand blasting methods. Dispersion of the nanoparticles in the polyurethane coating was studied by field emission scanning electron microscope (FE-SEM) image and X-ray diffraction (XRD) analysis. The physical and mechanical properties of the coatings were evaluated by pull-off adhesion, Tubular impact and pencil hardness tester. The Electrochemical Impedance Spectroscopy (EIS) and polarization tests were employed in order to investigate the corrosion resistance behavior of the coatings. The effect of nanoparticles on the chemical bonding of polyurethane were investigated using Fourier Transform Infrared Spectrometry (FT-IR) Analysis. The results of the physical and mechanical study showed that the existence of 2 wt% of nanoparticles, leads to the increase of the adhesion strength up to 50%, hardness of coating increased from 3H to 5H and impact resistance were increased about 34 %. In addition, the results of electrochemical test showed that the existence of 2 wt% of nanoparticles in polyurethane did not significantly change the corrosion resistance behavior of the polyurethane. The results of field emission scanning electron microscope (FE-SEM) image and X-ray diffraction (XRD) analysis showed that nanoparticles up to 2 wt% were well dispersed in polyurethane. Sand blasting of the specimens prior to coating increased adhesion strength up to 35%, but decreased the impact resistance in compare with polishing.

Background: Corrosion is a pervasive issue affecting various industries, resulting in significant economic losses. Traditional corrosion protection methods often involve toxic chemicals, prompting the need for eco-friendly alternatives. This study demonstrates the green synthesis of zinc oxide (ZnO) nanoparticles via a sol-gel approach and their integration into epoxy resin coating to enhance ANTICORROSION efficacy. Objectives: This study aims to synthesize ZnO nanoparticles using a green synthesis method, characterize their properties, and evaluate their potential applications in corrosion protection and biomedical fields. Methods: The synthesized nanoparticles were characterized using x-ray diffraction (XRD), energy dispersive spectroscopy (EDS), and high-resolution transmission electron microscopy (HRTEM). The ZnO nanoparticles were then integrated into epoxy resin to develop a nano-coating optimized for enhanced performance. Results: The XRD analysis revealed the formation of a spherical zincite ZnO phase with an average crystallite size of 16.7 nm. HRTEM confirmed the average particle size of 16.3 nm, with uniform morphology. Electrochemical impedance spectroscopy (EIS) analysis demonstrated the exceptional corrosion resistance of the ZnO/epoxy resin coating. The green synthesis method produced uniform ZnO nanoparticles successfully integrated into the epoxy resin coating. The resulting nano-coating exhibited enhanced corrosion resistance, making it a promising solution for protecting metal surfaces.  Conclusion: This study demonstrates the green synthesis of ZnO nanoparticles using a sol-gel approach. The synthesized nanoparticles were characterized using XRD, EDS, and HRTEM. The ZnO nanoparticles were then integrated into epoxy resin to develop a nano-coating optimized for enhanced corrosion resistance. The results show that the ZnO/epoxy resin coating exhibits exceptional corrosion resistance, making it a promising solution for protecting metal surfaces.

The present work involved preparation of new polyimides drived from chalcone derivative, chalcone compound prepared from reaction of 4-amino acetophenone with vanillin, and then the chalcone which have amine group reacted with maleic anhydride to produce the corresponding amic acid. The synthesized amic acid compound was introduced in ring closure reaction by acetic anhydride and sodium acetate to produce maleimide. The new maleimdie was polymerized by free radical polymerization to yield homo and copolyimide with two vinylic monomers (acrylonitrile and methyl acrylate). The structures of synthesized compounds and polymers have been confirmed by physical properties and spectroscopy measurements (FT-IR) Fourier Transform Infrared Spectroscopy, (1H-NMR) nuclear magnetic resonance. In addition, antibacterial activity of polymers was examined against two types of bacteria, namely Gram-negative and Gram-positive and gives good results in bacterial inhibition. Likewise, the ANTICORROSION activity of polymers was studied by using potensiostat measurements in acidic medium and the polymers give inhibition efficiency (94%).