Falcaria vulgaris leaves extract as an eco-friendly corrosion inhibitor for mild steel in hydrochloric acid media.

Undoubtedly, metal corrosion is one of the most challenging problems faced by industries. Introducing corrosion inhibitors is a reasonable approach to protecting the metal surface. Due to environmental concerns and the toxicity of industrial organic corrosion inhibitors, researchers are continually exploring acceptable replacements. The current study focused on the application of Falcaria Vulgaris (FV) leaves extract to mitigate mild steel (MS) corrosion in a 1 M HCl environment. The polarization findings demonstrated that the corrosion current density decreased from 264.0 µA/cm2 (for the sample submerged in the blank solution) to 20.4 µA/cm2 when the optimal concentration of 800 ppm of FV leaves extract was added to the acid solution. Electrochemical impedance spectroscopy (EIS) analysis revealed an inhibition efficiency of 91.3% at this concentration after 6 h of immersion. It was determined by analyzing several adsorption isotherms that this corrosion inhibitor obeys the Frumkin isotherm. AFM, FE-SEM, and GIXRD surface analyses also supported the findings that adding FV leaves extract can reduce metal damage by adsorption on the metal surface.

Corrosion inhibition of a novel antihistamine-based compound for mild steel in hydrochloric acid solution: experimental and computational studies.

Focused on the assessment of the diphenhydramine hydrochloride (DPH) capabilities as an alternative to conventional and harmful industrial corrosion inhibitors, electrochemical techniques were employed. The optimum concentration of 1000 ppm was determined by molecular simulation and validated through electrochemical experiments. The results acquired from the electrochemical impedance spectroscopy (EIS) study showed that DPH at a concentration of 1000 ppm has a corrosion efficiency of 91.43% after 6 h immersion. The DPH molecules' orientation on the surface was assessed based on EIS predicting horizontal adsorption on the surface. Molecular simulations were done to explore the adsorption mechanism of DPH. The DPH molecules' orientation on the surface was also assessed based on computational studies confirming the horizontal adsorption predicted by EIS.

Corrosion mitigation of mild steel in hydrochloric acid solution using grape seed extract.

Plant extracts have gained a lot of attention due to their ecofriendly nature for corrosion inhibition. In this study, we examined the inhibition performance of grape seed extract as an eco-environmental inhibitor for mild steel in hydrochloric acid medium. Electrochemical impedance spectroscopy, potentiodynamic polarization, and electrochemical noise techniques were employed to study mild steel's electrochemical behavior in the hydrochloric acid solutions containing grape seed extract. Results depicted that grape seed extract could successfully inhibit the corrosion of mild steel. Besides, water droplet contact angle, field-emission scanning electron microscopy coupled with energy dispersive spectroscopy, Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy were utilized to study the surface of mild steel specimens after dipping in acidic solutions. Electrochemical impedance results showed a corrosion efficiency of about 88% in 300 ppm of grape seed extract. Also, results revealed more compact corrosion products with improved integrity in the presence of grape seed, which confirmed electrochemical test results.

Highly potent radical scavenging-anti-oxidant activity of biologically reduced graphene oxide using Nettle extract as a green bio-genic amines-based reductants source instead of hazardous hydrazine hydrate.

Reduced graphene oxide (rGO) is relied upon to be the most promising candidate for high-proficiency. Hydrazine is the most conventional efficient reducing agent that has been frequently used for reduction of graphene oxide, however, it is not environmentally safe due to its toxic nature, causing unsatisfactory defects on the basal plan of GO. Therefore, employing green and efficient reducing agents from natural sources like plant extracts has become the research interest for obtaining high quality reduced graphene oxide sheets in recent years. Here a one-step, easy, cost-effective and green synthesis method based on Nettle leaves' extract has been introduced as an effective reduction method of graphene oxide compared with the toxic and harmful Hydrazine hydrate substance. In this study, GO and rGO were obtained from various methods and characterized by Raman spectroscopy, field emission scanning electron microscope, high-resolution transmission electron microscope (HR-TEM), X-ray diffraction analysis (XRD) and X-ray photon spectroscopy (XPS) analysis. Results of different analytical techniques revealed that the Nettle leaves' extract could successfully reduce GO sheets to high performance reduced graphene oxide with 79% efficiency in comparison with conventional Hydrazine hydrate. On the other side the rGO obtained by Nettle solution could scavenge the free radicals with 70% inhibition capacity at least concentration. Existence of Histamine and Serotonin and many other polyphenols as a part of Nettle leaves composition by following anti-oxidants mechanisms (H donation or electron transfer) promote the anti-oxidant functionality of Nettle leaves. So the highlighted achievement of this paper is to obtain a highly anti-oxidant green reduced graphene oxide with a wide applications i.e medical and polymer composite with UV-shielding activity.