Green corrosion inhibitors of carbon steel in acid medium: Plant extracts

The use of inhibitors is one of the most practical methods to save metals against corrosion from aggressive media. Corrosion is encountered in numerous sectors, and the studies summarized corrosion costs equivalent to 3% of each nation's gross domestic product (GDP) and can be estimated to be US$2.5 trillion. This review presents a prospection using plant extracts as green corrosion inhibitors considered as the friendship of the environment. The scientific articles on Scopus until the year 2022 were 2460 documents. For example, prof Ramezanzadeh Bahram from the Info Institute for Color Science and Technology, Tehran, Iran published more than 400 global papers followed by prof Hammouti, known at the University of Mohammed First in Oujda, Morocco

The effect of temperature and concentration on the corrosion inhibition of recycled aluminum alloy of 3-aminopropyltrimethoxysilane (APTMS)

This work investigated the adsorption properties of 3-aminopropyltrimethoxysilane on recycled aluminum alloy. The influence of deposition conditions, such as pH and temperature of the sol-gel solution and the deposit's crosslinking temperature, on the coating's protective properties was studied by potentiodynamic polarization and electrochemical impedance spectroscopy. With Fourier Fourier-transformed infra-red spectroscopy and scanning electron microscopy, the quality of the coating was analyzed. The polarization curves performed on the coating deposited at different pH and temperature values showed that a more compact coating was obtained at pH 4 – 6  with a depositing temperature of ~ 25 °C. The best crosslinking temperatures are between 100 and 140°C. The analysis of the evolution of the protective barrier properties under long-time immersion conditions by electrochemical impedance spectroscopy showed that the coating exhibits good corrosion performance, compared to the bare alloy,  at less than one week

QUINOXALINE DERIVATIVES AS EFFICIENT CORROSION INHIBITORS FOR STEEL IN ACIDIC MEDIA: BIBLIOMETRIC STUDY

This review summarizes the most works undertaken on corrosion protection using quinoxaline compounds. also known as benzopyrazines. Their inhibitive performance towards the corrosion of mild steel in acid solutions was widely studied using different techniques as weight loss measurements, Electrochemical Impedance Spectroscopy (EIS) and supported by surface analysis and theoretical approaches (DFT, Dynamic simulation …). Scopus database gives more than 70 papers leading to select the five most cited and also the most published authors. In this way, VOSviewer used to conduct a bibliometric study to draw quantitative analysis, and statistical results of the screened academic documents were obtained.  The presence of heteroatoms (N, O, S, P …), aromatic rings and double/triple bonds facilitates the understanding of the adsorption phenomena on the metal surface to create a barrier (physical and/or chemical) to retard the ingress of aggressive ions (H+) and dissolved oxygen, thus inhibiting the corrosion process

2,5-Bis(4-pyridyl)-1,3,4-oxadiazole as Efficient Organic Corrosion Inhibitor for Carbon Steel in Normal Hydrochloric Acid Medium: Influence of the Temperature on the Inhibition Process

2,5-Bis(4-pyridyl)-1,3,4-oxadiazole (4-POX) has been synthesized and studied as organic corrosion inhibitor for carbon steel (CS) in 1M HCl solution using the weight loss technique in the temperature range from 303 to 333 K. The obtained results confirmed the excellent anticorrosion properties of 4-POX and the inhibition efficiency increased with increasing inhibitor concentration and decreased with increasing temperature medium. A mixture of physisorption and chemisorption is proposed for the corrosion inhibition mechanism and the process followed the kinetic/thermodynamic model of Langmuir in the temperature range from 303 to 343 K. The adsorption and kinetic parameters for CS/4-POX/1 M HCl system were calculated from experimental gravimetric data and the interpretation of the results are given

Introduction to Essential Oils as New Agents for Corrosion Inhibition

Corrosion is a widespread problem that affects a variety of sectors, causing considerable economic losses and safety risks. Traditional corrosion inhibitors frequently use synthetic compounds, which can be poisonous and environmentally hazardous. Essential oils have recently emerged as interesting alternatives due to their natural origin, biodegradability, and potential anti-corrosion properties. This review introduces the use of essential oils as novel corrosion inhibitors. It addresses the chemical composition of essential oils, their corrosion-prevention processes, and the benefits they provide over traditional inhibitors. The review also includes contemporary research findings and case studies that demonstrate the effectiveness of essential oils in a variety of acidic situations. By investigating the potential of essential oils for corrosion inhibition, this research hopes to contribute to the development of safer and more sustainable corrosion control systems

Kinetics and Equilibrium Study for the Adsorption of Maxilon Blue Dye on Prosopis juliflora Fruit Seeds as a Low-Cost Adsorbent

The aim of this work was to investigate the adsorption capacity of Maxilon Blue dye using Prosopis juliflora fruit seeds as an adsorbent. The seeds of P. Juliflora were utilized as a low-cost adsorbent to remove the cationic dye, Maxilon Blue, from an aqueous solution in batch experiments, examining the effects of mass, pH, and contact time. Three error functions —coefficient of determination, Chi-square, and the sum of error squares — were employed to assess the adsorption data. The adsorption equilibrium was characterized using Langmuir, Freundlich, and Temkin isotherm models. The equilibrium data closely followed the Langmuir model, indicating a maximum adsorption capacity of 85.54 mg/g on a monolayer. To elucidate the adsorption mechanisms, pseudo-first-order and pseudo-second-order kinetic models were applied. The kinetic analysis revealed that the adsorption process conformed best to the pseudo-second-order model. Consequently, this study demonstrates that P. juliflora fruit seeds are an effective, economical, and eco-friendly adsorbent for the removal of Maxilon Blue dye from aqueous solutions

Coronavirus and Nutrition: Approach for Boosting Immune System in Morocco

The Covid-19 pandemic is a pandemic of an emerging infectious disease, the 2019 coronavirus disease Covid-19, caused by the SARS-CoV-2 coronavirus. The essential protective measures recommended by WHO (2020) to limit the spread of the Coronavirus (Covid-19) limited in the suppression of travel, quarantine and containment. In the first part of this review, we will examine the origin of the coronavirus, the modes of spread and their adverse effects on human health. We will include in our analysis the nutritional importance of the different approaches based on mechanisms to boost the immune system and therefore good viral defense. The immune system helps protect the host against environmental agents such as pathogenic microorganisms (bacteria, fungi and viruses), thus preserving the integrity of the organism. To preserve the defense mechanisms of the organisms, an adequate nutritional state must be maintained with adequate intakes of calories, vitamins, minerals and water which must be continuously provided by a healthy diet. In addition, it is necessary to have nutritional information that will help boost the immune system of people in the fight against Covid-19, nutritional diagnosis and early nutritional management of affected patients must be integrated into the overall therapeutic strategy. Several clinical data have shown that micronutrients like vitamins, including vitamins A, C, D, E, B12, B6 and folic acid; trace elements like iron, zinc, copper, magnesium, selenium, and omega-3 fatty acids like docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) play a major role in supporting the immune system