Gravimetric, electrochemical and surface studies on the anticorrosive properties of 1-(2-pyridyl)-2-thiourea and 2-(imidazol-2-yl)-pyridine for mild steel in hydrochloric acid

Abstract

1-(2-Pyridyl)-2-thiourea and 2-(imidazol-2-yl)-pyridine are described here for the first time as inhibitors of mild steel corrosion in acidic medium.

4-(Pyridin-4-yl)thiazol-2-amine as an efficient non-toxic inhibitor for mild steel in hydrochloric acid solutions

“…Further, the wider absorption band around 326 nm was attributable to the n / p* electron transition due to the lone pair electrons of the N and/or S atom. 1 Aer immersion for 24 h in the corrosion inhibitor, Fig. 13 shows that the band at 259 nm completely disappears, and the maximum band of the n / p* transition shows a red-shi, which may be due to the charge transfer from the ligand to the metal.…”

“…In particular, organic heterocyclic compounds containing N, O, S, and unsaturated bonds have excellent adsorption properties to metal surfaces, and they can effectively inhibit the acid corrosion of metals. [1][2][3][4][5][6] Among them, Nheterocyclic organic compounds, particularly azoles and pyridines, have become the focus of research because of their good water solubility, low cost, and excellent corrosion inhibition. For example, Yüce et al 4 studied 2-amino-4-methyl-thiazole (AMT) in a hydrochloric acid (HCl) solution as a corrosion inhibitor for mild steel; the results show that AMT exhibited good inhibition efficiency and can form a dense layer of a protective lm on the surface of mild steel toward corrosion inhibition of the metal.…”

“…Furthermore, 4-pyridinylthiazole-2-amines are non-toxic and environmentally friendly since they are widely used in medicine and have the potential to become green corrosion inhibitors. 10,11 In this article, a novel eco-friendly inhibitor, namely, 4-(pyridin-4-yl)thiazol-2-amine (PTA), was smoothly synthesized by using a modied synthesis procedure, and it was selected as the corrosion inhibitor mainly based on the following factors: (1) could be easily synthesized at lower costs; (2) could contain multiple active centers and aromatic rings; (3) has special affinity toward the inhibition of metal corrosion in acidic solutions; (4) has bulky steric hindrance. The corrosion inhibition properties of the compound in a HCl medium were investigated by weight loss methods, potentiodynamic polarization measurements, and electrochemical impedance spectroscopy (EIS).…”

Pivotal Role of Heteroatoms in Improving the Corrosion Inhibition Ability of Thiourea Derivatives

“…These compounds were determined as mixed-type inhibitors with the maximum inhibition efficiencies at 4.0 × 10 –4 M of 93.6% and 96.7%, respectively. 9 In 2019, we chose 1-phenyl-2-thiourea (PTU) and 1,3-diisopropyl-2-thiourea (ITU) to investigate the effect of temperature and structure on their inhibition ability in 1.0 M HCl solution. 10 It was worth that their corrosion inhibition efficiencies increased as the temperature was up in the range of 30–60 °C.…”

Anti-Corrosive Properties of Alkaloids on Metals

“…Despite significant advances in the field of corrosion science and technology, corrosion is still a major obstacle to industry in all countries of the world. Steel, copper, zinc, aluminum as well as their alloys, has been extensively applied in construction and other industrial fields owing to its low price and good material properties [1][2][3][4]. However, one of the great challenges that metals face in industrial applications is that they are particularly susceptible to corrosion under acidic or alkaline conditions, which could lead to huge economic losses and potential environmental problems.…”