Anticorrosion activity of two new pyridine derivatives in protecting X70 pipeline steel in oil well acidizing fluid: experimental and quantum chemical studies

Abstract

The effectiveness of two new pyridine derivatives, namely N-(2-hydroxybenzylidene) pyridine-4-amine (HBPA) and N-(5-bromo-2-hydroxybenzylidene) pyridine-4-amine (B-HBPA) as corrosion inhibitors for X70 steel in 2 M HCl solution was examined using weight loss, electrochemical and quantum chemical calculations. The results from the experimental studies indicate that the two pyridine derivatives inhibited X70 steel corrosion in the acid environment with HBPA displaying superiority in the inhibition performance. The inhibition efficiency from the polarization studies gave 96 and 92% for HBPA and B-HBPA, respectively; it also indicated that HBPA and B-HBPA behaved as a mixed-type inhibitor with predominant cathodic effect with HBPA inhibitor. Data from electrochemical impedance gave efficiency of 95 and 94% for HBPA and B-HBPA, respectively, at maximum inhibitor concentrations. The inhibitors adsorption on X70 steel surface obeyed Langmuir adsorption isotherm. The inhibitive effect of the studied inhibitors was confirmed by scanning electron microscopy (SEM) analysis. Quantum chemical calculations studied via density functional theory (DFT) provided additional support for better understanding of the mechanism of corrosion inhibition displayed by the studied pyridine derivatives.

Inhibitive Effect of New Azole‐Azomethine Derivatives on Mild Steel Corrosion in HCl Solution: Electrochemical, Scanning Electron Microscopy and Atomic Force Microscopy Studies

“…They reported that the variation in inhibition efficiency of 4 H-triazole derivatives mainly depends on the type and nature of the substituent present in the inhibitor molecule. Recently, Iroha et al [27,28] reported some pyridine-based azomethine inhibitors for the protection of MS in hydrochloric acid solution. They showed that the presence of azomethine bong and pyridine in molecular structure influenced the inhibition efficiency of inhibitors which is in agreement with other reported studies.…”

Investigation of the corrosion inhibition potentials of some 2-(4-(substituted)arylidene)-1H-indene-1,3-dione derivatives: density functional theory and molecular dynamics simulation

“…Metal surface protection from corrosion is a major concern in metallurgical industries, oil factories, environment and chemical plants. Corrosion of metals is a chemical and electrochemical reaction that occurs when metal surfaces are exposed to acidic environment such as in acidic pickling, oil well acidizing and industrial cleaning [1]. Destruction of metals and materials leads to degradation of mechanical properties which, consequently, leads to direct loss of materials strength, reduction in thickness and failure of the material [2,3].…”