Producción Científica Profesorado

The influence of iodide in corrosion inhibition by organic compounds on carbon steel: Theoretical and experimental studies



Camacho Mendoza, Rosa Luz

2020

Aquino-Torres, E., Camacho-Mendoza, R.L., Gutierrez, E.c, Rodriguez, J.A., Feria, L., Thangarasu, P., Cruz-Borbolla, J*. Theinfluence of iodide in corrosion inhibition by organic compounds on carbon steel: Theoretical and experimental studies. Applied Surface Science. 514, (2020) 145928DOI: 10.1016/j.apsusc.2020.145928


Abstract


The corrosion inhibition by cinnamic, p-coumaric and caffeic acid of carbon steel in 1.0?M HCl and its synergistic combination with KI was investigated using electrochemical and quantum chemical methods. A synergistic effect was observed when 2 mM potassium iodide was added to 0.1 mM inhibitor, where the corrosion inhibition efficiency (IE%) increased from 70% to 80%. In addition, the participation of iodide in the Fe surface was investigated during the adsorption of corrosion inhibitors such as cinnamic, p-coumaric and caffeic acids on Fe(110). The formation of an iodide monolayer on the Fe(110) surface was studied by density functional theory (DFT) periodic slab calculations. The DFT results revealed that cinnamic, p-coumaric and caffeic acids were adsorbed effectively on the metal surface through aromatic rings and carboxylic acid groups, as the bond distances with the Fe surface were 2.09 Å for Fe?C and 1.97 Å for Fe?O. Low adsorption energies were obtained; ?52.90, ?44.29 and ?33.39 kcal/mol for cinnamic, p-coumaric and caffeic acids, respectively. Additionally, the magnetic moment of the Fe plane was changed significantly if the aromatic carboxylic acid adsorbed onto the metal surface had coating strengths as follows: cinnamic > p-coumaric > caffeic. The present study therefore provides a mechanistic understanding of the role of iodide in the corrosion inhibition process.



Producto de Investigación




Artículos relacionados

Synthesis and Relative Stability of a Series of Compounds of Type [Fe(II)(bztpen)X]+, Where bztpen =...

Pyrite?Arsenopyrite Galvanic Interaction and Electrochemical Reactivity

Pentacoordination at antimony in dibenzostibocines via DSb transannular interactions (D = O, S): A s...

Five-membered ring chelate complexes of Ni(II), Pd(II) and Pt(II) derived of di-(2-pyridyl)-N-ethyli...

Synthesis, characterization, and crystal structures of n-alkyldiorganodithiophosphates RS2P(OC6H4)2

Six-membered ring chelate complexes of Pd(II) and Pt(II) derived from di-(2-pyridyl)pyrimidin-2-ylsu...

Synthesis and Spectroelectrochemical Studies of Mixed Heteroleptic Chelate Complexes of Ruthenium(II...

Synthesis and Crystal Structure of [Te{S(C6H3S)2O}]: A Tetracyclic Tellurium(II) Compound Displaying...

Synthesis and crystal structure of the N-8-(diphenyl-hydroxy-2-aminomethylpyridine)borane

Ni(II) and Pd(II) organometallic and coordination complexes with a new tridentate N,N,O-donor ligand...