The Mechanism of Corrosion Inhibition of Iron in Acid Solution by Acetylenic Alcohols

Abstract

The mechanism of corrosion inhibition of iron by acetylenic alcohols in acid solutions was established by relating the interfacial structure obtained from spectroscopic measurements with the corrosion reaction kinetics obtained from electrochemical measurements. A modified adsorption interaction model was found to be applicable for describing the hydrogen evolution reaction on an inhibitor‐covered iron electrode. For the iron dissolution reaction, a parallel dissolution model was found to be applicable. The parallel dissolution model was further justified by constructing the two‐dimensional potential energy diagrams for iron dissolution on a free Fe surface and an inhibitor‐covered surface with the use of Morse functions. A comprehensive analysis of the mechanism of corrosion inhibition in general is given. It is suggested that formation of a compact three‐dimensional protective layer on the electrode surface is key for effective inhibition of corrosion.

Theoretical and experimental studies of the corrosion behavior of some thiazole derivatives toward mild steel in sulfuric acid media

“…This protection is attributed to the adsorption of the inhibitor over the corroded metal surface [24,25]. Since both anodic dissolution of iron and hydrogen evolution were suppressed, the studied molecules behave like a mixed inhibitor [26].…”

Electrochemical and Theoretical Study of Pyrazole 4-(4,5-dihydro-1H-pyrazol-5-yl)-N,N-dimethylaniline (D) as a Corrosion Inhibitor for Mild Steel in 1 M HCl

“…In this work we were mainly interested in the N-heterocyclic inhibitors of iron corrosion in an acidic medium; these N-heterocycles of interest are pyrazoles. Pyrazoles derivatives are a very important class of iron corrosion inhibitors [18][19][20][21][22][23][24][25][26][27][28]. As a matter of fact, nitrogen containing heterocycles can be easily protonated in acidic medium, thus exhibiting good inhibitory action on the corrosion of metals in acid solutions.…”

Effect of Organo-Nitrogen Compounds on Inhibition Efficiency of Mild Steel Corrosion in Acidic Media

“…The chloride ions are adsorbed more strongly on the metal surface than the sulfate ions [19]. This will lead to easier and favoured formation of (FeCl -···Inh + ) ad .…”