Synthesis and evaluation of hexamethylenetetramine quaternary ammonium salt as corrosion inhibitor

Abstract

A novel corrosion inhibitor, hexamethylenetetramine quaternary ammonium salt, is synthesized using hexamethylenetetramine (HMTA) and bromohexane as main reactants. The inhibitive action of HQAS on QT800-2 steel in hydrochloric acid medium is evaluated by weight-loss method, electrochemical method, and quantum chemical calculation. The obtained results show that the efficiency of 0.5 wt% HQAS inhibitor in 30 wt.% HCl solution at 363 K is 92.95% and HQAS can form an excellent synergistic effect with some additives. Polarization curves reveal that HQAS behaves as a mixed-type inhibitor with dominant anodic inhibition. Furthermore, the theoretical calculation verifies the relationship between the HQAS molecular structure and corrosion inhibition properties. K E Y W O R D Sacid inhibition, acid solutions, polarization, QT800-2 steel, quantum chemical calculation

An amino‐based protic ionic liquid as a corrosion inhibitor of mild steel in aqueous chloride solutions

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Use of an Ammonium Quaternary Salt Obtained from Avocado as Corrosion Inhibitor of a Duplex Stainless Steel in CO 2 –Saturated NaCl Solution

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Construction of eco‐friendly corrosion inhibitor lignin derivative with excellent corrosion‐resistant behavior in hydrochloric acid solution

“…Therefore, finding new green corrosion inhibitors has become necessary and is being paid more and more attention. [19][20][21][22][23][24] In recent years, the natural compounds, which were extracted from biomass and used as organic inhibitor, have received extensive attention from researchers in the world. [25][26][27][28][29] Lignin owns a three-dimensional aromatic structure and is the most abundant natural biopolymer next to cellulose on earth.…”

“…Therefore, finding new green corrosion inhibitors has become necessary and is being paid more and more attention. [ 19‐24 ] In recent years, the natural compounds, which were extracted from biomass and used as organic inhibitor, have received extensive attention from researchers in the world. [ 25‐29 ]…”