Deakin University
Browse

File(s) under embargo

Lignin-Derivative Ionic Liquids as Corrosion Inhibitors

Version 2 2024-05-31, 06:40
Version 1 2023-08-09, 23:34
journal contribution
posted on 2024-05-31, 06:40 authored by Sharon Monaci, Daniela Minudri, Lorenzo Guazzelli, Andrea Mezzetta, David Mecerreyes, Maria ForsythMaria Forsyth, Anthony SomersAnthony Somers
Corrosion is a significant problem that negatively affects a wide range of structures and buildings, resulting in their premature failure, which causes safety hazards and significant economic loss. For this reason, various approaches have been developed to prevent or minimize the effects of corrosion, including corrosion inhibitors. Recently, biobased inhibitors have gained a certain interest thanks to their unique properties, eco-friendliness, and availability. Among all the green precursors, lignin is of particular interest, being a natural polymer that can be obtained from different sources including agricultural residues. Corrosion inhibitors based on ionic liquids (ILs) also present interesting advantages, such as low volatility and high tunability. If combined, it may be possible to obtain new lignin-based ILs that present interesting corrosion inhibitor properties. In this work, the inhibition properties of new biobased lignin ILs and the influence of anions and cations on the corrosion of mild steel in an aqueous solution of 0.01 M NaCl were investigated by Potentiostatic Electrochemical Impedance Spectroscopy (PEIS) and Cyclic Potentiodynamic Polarization (CPP). Moreover, the surface was characterized using SEM, EDS, and optical profilometry. The IL choline syringate showed promising performance, reducing the corrosion current after 24 h immersion in 0.01 M sodium chloride, from 1.66 µA/cm2 for the control to 0.066 µA/cm2 with 10 mM of the IL present. In addition to its performance as a corrosion inhibitor, both components of this IL also meet or exceed the current additional desired properties of such compounds, being readily available, and well tolerated in organisms and the environment.

History

Journal

Molecules

Volume

28

Article number

5568

Pagination

1-15

Location

Basel, Switzerland

ISSN

1420-3049

eISSN

1420-3049

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Issue

14

Publisher

MDPI