{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T14:01:58Z","timestamp":1782396118741,"version":"3.54.5"},"reference-count":20,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2023,7,21]],"date-time":"2023-07-21T00:00:00Z","timestamp":1689897600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Molecules"],"abstract":"<jats:p>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 \u00b5A\/cm2 for the control to 0.066 \u00b5A\/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.<\/jats:p>","DOI":"10.3390\/molecules28145568","type":"journal-article","created":{"date-parts":[[2023,7,24]],"date-time":"2023-07-24T01:15:45Z","timestamp":1690161345000},"page":"5568","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Lignin-Derivative Ionic Liquids as Corrosion Inhibitors"],"prefix":"10.3390","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8173-3278","authenticated-orcid":false,"given":"Sharon","family":"Monaci","sequence":"first","affiliation":[{"name":"POLYMAT, University of the Basque Country UPV\/EHU, 20018 Donostia-San Sebastian, Spain"},{"name":"Institute for Frontier Materials, Deakin University, Burwood, VIC 3125, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniela","family":"Minudri","sequence":"additional","affiliation":[{"name":"POLYMAT, University of the Basque Country UPV\/EHU, 20018 Donostia-San Sebastian, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4655-2946","authenticated-orcid":false,"given":"Lorenzo","family":"Guazzelli","sequence":"additional","affiliation":[{"name":"Dipartimento di Farmacia, Universit\u00e0 di Pisa, Via Bonanno Pisano 33, 56126 Pisa, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4540-9948","authenticated-orcid":false,"given":"Andrea","family":"Mezzetta","sequence":"additional","affiliation":[{"name":"Dipartimento di Farmacia, Universit\u00e0 di Pisa, Via Bonanno Pisano 33, 56126 Pisa, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0788-7156","authenticated-orcid":false,"given":"David","family":"Mecerreyes","sequence":"additional","affiliation":[{"name":"POLYMAT, University of the Basque Country UPV\/EHU, 20018 Donostia-San Sebastian, Spain"},{"name":"Ikerbasque, Basque Foundation for Science, 48009 Bilbao, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4273-8105","authenticated-orcid":false,"given":"Maria","family":"Forsyth","sequence":"additional","affiliation":[{"name":"POLYMAT, University of the Basque Country UPV\/EHU, 20018 Donostia-San Sebastian, Spain"},{"name":"Institute for Frontier Materials, Deakin University, Burwood, VIC 3125, Australia"},{"name":"Ikerbasque, Basque Foundation for Science, 48009 Bilbao, Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0220-2904","authenticated-orcid":false,"given":"Anthony","family":"Somers","sequence":"additional","affiliation":[{"name":"Institute for Frontier Materials, Deakin University, Burwood, VIC 3125, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,7,21]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"3806","DOI":"10.1039\/D0MA00681E","article-title":"Recent developments in sustainable corrosion inhibitors: Design, performance and industrial scale applications","volume":"2","author":"Verma","year":"2021","journal-title":"Mater. Adv."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"241","DOI":"10.1007\/s11998-021-00547-0","article-title":"A concise review on corrosion inhibitors: Types, mechanisms and electrochemical evaluation studies","volume":"19","author":"Ma","year":"2022","journal-title":"J. Coat. Technol. Res."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Marzorati, S., Verotta, L., and Trasatti, S.P. (2019). Green corrosion inhibitors from natural sources and biomass wastes. Molecules, 24.","DOI":"10.3390\/molecules24010048"},{"key":"ref_4","unstructured":"Wei, H., Heidarshenas, B., Zhou, L., Hussain, G., Li, Q., and Ostrikov, K. (2020). Materials Today Sustainability, Elsevier Ltd."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Thomas, P.A., and Marvey, B.B. (2016). Room temperature ionic liquids as green solvent alternatives in the metathesis of oleochemical feedstocks. Molecules, 21.","DOI":"10.3390\/molecules21020184"},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Zullo, V., Iuliano, A., and Guazzelli, L. (2021). Sugar-based ionic liquids: Multifaceted challenges and intriguing potential. Molecules, 26.","DOI":"10.3390\/molecules26072052"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"8135","DOI":"10.1021\/acssuschemeng.2c01976","article-title":"Natural Deep Eutectic Solvents Based on Choline Chloride and Phenolic Compounds as Efficient Bioadhesives and Corrosion Protectors","volume":"10","author":"Picchio","year":"2022","journal-title":"ACS Sustain. Chem. Eng."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"565","DOI":"10.1016\/j.molliq.2018.02.045","article-title":"Organic corrosion inhibitors for industrial cleaning of ferrous and non-ferrous metals in acidic solutions: A review","volume":"256","author":"Goyal","year":"2018","journal-title":"J. Mol. Liq."},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Brycki, B.E., Kowalczyk, I.H., Szulc, A., Kaczerewska, O., and Pakiet, M. (2018). Corrosion Inhibitors, Principles and Recent Applications, InTech.","DOI":"10.5772\/intechopen.72943"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Malinowski, S., Wr\u00f3bel, M., and Woszuk, A. (2021). Quantum chemical analysis of the corrosion inhibition potential by aliphatic amines. Materials, 14.","DOI":"10.3390\/ma14206197"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"86","DOI":"10.1016\/j.ejpb.2021.04.013","article-title":"Cholinium-based ionic liquids as bioinspired hydrotropes to tackle solubility challenges in drug formulation","volume":"164","author":"TSintra","year":"2021","journal-title":"Eur. J. Pharm. Biopharm."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"113556","DOI":"10.1016\/j.fluid.2022.113556","article-title":"Selection of hydrotropes for enhancing the solubility of artemisinin in aqueous solutions","volume":"562","author":"Sales","year":"2022","journal-title":"Fluid Phase Equilibria"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Kwolek, P., Dychto\u0144, K., Ko\u015bcielniak, B., Ob\u0142\u00f3j, A., Podborska, A., and Wojnicki, M. (2022). Gallic Acid as a Potential Green Corrosion Inhibitor for Aluminum in Acidic Solution. Metals, 12.","DOI":"10.3390\/met12020250"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"105","DOI":"10.1016\/j.jiec.2014.10.019","article-title":"Enhanced corrosion inhibition effect of tannic acid in the presence of gallic acid at mild steel\/HCl acid solution interface","volume":"25","author":"Obot","year":"2015","journal-title":"J. Ind. Eng. Chem."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"8651","DOI":"10.1021\/ie5009597","article-title":"Comprehensive Investigation on the Thermal Stability of 66 Ionic Liquids by Thermogravimetric Analysis","volume":"53","author":"Cao","year":"2014","journal-title":"Ind. Eng. Chem. Res."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"1545","DOI":"10.1016\/0010-938X(96)00047-9","article-title":"An investigation of the formation and destruction of corrosion inhibitor films using electrochemical impedance spectroscopy (EIS)","volume":"38","author":"Tan","year":"1996","journal-title":"Corros. Sci."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"35","DOI":"10.1021\/je800441u","article-title":"Iron complexation studies of gallic acid","volume":"54","author":"Fazary","year":"2009","journal-title":"J. Chem. Eng. Data"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"118850","DOI":"10.1016\/j.molliq.2022.118850","article-title":"Influence of the cation partner on levulinate ionic liquids properties","volume":"354","author":"Mero","year":"2022","journal-title":"J. Mol. Liq."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2558","DOI":"10.1021\/acssuschemeng.5b00751","article-title":"Enhancing the Antioxidant Characteristics of Phenolic Acids by Their Conversion into Cholinium Salts","volume":"3","author":"Sintra","year":"2015","journal-title":"ACS Sustain. Chem. Eng."},{"key":"ref_20","unstructured":"(2011). Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens (Standard No. ASTM G1-03)."}],"container-title":["Molecules"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1420-3049\/28\/14\/5568\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T20:16:35Z","timestamp":1760127395000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1420-3049\/28\/14\/5568"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,7,21]]},"references-count":20,"journal-issue":{"issue":"14","published-online":{"date-parts":[[2023,7]]}},"alternative-id":["molecules28145568"],"URL":"https:\/\/doi.org\/10.3390\/molecules28145568","relation":{},"ISSN":["1420-3049"],"issn-type":[{"value":"1420-3049","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,7,21]]}}}