A confirmatory study on the use of N-methyl-2-pyrrolidone (NMP) in the industrial field for cleaning metal molds and other objects, Corrosion Inhibition of C38 Carbon Steel In 1M HCl: Experimental and Theoretical Study

A confirmatory study on the use of N-methyl-2-pyrrolidone (NMP) in the industrial field for cleaning metal molds and other objects, Corrosion Inhibition of C38 Carbon Steel In 1M HCl: Experimental and Theoretical Study | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article A confirmatory study on the use of N-methyl-2-pyrrolidone (NMP) in the industrial field for cleaning metal molds and other objects, Corrosion Inhibition of C38 Carbon Steel In 1M HCl: Experimental and Theoretical Study Nazih asoufar, Hicham zgueni, Mohammed El Mesky, Mohamed Tanghorte, and 8 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6244508/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 26 Jun, 2025 Read the published version in Journal of Bio- and Tribo-Corrosion → Version 1 posted 15 You are reading this latest preprint version Abstract This study presents a comprehensive investigation of N-methyl-2-pyrrolidone (NMP) as a corrosion inhibitor for carbon steel (C38) in a 1.0 M HCl environment, using both theoretical and experimental approaches. To the best of our knowledge, this is the first time NMP has been studied for its anticorrosive properties. Electrochemical tests, conducted with an SP150 potentiostat and a three-electrode system, revealed that NMP effectively inhibits corrosion through cathodic protection. The adsorption of NMP onto the steel surface follows a Langmuir isotherm model, confirmed by both stationary and transient studies. The results showed a significant increase in polarization resistance, with a maximum inhibition efficiency of 76.82% at a concentration of 10⁻² M. Theoretical analysis using Density Functional Theory (DFT) indicated a substantial energy gap (Egap = 6.293 eV) between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO), validating the experimental findings. Molecular dynamics (MD) simulations further demonstrated the stable adsorption of NMP on the steel surface, with an adsorption energy of -606.103 kcal/mol. Additionally, Natural Bond Orbitals (NBO) analysis provided insights into the molecular interactions and bonding characteristics. Overall, these results confirm that NMP is an effective corrosion inhibitor for carbon steel, offering valuable insights into its adsorption mechanism and potential industrial applications. N-methyl-2-pyrrolidone corrosion inhibition Langmuir isotherm Density Functional Theory molecular dynamics Natural Bond Orbitals Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 26 Jun, 2025 Read the published version in Journal of Bio- and Tribo-Corrosion → Version 1 posted Editorial decision: Revision requested 11 Apr, 2025 Reviews received at journal 11 Apr, 2025 Reviews received at journal 10 Apr, 2025 Reviews received at journal 10 Apr, 2025 Reviews received at journal 07 Apr, 2025 Reviewers agreed at journal 23 Mar, 2025 Reviews received at journal 22 Mar, 2025 Reviewers agreed at journal 22 Mar, 2025 Reviewers agreed at journal 21 Mar, 2025 Reviewers agreed at journal 21 Mar, 2025 Reviewers agreed at journal 21 Mar, 2025 Reviewers invited by journal 21 Mar, 2025 Editor assigned by journal 20 Mar, 2025 Submission checks completed at journal 18 Mar, 2025 First submitted to journal 17 Mar, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-6244508","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":432691694,"identity":"0596edbb-017b-40bc-bb59-9addd5b9bdbf","order_by":0,"name":"Nazih asoufar","email":"","orcid":"","institution":"University of Moulay Ismail of Meknès","correspondingAuthor":false,"prefix":"","firstName":"Nazih","middleName":"","lastName":"asoufar","suffix":""},{"id":432691695,"identity":"4e48ef12-fe91-482c-968f-2aaa71bcec2e","order_by":1,"name":"Hicham zgueni","email":"","orcid":"","institution":"University of Moulay Ismail of 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