In-depth evaluation of pyran derivatives for mild steel corrosion protection in 1.0 M HCl: An experimental and theoretical analysis

In-depth evaluation of pyran derivatives for mild steel corrosion protection in 1.0 M HCl: An experimental and theoretical analysis | 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 In-depth evaluation of pyran derivatives for mild steel corrosion protection in 1.0 M HCl: An experimental and theoretical analysis A. El karkouri, K. Dahmani, O. Kharbouch, M. Khattabi, F. El hajri, and 6 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4858482/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 01 Mar, 2025 Read the published version in Journal of Bio- and Tribo-Corrosion → Version 1 posted 7 You are reading this latest preprint version Abstract The corrosion inhibition properties of two inhibitors, 2-Amino-4-(4-chlorophenyl)-3-cyano-7,7-dimethyl-5-oxo-4H-5,6,7-tetrahydrobenzo[b] pyran (ZE1-4-Cl) and 2-Amino-3-cyano-4-(4-nitrophenyl)-7,7-dimethyl-5-oxo-4H-5,6,7,8-tetrahydrobenzo[b] pyran (ZE2-4- NO 2 ), on mild steel in a 1.0 M HCl solution was evaluated using Tafel polarization and Electrochemical Impedance Spectroscopy (EIS). The inhibitory efficiency increases with decreasing temperature. Additionally, the inhibitory efficiency also increases with increasing inhibitor concentration. Notably, the better inhibitor of the two (ZE2-4- NO 2 ) achieves an efficiency of 93.7% at a temperature of 298 K and an optimal concentration of 10 − 3 M. The adsorption of both inhibitors on the steel surface was found to follow the Langmuir model, and the polarization study shows that both compounds are adsorbed to the metal surface through chemical bonding (chemisorption) following the Langmuir isotherm. The experimental results reveal that these organic compounds are effective corrosion inhibitors in a 1.0 M HCl solution. SEM and Energy Dispersive X-Ray Analysis (EDS) were employed to confirm the presence of a barrier layer enveloping the mild steel, contributing to surface characterization. Notably, interactions with the iron surface are primarily facilitated by inhibitors possessing electron-accepting properties, as evidenced by DFT results and molecular dynamic (MD) simulations. Corrosion inhibition Electrochemistry Adsorption Interfacial mechanism DFT/MD simulation Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 01 Mar, 2025 Read the published version in Journal of Bio- and Tribo-Corrosion → Version 1 posted Editorial decision: Revision requested 18 Dec, 2024 Reviews received at journal 18 Oct, 2024 Reviewers agreed at journal 10 Oct, 2024 Reviewers invited by journal 08 Oct, 2024 Editor assigned by journal 08 Aug, 2024 Submission checks completed at journal 08 Aug, 2024 First submitted to journal 04 Aug, 2024 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-4858482","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":341363226,"identity":"8249d9f5-573f-4cc9-b91d-c5feeae974a9","order_by":0,"name":"A. 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The inhibitory efficiency increases with decreasing temperature. Additionally, the inhibitory efficiency also increases with increasing inhibitor concentration. Notably, the better inhibitor of the two (ZE2-4- NO\u003csub\u003e2\u003c/sub\u003e) achieves an efficiency of 93.7% at a temperature of 298 K and an optimal concentration of 10\u003csup\u003e\u0026minus;\u0026thinsp;3\u003c/sup\u003eM. The adsorption of both inhibitors on the steel surface was found to follow the Langmuir model, and the polarization study shows that both compounds are adsorbed to the metal surface through chemical bonding (chemisorption) following the Langmuir isotherm. The experimental results reveal that these organic compounds are effective corrosion inhibitors in a 1.0 M HCl solution. SEM and Energy Dispersive X-Ray Analysis (EDS) were employed to confirm the presence of a barrier layer enveloping the mild steel, contributing to surface characterization. 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