Insight into the synergetic effect of alanine-derived copolymer and KI on the corrosion inhibition of SLM manufactured 17-4 PH steel in acidified NaCl solution

Insight into the synergetic effect of alanine-derived copolymer and KI on the corrosion inhibition of SLM manufactured 17-4 PH steel in acidified NaCl solution | 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 Insight into the synergetic effect of alanine-derived copolymer and KI on the corrosion inhibition of SLM manufactured 17-4 PH steel in acidified NaCl solution Pramod kumar uppalapati, Krishnasamy Velmurugan, R. Karthick, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6436091/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 29 Aug, 2025 Read the published version in Progress in Additive Manufacturing → Version 1 posted You are reading this latest preprint version Abstract The 17 − 4 precipitation hardening (PH) stainless steel, produced by additive manufacturing (AM), provides an exceptional balance of strength, toughness, and corrosion resistance, making it a versatile engineering alloy, especially in the aerospace sector. Nonetheless, microstructural defects that occur during manufacturing adversely affect its application in structural contexts, particularly concerning corrosion issues. In the current study, a novel Alanine-derived water-soluble copolymer referred to as L-1 was synthesized, characterized and its ability to suppress corrosion of SLM printed 17 − 4 PH steel in an acidified NaCl solution is examined. Electrochemical and surface characterizations and computational methods were systematically utilized to explore individual inhibitors' inhibitory efficacy and synergistic effects and their blends with potassium iodide (KI). Based on the electrochemical outcomes, the synergistic mixture of L-1/KI (hybrid inhibitor) gave an impressive rate of corrosion inhibition efficiency than that of individual and blank ones. An index of synergism greater than one showcases a more significant potential for passivation (hybrid inhibitor) in mitigating corrosion progression. The adsorption or chelation of an inhibitive co-polymer film on the metal surface was examined utilizing X-ray photoelectron spectroscopy (XPS), FT-IR, and UV vis analyses. An examination of surface morphology using SEM and AFM revealed a smooth surface, devoid of conspicuous corrosion features in the presence of the co-polymer, more prominent with the blend. Quantum chemical (QC) calculations and Mulliken charge analysis indicate that active centers for the heightened corrosion inhibitory efficiency are predominantly located on benzene rings and alanine pendant groups. The combined experimental-theoretical approach highlights the effectiveness of hybrid water-soluble copolymer inhibitors as novel and efficient corrosion inhibitors within the realm of sustainable chemistry. SLM 17 − 4 PH steel Copolymers Adsorption Density functional theory synergetic inhibition Full Text Additional Declarations No competing interests reported. Supplementary Files supplementary174.pdf graphicalabstract.jpg Cite Share Download PDF Status: Published Journal Publication published 29 Aug, 2025 Read the published version in Progress in Additive Manufacturing → Version 1 posted 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-6436091","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":448145352,"identity":"ee443c9d-bcd7-4bb7-a728-bb10855ac845","order_by":0,"name":"Pramod kumar uppalapati","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA4UlEQVRIiWNgGAWjYNACtv88jPMfHwCyJGSI1cIsw9yQlgDSwkO0Fhv2hhwDEJOwFnPpw083fChj4+FtOPP51Y0aCx4G9sNHN+DTYtmXZnZzxjkeHsnG3m3WOceADuNJS7uBT4vBGQaz27xtEjyGzbzbjHPYgFokeMwIaGH/BtRiwGN/jOeZcc4/orTwgGxJ4GHs4WF+nNtGhBbLHp4yoF8O8DDOYDNjzu2T4GEj5BdzHvZtNz6UHbBnnMH8+HPOtzo5fvbDx/A7DInNJgEm8SlH18L8gZDqUTAKRsEoGJkAAI4eRNNejNbEAAAAAElFTkSuQmCC","orcid":"","institution":"Southern University of Science and Technology","correspondingAuthor":true,"prefix":"","firstName":"Pramod","middleName":"kumar","lastName":"uppalapati","suffix":""},{"id":448145353,"identity":"238cd73e-bf0b-41cb-83fb-2f5865ce3c49","order_by":1,"name":"Krishnasamy Velmurugan","email":"","orcid":"","institution":"Nanjing University of Aeronautics and Astronautics","correspondingAuthor":false,"prefix":"","firstName":"Krishnasamy","middleName":"","lastName":"Velmurugan","suffix":""},{"id":448145354,"identity":"4047ed7c-c7d8-4df6-be39-ee7510a15d94","order_by":2,"name":"R. 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Nonetheless, microstructural defects that occur during manufacturing adversely affect its application in structural contexts, particularly concerning corrosion issues. In the current study, a novel Alanine-derived water-soluble copolymer referred to as L-1 was synthesized, characterized and its ability to suppress corrosion of SLM printed 17\u0026thinsp;\u0026minus;\u0026thinsp;4 PH steel in an acidified NaCl solution is examined. Electrochemical and surface characterizations and computational methods were systematically utilized to explore individual inhibitors' inhibitory efficacy and synergistic effects and their blends with potassium iodide (KI). Based on the electrochemical outcomes, the synergistic mixture of L-1/KI (hybrid inhibitor) gave an impressive rate of corrosion inhibition efficiency than that of individual and blank ones. An index of synergism greater than one showcases a more significant potential for passivation (hybrid inhibitor) in mitigating corrosion progression. 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