Electrodeposition of Al-Mg alloys from chloride-based molten salts

Electrodeposition of Al-Mg alloys from chloride-based molten salts | 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 Article Electrodeposition of Al-Mg alloys from chloride-based molten salts Sreesvarna Bhaskaramohan, Manepalli J. N. V. Prasad, G. V. Dattu Jonnalagadda, and 1 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5631520/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 30 May, 2025 Read the published version in Scientific Reports → Version 1 posted 8 You are reading this latest preprint version Abstract Aluminum-magnesium (Al-Mg) alloys were potentiostatically electrodeposited on copper using Al anode at 180 °C from 62AlCl3+17NaCl+15KCl+6MgCl2 electrolyte. The depositions are categorized into two groups based on current density-time curves and deposit compositions. Group 1 corresponds to overpotentials from −1.05 to −1.10 V, and Group 2 from −1.15 to −1.30 V. Morphologies within Group 1 possess almost pure Al and coarsen with overpotential; while those in Group 2 possess Al and Mg, and refine with overpotential. Based on electrochemical, compositional, and spectral analyses, a generic deposition scheme is proposed. Mathematical variables in this scheme are adjusted rendering it suitable for both groups. Sources of Al for deposition are Al2Cl7-, and AlCl4-; that of Mg is MgCl2 (possibly forming complexes in electrolyte). Al anodic dissolution occurs significantly in Group 1. Na(AlCl4) formation and Cl2 evolution occur at anode in Group 2. The proposed scheme is used to devise the following corollaries: (i) Al deposits preferentially in both groups; (ii) Mg deposition is prerequisite for Na(AlCl4) formation; (iii) Deposited Mg is curtailed to maximum of ~4.02 at.% by Na(AlCl4); and (iv) A minimum threshold exists for Al/Mg deposit composition ratios. The scheme and corollaries answer questions of practical and fundamental importance. Physical sciences/Chemistry/Electrochemistry Physical sciences/Materials science/Structural materials/Metals and alloys Full Text Additional Declarations No competing interests reported. Supplementary Files SupplementaryInformation.pdf Cite Share Download PDF Status: Published Journal Publication published 30 May, 2025 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Revision requested 30 Apr, 2025 Reviews received at journal 30 Apr, 2025 Reviews received at journal 23 Apr, 2025 Reviewers agreed at journal 20 Apr, 2025 Reviewers agreed at journal 17 Apr, 2025 Reviewers invited by journal 16 Apr, 2025 Submission checks completed at journal 08 Apr, 2025 First submitted to journal 29 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. 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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-5631520","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":443748788,"identity":"b6747b34-1e0e-4bbe-8f6c-8e0e8a3af2df","order_by":0,"name":"Sreesvarna Bhaskaramohan","email":"","orcid":"","institution":"Indian Institute of Technology Bombay","correspondingAuthor":false,"prefix":"","firstName":"Sreesvarna","middleName":"","lastName":"Bhaskaramohan","suffix":""},{"id":443748789,"identity":"e910e3f2-2f60-4cf9-93a2-1cb7e94e98e0","order_by":1,"name":"Manepalli J. N. V. 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The depositions are categorized into two groups based on current density-time curves and deposit compositions. Group 1 corresponds to overpotentials from −1.05 to −1.10 V, and Group 2 from −1.15 to −1.30 V. Morphologies within Group 1 possess almost pure Al and coarsen with overpotential; while those in Group 2 possess Al and Mg, and refine with overpotential. Based on electrochemical, compositional, and spectral analyses, a generic deposition scheme is proposed. Mathematical variables in this scheme are adjusted rendering it suitable for both groups. Sources of Al for deposition are Al2Cl7-, and AlCl4-; that of Mg is MgCl2 (possibly forming complexes in electrolyte). Al anodic dissolution occurs significantly in Group 1. Na(AlCl4) formation and Cl2 evolution occur at anode in Group 2. The proposed scheme is used to devise the following corollaries: (i) Al deposits preferentially in both groups; (ii) Mg deposition is prerequisite for Na(AlCl4) formation; (iii) Deposited Mg is curtailed to maximum of ~4.02 at.% by Na(AlCl4); and (iv) A minimum threshold exists for Al/Mg deposit composition ratios. 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