Corrosion properties of high-speed laser-clad Alloy 625 coatings on low-alloy steels and cast irons

Corrosion properties of high-speed laser-clad Alloy 625 coatings on low-alloy steels and cast irons | 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 Corrosion properties of high-speed laser-clad Alloy 625 coatings on low-alloy steels and cast irons Jari Tuominen, Jouko Kiviö, Mari Honkanen, Pasi Peura This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-6200284/v2 This work is licensed under a CC BY 4.0 License Status: Posted Version 2 posted You are reading this latest preprint version Show more versions Abstract Fusion-bonded and low-diluted overlay welded coatings are frequently very thick (> 1mm), which results in high material consumption (kg/m 2 ) and expenses. High-speed laser cladding is a novel process that produces thin fusion-bonded and low-diluted coatings with high coverage rates and low heat input. In this paper, high-speed laser cladding was employed to fabricate relatively thin Ni-based Alloy 625 coatings from various powder feedstocks on low-alloy steels and cast irons for corrosion protection. Obtained coatings were characterized by optical microscopy (OM), scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), X-ray diffraction (XRD), optical surface profilometry, and Vickers microhardness method. Corrosion performances were explored in long-term salt spray tests in a chloride-containing atmosphere. The results demonstrate that low-diluted and defect-free Ni-based coatings protect the base materials in salt spray tests. Powder feedstocks, which included impurities, produced hot cracks in the clads, which resulted in poor corrosion performance. Materials Engineering High-speed laser cladding Alloy 625 spherical graphite cast iron grey cast iron corrosion hot cracking Full Text Additional Declarations The authors declare no competing interests. Cite Share Download PDF Status: Posted Version 2 posted You are reading this latest preprint version Show more versions 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-6200284","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":428216722,"identity":"7df7b23a-13bb-4d56-8473-941ad9a1d772","order_by":0,"name":"Jari Tuominen","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA3UlEQVRIiWNgGAWjYBACxgYGhgNgFjOIqIAwPiQQ1JIA03LGAMRgnIFPCwTAVDC2GYCpGfgUM7effXiA8cdhOd123oOPC+f9SdzODrT6AT6H9aQbAB122NjsMF+y8cxtBok7m4Fa8PslDeSXw4nbDvOYSfMCtWw4zMD+AK+W/mdwLea/eeeAtRCwZQaSLcy8DURpAdqSkJYO9AuPsTTPMWPjDYcZG/FqMexPY/7wwcZazuz8GcPPPDVyshvOHz7Y+AOflgYGRLTAbG7Ao4GBQR6v7CgYBaNgFIwCEAAAwFRO9btZHlAAAAAASUVORK5CYII=","orcid":"","institution":"Tampere University","correspondingAuthor":true,"prefix":"","firstName":"Jari","middleName":"","lastName":"Tuominen","suffix":""},{"id":428216723,"identity":"f93cb09c-cea1-48e7-ba71-2c9c1556b075","order_by":1,"name":"Jouko Kiviö","email":"","orcid":"","institution":"Tampere University","correspondingAuthor":false,"prefix":"","firstName":"Jouko","middleName":"","lastName":"Kiviö","suffix":""},{"id":428216724,"identity":"561920ad-219d-4a3c-b6ac-a3523544404a","order_by":2,"name":"Mari Honkanen","email":"","orcid":"","institution":"Tampere University","correspondingAuthor":false,"prefix":"","firstName":"Mari","middleName":"","lastName":"Honkanen","suffix":""},{"id":428216725,"identity":"b84471c3-9f60-44bd-b3bc-f031d984d6ca","order_by":3,"name":"Pasi Peura","email":"","orcid":"","institution":"Tampere University","correspondingAuthor":false,"prefix":"","firstName":"Pasi","middleName":"","lastName":"Peura","suffix":""}],"badges":[],"createdAt":"2025-03-11 05:25:03","currentVersionCode":2,"declarations":{"humanSubjects":false,"vertebrateSubjects":false,"conflictsOfInterestStatement":false,"humanSubjectEthicalGuidelines":false,"humanSubjectConsent":false,"humanSubjectClinicalTrial":false,"humanSubjectCaseReport":false,"vertebrateSubjectEthicalGuidelines":false},"doi":"10.21203/rs.3.rs-6200284/v2","doiUrl":"https://doi.org/10.21203/rs.3.rs-6200284/v2","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":91148058,"identity":"5a78951c-1050-43d0-aea0-8d1cd74e7904","added_by":"auto","created_at":"2025-09-12 06:41:40","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":2821061,"visible":true,"origin":"","legend":"","description":"","filename":"Tuominenetal062025WiTWRevisedclean.pdf","url":"https://assets-eu.researchsquare.com/files/rs-6200284/v2_covered_16818113-48d1-4686-8a38-d40a95bd6583.pdf"}],"financialInterests":"The authors declare no competing interests.","formattedTitle":"Corrosion properties of high-speed laser-clad Alloy 625 coatings on low-alloy steels and cast irons","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":true,"highlight":"","institution":"Tampere University","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"High-speed laser cladding, Alloy 625, spherical graphite cast iron, grey cast iron, corrosion, hot cracking","lastPublishedDoi":"10.21203/rs.3.rs-6200284/v2","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-6200284/v2","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"\u003cp\u003eFusion-bonded and low-diluted overlay welded coatings are frequently very thick (\u0026gt;\u0026thinsp;1mm), which results in high material consumption (kg/m\u003csup\u003e2\u003c/sup\u003e) and expenses. High-speed laser cladding is a novel process that produces thin fusion-bonded and low-diluted coatings with high coverage rates and low heat input. In this paper, high-speed laser cladding was employed to fabricate relatively thin Ni-based Alloy 625 coatings from various powder feedstocks on low-alloy steels and cast irons for corrosion protection. Obtained coatings were characterized by optical microscopy (OM), scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM), X-ray diffraction (XRD), optical surface profilometry, and Vickers microhardness method. Corrosion performances were explored in long-term salt spray tests in a chloride-containing atmosphere. The results demonstrate that low-diluted and defect-free Ni-based coatings protect the base materials in salt spray tests. 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