Zirconium-based surface treatment for welded aluminium alloys: overcoming phosphating limitations prior to organic coating

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dc.authorid0000-0001-7557-9617
dc.contributor.authorOzyurt, Gulcan
dc.contributor.authorUsta, Ibrahim
dc.date.accessioned2026-02-08T15:15:31Z
dc.date.available2026-02-08T15:15:31Z
dc.date.issued2026
dc.departmentBursa Teknik Üniversitesi
dc.description.abstractThis study evaluates a Zirconium-based conversion coating as an eco-friendly alternative to conventional phosphating for welded aluminium alloys. Conventional phosphating often results in uneven coatings on high-silicon alloys and welded areas, reducing adhesion and corrosion resistance. The proposed chromium-, nickel-, and phosphate-free pretreatment contains hexafluorozirconic acid, organic silanes, stabilisers, and complexing agents, forming a thin, amorphous zirconium oxide layer that enhances paint adhesion and corrosion protection. The coating system was applied to 3103 and 5754 aluminium alloys and evaluated in two configurations: cataphoresis alone and a duplex system of cataphoresis followed by wet paint application. Compared to phosphating, salt spray tests and surface analyses showed that the Zirconium-based treatment provides more uniform coatings, better adhesion, and significantly improved corrosion resistance. These results demonstrate the method's technical effectiveness and environmental compliance, making it a promising surface preparation technique for automotive and industrial applications.
dc.identifier.doi10.1080/00202967.2025.2578889
dc.identifier.endpage41
dc.identifier.issn0020-2967
dc.identifier.issn1745-9192
dc.identifier.issue1
dc.identifier.scopus2-s2.0-105022266176
dc.identifier.scopusqualityQ2
dc.identifier.startpage33
dc.identifier.urihttps://doi.org/10.1080/00202967.2025.2578889
dc.identifier.urihttps://hdl.handle.net/20.500.12885/5825
dc.identifier.volume104
dc.identifier.wosWOS:001616071500001
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherTaylor & Francis Ltd
dc.relation.ispartofTransactions of The Institute of Metal Finishing
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzWOS_KA_20260207
dc.subjectZirconium-based coating
dc.subjectaluminium alloys
dc.subjectsurface pretreatment
dc.subjectcataphoresis
dc.subjectcorrosion resistance
dc.subjectphosphate-free system
dc.titleZirconium-based surface treatment for welded aluminium alloys: overcoming phosphating limitations prior to organic coating
dc.typeArticle

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