{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T10:57:50Z","timestamp":1781261870152,"version":"3.54.1"},"reference-count":37,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T00:00:00Z","timestamp":1781222400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>To address the uneven deposition of zirconium conversion coatings on multiphase 55AlZnMg under short pretreatment cycles, this study investigated the time-dependent formation behavior of ZrCC in a selected H2ZrF6 bath. By precisely controlling the immersion time (20\u201390 s) and utilizing SEM-EDS and AFM characterization techniques, this study systematically revealed the growth kinetics and film-forming mechanisms of ZrCC on complex alloy surfaces. The results indicate that the Zn-rich phase on the surface of the 55AlZnMg coating, due to its relatively positive potential, preferentially induces the deposition of the film-forming material. Subsequently, dealloying occurs in the Al-rich phase and the Mg\/Zn enriched regions, forming Zn-enriched regions that promote the continuous deposition of the film-forming material, ultimately achieving complete surface coverage; the film morphology evolves from an initial needle-like structure to a network structure, eventually forming a nanosheet structure. The film-forming process of ZrCC on the 55AlZnMg substrate surface is primarily driven by selective growth, with electrochemical properties of the alloy phases, significantly enhancing adhesion between the aluminum-zinc-magnesium coating and the overcoat and providing practical guidance for improving surface uniformity and interfacial adhesion of Al-Zn-Mg-coated steel.<\/jats:p>","DOI":"10.3390\/ma19122545","type":"journal-article","created":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T09:49:51Z","timestamp":1781257791000},"page":"2545","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Rapid Formation and Interfacial Adhesion Enhancement in Zirconium Conversion Coatings on 55AlZnMg-Coated Steel Under a Short H2ZrF6 Pretreatment"],"prefix":"10.3390","volume":"19","author":[{"given":"Xiaonan","family":"Zhang","sequence":"first","affiliation":[{"name":"Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weixi","family":"Zhao","sequence":"additional","affiliation":[{"name":"Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lin","family":"Lu","sequence":"additional","affiliation":[{"name":"Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,12]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"108482","DOI":"10.1016\/j.corsci.2020.108482","article-title":"Chromium Valence Change in Trivalent Chromium Conversion Coatings on Aluminium Deposited under Applied Potentials","volume":"167","author":"Qi","year":"2020","journal-title":"Corros. 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