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Early recognition of micro\u2010defect initiation and real\u2010time damage monitoring remain formidable challenges due to the difficulty in detecting sub\u2010surface micro\u2010damage. Herein, we present a sandwich\u2010structured thermochromic smart coating that enables preemptive, visual detection of frictional heating prior to irreversible damage. The coating integrates silica\u2010encapsulated thermochromic microcapsules (TC@SiO\n                    <jats:sub>2<\/jats:sub>\n                    ) comprising crystal violet lactone (CVL), bisphenol A (BPA), and n\u2010hexadecanol as a responsive sensing layer between polyurea (top) and epoxy (bottom) matrices. Upon frictional heating, electron transfer between CVL and BPA induces C\u2500O\u2500C bond cleavage and chromophore disruption, triggering a solid\u2010liquid phase transition and color fading that visually warning micro\u2010damage events. Meanwhile, hydrogen\u2010bond interactions between the microcapsules and the polymer network further enhance mechanical robustness and coating integrity, yielding superior tribological performance (5.86 \u00d7 10\n                    <jats:sup>\u22125<\/jats:sup>\n                    mm\n                    <jats:sup>3<\/jats:sup>\n                    N\n                    <jats:sup>\u22121<\/jats:sup>\n                    m\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) and long\u2010term corrosion resistance (5.144 \u00d7 10\n                    <jats:sup>9<\/jats:sup>\n                    \u03a9\u00b7cm\n                    <jats:sup>2<\/jats:sup>\n                    after 70 days immersion). This work establishes a cost\u2010effective and intuitive strategy for early friction monitoring, offering a new paradigm for intelligent protection of marine structural materials.\n                  <\/jats:p>","DOI":"10.1002\/smll.202514449","type":"journal-article","created":{"date-parts":[[2026,3,8]],"date-time":"2026-03-08T22:56:42Z","timestamp":1773010602000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Preemptive Thermochromic Smart Coating for Visual Friction Damage Recognition and Corrosion Protection in Offshore Structures"],"prefix":"10.1002","volume":"22","author":[{"given":"Zhengsen","family":"Wang","sequence":"first","affiliation":[{"name":"Shandong Key Laboratory of Special Epoxy Resin College of Materials Science and Engineering Shandong University of Science and Technology  Qingdao P. R. 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China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weixiang","family":"Sun","sequence":"additional","affiliation":[{"name":"Shandong Key Laboratory of Special Epoxy Resin College of Materials Science and Engineering Shandong University of Science and Technology  Qingdao P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lanyue","family":"Cui","sequence":"additional","affiliation":[{"name":"Shandong Key Laboratory of Special Epoxy Resin College of Materials Science and Engineering Shandong University of Science and Technology  Qingdao P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuoqi","family":"Li","sequence":"additional","affiliation":[{"name":"Shandong Key Laboratory of Special Epoxy Resin College of Materials Science and Engineering Shandong University of Science and Technology  Qingdao P. R. China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1385-0269","authenticated-orcid":false,"given":"Chengbao","family":"Liu","sequence":"additional","affiliation":[{"name":"Shandong Key Laboratory of Special Epoxy Resin College of Materials Science and Engineering Shandong University of Science and Technology  Qingdao P. R. 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