Abstract: ［Objective］To develop an intrinsic fluorescence-based monitoring strategy utilizingpolyamide 650 curing agent for real-time tracking of curing，aging，corrosion，and damage behaviors in epoxy coatings， enabling non-destructive service-life assessment.［Methods］The inherent fluorescence of polyamide 650 was employed to dynamically analyze curing and aging processes ofepoxy coatings via fluorescence spectroscopy. Corrosion behavior in 3. 5%NaCl solution was characterized using electrochemical impedance spectroscopy（EIS）. Damage and corrosion zones were visualized through UV-excited fluorescence imaging.［Results］Complete curing of epoxy E51 coatings was achieved after 6 h at 80 ℃，with fluorescence intensity significantly increasing during cross-linked network formation. UV irradiation induced a rapid 20 min decline in fluorescence intensity and a 14 nmredshift in emission peaks；FT-IR confirmed amide group degradation as the primary aging mechanism. After 144 h immersion，the impedance modulus decreased to 10⁷ Ω ·cm²，synchronizing with fluorescence attenuation. Fe³⁺ generated in marine environments exhibited fluorescence quenching， enabling corrosion warning. Graphene oxide（0. 1wt%）-reinforced composite coatings demonstratedenhanced corrosion resistance with retained fluorescence-based warning capability.［Conclusion］This intrinsic fluorescence technique facilitates dynamic，full-lifecycle monitoring of epoxy coatings.Quantitative correlations between fluorescence intensity and damage/corrosion severity provide reliableservice-life indicators without compromising coating performance via external probes，showing significant promise for marine anti-corrosion applications.

Key words: epoxy coating, fluorescence, curing process, aging, corrosion, damage warning

摘要： 【目的】开发一种基于聚酰胺 650固化剂本征荧光的监测方法，实时追踪环氧涂层的固化、老化、腐蚀及损伤行为，为评估涂层寿命提供无损检测策略。【方法】利用聚酰胺 650的固有荧光特性，通过荧光光谱动态分析环氧涂层的固化与老化过程；结合电化学阻抗谱（ EIS）研究涂层在 3. 5%NaCl溶液中的腐蚀行为；通过紫外荧光成像可视化损伤与腐蚀区域。【结果】环氧 E51涂层需 80 ℃加热 6h完全固化，荧光强度随交联网络形成显著上升；紫外光照导致荧光强度 20 min内快速下降，发射峰红移 14 nm，傅立叶变换红外光谱（ FT-IR）证实酰胺基团降解是老化主因；涂层浸泡 144 h后低频阻抗模值降至 10⁷ Ω·cm²与荧光强度衰减趋势相吻合；海洋腐蚀环境下产生的 Fe³⁺对涂层有淬灭效应，可示警腐蚀，添加 0. 1%氧化石墨，烯的复合涂层耐腐蚀性提升，且荧光示警有效。【结论】本征荧光技术实现了环氧涂层全生命周期的动态监测，荧光强度与损伤 /腐蚀程度的定量关系为服役评估提供了可靠依据，无需外添探针即可保障涂层性能，在海洋防腐等领域具有应用潜力。

关键词: 环氧涂层, 荧光, 固化过程, 老化, 腐蚀, 损伤示警

CLC Number: 

• TQ635. 2