| DU Juan,WEI Shi-jun,SHI Yu-chao,LIU Li-ping,WANG Hong-yu,SONG Hai-peng.Progress of Application and Mechanism of Fluorescent Probes in Coating[J],52(10):99-114, 140 |
| Progress of Application and Mechanism of Fluorescent Probes in Coating |
| Received:July 25, 2022 Revised:November 12, 2022 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.10.007 |
| KeyWord:fluorescent probe coating mechanism corrosion self-warning |
| Author | Institution |
| DU Juan |
Civil Aviation University of China, Tianjin , China |
| WEI Shi-jun |
Civil Aviation University of China, Tianjin , China |
| SHI Yu-chao |
Beijing Machine and Equipment Institute, Beijing , China |
| LIU Li-ping |
Civil Aviation University of China, Tianjin , China |
| WANG Hong-yu |
Civil Aviation University of China, Tianjin , China |
| SONG Hai-peng |
Civil Aviation University of China, Tianjin , China |
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| Abstract: |
| Loading fluorescent probes into the coating can give the coating special fluorescence response performance, which is widely used in metal corrosion, metal high temperature monitoring and anti-counterfeiting encryption. The preparation technology and related applications of fluorescent probes in coatings at home and abroad were introduced, and the research progress of the mechanism of fluorescent probes used in coatings was discussed. The types of coatings applied to fluorescent probes included anti-corrosion coatings, thermal barrier coatings, and anti-counterfeiting coatings. The role of fluorescent probes in three coatings was described. Based on these three coating types, the preparation technology and function of fluorescent probes for coating were described. The mechanism of action of fluorescent probes in three types of coatings was clarified, and the future development direction was pointed out. The fluorescent probe was used for anti-corrosion coatings, which could give the coating a special function and play a self-warning role in corrosion; Fluorescent probes were used for thermal barrier coatings, which were mainly used to monitor and analyze high-temperature environments; The fluorescent probe was used for anti-counterfeiting coatings, mainly used for anti-counterfeiting encryption and storage, anti-counterfeiting identification of valuables, etc. The mechanism of pH-responsive fluorescent probe was mainly to use substances that were sensitive to pH value changes to produce fluorescence after interacting with hydrogen ions or hydroxide ions at the cathode of the corroded microregion, which provided early warning for the early corrosion of metal materials. The mechanism of corrosion ion-responsive fluorescent probes was mainly to fluoresce after the fluorescence probe interacted with the metal ions generated by the corrosion micro-anode, so as to predict the early corrosion of metals. The mechanism of mechanical damage-responsive fluorescent probes mainly referred to the chemical changes and color of fluorescent probes released after the microcapsule was damaged under the action of mechanical damage, to indicate the occurrence of early corrosion. The mechanism of fluorescent probe for thermal barrier coating was mainly under the excitation of ultraviolet/visible light source, the phosphorescent layer generated a phosphorescence signal with characteristic temperature correlation, and the temperature information of the position of the phosphorescent layer was obtained by measuring the phosphorescence signal, so as to measure the temperature of the surface, interior and interface of the ceramic base/adhesive layer of the thermal barrier coating. The mechanism of thermal color-changing anti-counterfeiting coating was to add substances whose color changes with temperature to the coating; The mechanism of photochromic anti-counterfeiting coating was to add photochromic or photoactivated compounds to the coating; The mechanism of moisture-sensitive color-changing anti- counterfeiting coating was to add substances whose color changed with humidity to the coating; The mechanism of pressure- sensitive color-changing anti-counterfeiting coating was to add pressure-induced chromic compounds or microcapsules to the coating. According to the current research results, the application of fluorescent probes in the field of coatings still faces the following problems. In the field of anti-corrosion coatings, future research should focus on the integration of self-warning and self-healing functions, and the preparation of composite coatings with "self-warning/self-repair" dual functions. In the field of thermal barrier coatings, the upper limit of fluorescence temperature measurement still needs to be widened; The stability of temperature measurement still needs to be further improved; It is required to ensure the stability of the mechanical properties of the coating structure in the service environment. In the field of anti-counterfeiting encryption coatings, it is necessary to further explore and solve the "premature fluorescence phenomenon", and at the same time be able to cope with changing stimuli and improve the practical application of anti-counterfeiting encryption coatings. |
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