A review of advancement in fluorescence-based corrosion detection for metals and future prospects

Fluorescence-based corrosion detection is an emerging method for surveillance in the early stages of metal corrosion. It is valued for its great responsiveness, non-invasive nature, and capability of in-situ and simultaneous detection. This review paper presents a thorough and up-to-date review of fluorescence-based methods for detecting metal corrosion. It introduces the underlying principles of these detection methods, aligned with the corrosion processes of metals. The paper categorizes fluorescent indicators into those sensitive to pH changes and those responsive to metal ions, both serving as early indicators of corrosion. It also discusses the factors influencing the sensitivity of fluorescence detection and various methods of incorporating fluorescent indicators. Lastly, the paper outlines critical future directions for the betterment of fluorescence-based corrosion diagnosis.