A review of fluorescence based corrosion detection of metals

Fluorescence based corrosion detection has been proposed as a prospective monitoring method for the initial corrosion of metals due to its high sensitivity, non-destructive, in situ and real-time detection. This paper provides a comprehensive and updated review on the fluorescence based corrosion detection of metals. The principles of fluorescence based corrosion detection are introduced according to the corrosion processes of metals. Fluorescent indicators in corrosion detection are classified into pH and metal ion sensitive indicators, which show fluorescence response either by the pH variation or the presence of metallic cations as an early warning for corrosion initiation. The addition manners of fluorescent indicators and influence factors of fluorescence detection sensitivity are summarized. Finally, some critical prospects of fluorescence based corrosion detection are proposed.