A fiber optic pH-sensor capable of both visualizing corrosion sites and
measuring local chemical concentrations is applied to real-time corrosion monitoring. The imaging fiber’s distal face containing an immobilized pH-sensitive fluorescentdye is brought into contact with metal surfaces submerged in aqueous buffers and fluorescence images are acquired as a function of time. The observed changes in fluorescence due to increases in pH at cathodic sites and decreases in pH at anodic sites are indicative of localized corrosion rotes.
Keywords: corrosion, galvanic, localized, imaging, pH-changes