Moire based method for real-time crevice corrosion monitoring

A novel real-time technique was developed to monitor localized corrosion occurring over a metal surface. It is an optical method based on the Moire technique that has undergone further improvements and fine tuning for more accurate measurements. Upon testing, good agreements were obtained with the microscopically determined penetration depth. Application for this technique was demonstrated through real-time monitoring of crevice corrosion activity occurring on the surface of AISI 316 (UNS S31600) stainless steel immersed in 3% NaCI at 60 degrees C. The crevice was an artificial clear glass/metal crevice with a gap thickness of 5 mu m. Based on the findings of these results it was shown that this method can effectively and accurately be used to monitor crevice corrosion.