Caractérisation de la corrosion d’acier par la méthode ultrasonore en mode de réflexion

Abstract

Abstract. The ultrasonic method is widely used to detect and characterize internal defects, but also to measure the residual thickness in the presence of corrosive or erosive phenomena. In this work, we have exploited: the ultrasonic reflection technique using a transducer center frequency 5MHz, which aims to deduct the ultrasonic parameters of samples, and tracing the reflection coefficient for each experimental sample. This work has demonstrated the reliability and the ability of ultrasonic techniques to show the influence of immersion time in a corrosive solution. The resulting corrosion on the corroded steel was analyzed by monitoring the evolution of ultrasonic parameters. We confirm some of the results found by other researchers ([1 Nomenclature :e : l'épaisseur de la plaque en mm L: la largeur de la plaque en cm l : la longueur de la plaque en cm ȡ: la masse volumique en Kg/m 3 t : la durée d'immersion de la plaque dans HCl (5N)