The first works concerned with using acoustic emission to monitor corrosion evolving phenomena have been published more than twenty years go. Today, the potential of this technique for corrosion applications is recognized by a lot of people. However, a rapid review of the last five years corrosion related publications shows that there is a real lack in promoting the interest of acoustic emission compared to others "new" techniques like electrochemical noise analysis or electrochemical
impedance spectroscopy. The purpose of the present paper is to remind the principle advantages of acoustic emission and to show how it can be used to help for numerous industrial problems like predictive maintenance or process monitoring. It is illustrated by laboratory and on plant monitoring cases of different aqueous corrosion phenomena : stress corrosion cracking, erosion-corrosion and pitting corrosion. It is shown that in well-controlled acquisition conditions, numerous corrosion
phenomena can be studied on plant even in high noisy environment.
Keywords : Acoustic emission, stress corrosion cracking, pitting corrosion, erosion-corrosion, monitoring.