Abstract: This article provides a review of evaluation of pitting corrosion in steel using acoustic emission. Researchers have shown that the acoustic technique is a suitable tool for detecting pitting both under laboratory conditions and in field. Although there are different opinions over acoustic signal generation, it is generally agreed that acoustic activity increases with expansion of pits, and correlation exists between acoustic activity and pitting rate. Based on research of the application of AE to pitting corrosion, preliminary results have been obtained in this area.