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We analyze the main aspects of acoustic-emission diagnostics of the corrosion processes in structural materials and present the results of numerical investigations of the electrochemical corrosion by the method of acoustic emission. We also discuss the applicability of the method to the investigation of the corrosion fatigue of materials. [ABSTRACT FROM AUTHOR]

The features of magnetoelastic acoustic emission (MAE) generation in the low-carbon (ferritic-pearlitic) steels during their magnetization by an external quasi-static magnetic field are investigated. The influence of elastic stresses, plastic deformations, volume damage of the material, heat treatment as well as the carbon content in iron alloys and the volume of remagnetization on the sum of the MAE signals amplitudes is established. An increase of the magnetization volume and heat treatment lead to an increase of the sum of the MAE signals amplitudes. The other factors cause its decrease compared to the state of supply of the ferromagnet. The obtained results are important for the construction of methods for assessing the local degradation of equipment materials of pipeline networks. • Elastic stresses and plastic deformation of steel reduce the MAE activity. • Volume damage of steels affect MAE generation. • The increase of the carbon percent in the iron alloys decreases the MAE activity. • The MAE activity increases after full annealing of low-carbon steels. • The MAE method is effective tool for the analysis of the ferromagnet state. [ABSTRACT FROM AUTHOR]