Application of the Magnetoelastic Acoustic Emission for the Corrosion Investigations of Steels

We perform the experimental investigation of the influence of hydrogen sulfide on the signals of magnetoelastic acoustic emission (MAE). The action of hydrogen-sulfide media on the parameters of МАЕ signals of reversely magnetized specimens of 15 steel and 2 steel after holding in these media for 173 h at room temperature is investigated. The degraded structure of the material causes a decrease in the mobility of non-180° domain walls because the number of their pinning centers increases and, as a result, the sum of amplitudes of the MAE signals in damaged specimens decreases.