On the potential of acoustic emission for the characterization and understanding of mechanical damaging during abrasion–corrosion processes

Monitoring acoustic emission (AE) energy in slurry impingement using a new model for particle impact

“…[2][3][4] have shown a correlation between the rate of dissipation of the kinetic energy of impact and the rate of material removal. Also, there is a general agreement that the AE energy associated with particle impingement is proportional to the incident kinetic energy 2 1 2 mv [1,[5][6][7][8]. Therefore, the measurement of AE energy associated with particle-laden liquid impingement seems likely to offer a means of monitoring slurry erosion.…”

Monitoring acoustic emission (AE) energy of abrasive particle impacts in a slurry flow loop using a statistical distribution model

“…A number of studies [2][3][4] have shown a correlation between the rate of dissipated incident kinetic energy due to particle impact and the rate of material removal. Also, amongst researchers in applications of Acoustic Emission (AE) monitoring, there is a general agreement that the AE energy associated with particle impingement is proportional to the incident kinetic energy [1,[5][6][7][8], where the relevant mass, m, and velocity, vi, may be for an individual particle or, more often, an assemblage of particles. Therefore, the measurement of AE energy associated with particle-laden liquid impingement seems likely to offer a quantitative means of monitoring sand particle impacts and hence slurry erosion.…”

“…Based on the established theory that the main cause of erosion is due to the fraction of impact energy transmitted to the target material, many researchers have attempted to characterize the mechanical damage during the abrasion-corrosion process with the aid of AE measurements and an electrochemical device. Ferrer et al [16,17] have attempted to characterise the mechanical damage due to single and multiple particle impacts by monitoring impingement in a slurry jet rig with an AE sensor coupled onto the back face of a 304L stainless steel target varying the fluid flow rate (1-16 ms -1 ), particle concentration (1-8 wt%), and angle of impact (30°-90°). They observed a linear correlation between AE energy and particle impact KE, and also showed that the measured cumulative AE energy is proportional to the material weight loss.…”

“…In the case of particle-laden flows, the phenomenon of interest is particle impact with the containment walls, although there may well be other sources (such as that caused by turbulent flow) which constitute noise. Ferrer et al [16] demonstrated a relationship between particle launch kinetic energy and AE energy by making measurements on single particle impacts prior to their slurry impingement studies [17], and have published an AE record which purports to show single particle impacts, although it is not clear what impingement conditions were represented. Ukpai et al [20] have also published raw AE records showing what they claim to be single impact events in slurry flows, although they stop short of determining the yield (particle launch rate to impact event rate).…”

Pitting Corrosion Monitoring Using Acoustic Emission

“…In addition, the AE sources are corrosion activity and the hydrogen bubble occurrence on an electrode (Mansfield & Stocker, 1979). The frequency analysis of AE signals in the abrasion corrosion process was studied and it was concluded that the sources of AE are the impact of glass beads and gas bubbles (Ferrer, 1999 Recently, researches in AE for source identification were proposed. Passive film breakage, bubble formation and the other actions in the corrosion process were considered as sources of the AE signal (Mirakowski, 2010).…”