Monitoring Uniform Corrosion of Storage Tank Bottom Steel by Acoustic Emission technique

摘要

Measurements of uniform corrosion of atmospheric metal storage tank bottom steel specimens byacoustic emission (AE) and electrochemical methods were carried out simultaneously in dilutedsulfuric acid (H2SO4) solution (pH=4.5). The potentiostatic polarization measurements indicated thatAE activity was positive correlation with the corrosion level. AE signal generated from uniformcorrosion was analyzed by characteristic parameters in time domain and spectrum in frequency domainrespectively, and further time-frequency local analysis was presented using the Gabor Wavelettransform (WT). The result shows that the AE technique is very sensitive to tank bottom steel uniformcorrosion, corrosion productsdeposits and movement, so that AE activity can be used to represent thecorrosion rate. These conclusions will be helpful for explaining and evaluating the on-site storage tankbottom AE testing result.