The paper outlines the cavitation erosion of ductile materials. Cavitation erosion studies on aluminum in ordinary tap water and degassed water are presented. The mean depth of erosion (MDE) in degassed water was higher that in tap water. The mean depth of erosion in degassed water presents a peak and than decreased continuously with time, but the maximum erosion rate in tap water in first stage of the process remained approximately constant and than starts increase. It is highlighted the tempering of the superficial layer and cavitations effects are presented as well as the appreciation parameters of cavitation destruction.
