Method and means of cavitation erosion tests under abnormal conditions

Abstract

Abstract The monitoring method for erosion resistance of metals and protective coatings under cavitation exposure in abnormal operating conditions is proposed. This method extends the scope of the standard ASTM G32-10 Standard Test Method for Cavitation Erosion Using Vibratory Apparatus. The specialized ultrasonic device has been developed for the study of cavitation destruction of materials and coatings at high pressures, temperatures up to 1000 °C and in liquid media with various properties (including aggressive ones) for implementing the monitoring method. The control system based on continuous monitoring of electric parameters of piezoelectric vibratory system was used to providing the necessary vibration amplitude in the process of cavitation under all changes of liquids parameters. The control system (based on changes monitoring of liquid active resistance) was used for equal efficiency of cavitation process on the surface. Practical recommendations for testing of cavitation erosion of metals and protective coatings in abnormal conditions are given.