Characteristics of cavitation-induced sonoluminescence under conditions ofcathodic protection

In this study, cavitation-induced sonoluminescence under conditions of cath odic protection was measured and examined in three percent sodium sulfate s olution using an electrostrictive vibratory apparatus. It was found that th e relative intensity of sonoluminescence increases as the cathodic current becomes larger. This is because the hydrogen gas bubbles which evolve can a lso give off sonoluminescence in the same way as cavitation bubble. This fa ct suggests that cavitation accompanied by an electrolytic reaction can res ult in more intense sonoluminescence.