Abstract
In order to study the effect of ultrasonic waves on electrodeposition of hard chromium, experiments are carried out by using two kinds of ultrasonic application. One consists of inducing ultrasonic vibrations of 28.5 kc/s in the cathode test-piece and the other radiating respective ultrasonic waves of 28.5, 400, 600 and 800 kc/s perpendicular to the cathode surface. In the former experiment, 27% increase in the rate of deposition is obtained by making use of ultrasonic power of 75 watts, whilst the increase is less marked with power of 150 and 300 watts. In the latter experiment, the maximum increase of 35% in the rate of deposition appears at 800 kc/s and 230 watts, while an increase of 410 % is obtained at other frequencies. Hardness is raised by 25% at 800 kc/s and fourfold resistance to wear is obtainable at 400 kc/s and 400 watts. The effect of ultrasonic waves on porosity is not evident but the waves make the crystal structure of deposit finer. An energetic study of quantitative relationship existing in both ultrasonic waves and plating conditions will lead to make the quality of deposited chromium improve.
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