With the increase of ultrasonic treatment time, the surface roughness gradually decreases, and the maximum decrease of pt value and average surface height is 10% and 20%
With the increase of ultrasonic processing time, the surface roughness decreases gradually, and the maximum reduction of pt value and average surface height is 10% and 20%
With the increase of ultrasonic treatment time, the surface roughness decreases gradually, and the maximum reduction of Pt value and surface average height is 10% and 20%<BR>