Abstract
Effects of ultrasonic radiation on the deposition rate of chemical nickel plating and on the properties of the nickel deposit have been studied. The deposition rate of nickel was increased remarkably by ultrasonic radiation in citrate baths, but no such large increment was obtained in succinate baths. The enhancement of the deposition rate might be attributable to the diffusion controlled process in chemical nickel plating.Ultrasonic radiation also influenced the crystallographic structure and hardness of the nickel deposits, and reduced the P content of the nickel deposits owing to the increased co-deposition of Tl. However, heat-treatment of the nickel deposits resulted in precipitation hardening due to Ni3P formation.The hardness of the deposits decreased with the ultrasonic radiation depending on the P content of the deposits. Changes in the properties of the nickel deposits with ultrasonic radiation was interpreted as a function of the P content of the nickel deposits.
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