Nanocrystalline nickel coating prepared by pulsed electrodeposition combined with ultrasonic agitation

作者：Yang Yanling; Shen Yongfeng^*; Chen Jingeng; Wang Yandong

来源：Acta Metallurgica Sinica, 2007, 43(8): 883-888.

• nickel coating
• pulsed electrodeposition
• ultrasonic
• grain size
• microhardness

Continuous ultrasonic wave was introduced into pulse-electrodeposition, which was used in synthesized nanocrystalline (nc) nickel coatings with a thickness of about 90 pm. The grain sizes of the coatings deposited under different ultrasonic intensities and electrolysis technique parameters were measured by XRD and TEM, and the results show that the variation of grain sizes was dominated by ultrasonic intensities. The typical electrolysis technique parameters were followed as : average current density Was 10 A/dm(2) with a on-time (t(on)) of 0.2 ms and off-time (t(off)) of 0.8 ms, and the electrolyte with pH 4.0 was controlled at a temperature of 50 degrees C. Under above conditions, it was found that the grain sizes of deposited coatings varied with variation of ultrasonic intensity, and the average grain sizes of obtained coating decreased from 45 nm to 24 nm when ultrasonic intensity increased from 0 W to 50 W. However, the grain size of deposited coatings increased to 38 nm when ultrasonic intensity further increased to 70 W. The microhardness (HV) value of deposited coating with an average grain size of 24 nm was found to be 760.

• 出版日期2007-8
• 单位东北大学