Structural, electrochemical and mechanical studies of ultrasonic irradiation enhanced electroplating Ni coating

Abstract

Purpose

Ni coating was electroplated on carbon steel substrate to protect carbon steel.

Design/methodology/approach

During electroplating, the ultrasonic irradiation (UI) (1 kHz) action was in situ used with different frequency. The influence of UI on the microstructure, mechanical and electrochemical performance of the coating was studied with scanning electron microscopy, X-ray diffraction, microhardness measurement, polarization curves and electrochemical impedance spectroscopy.

Findings

The results show that comparing that without UI imposition, UI during electroplating can refine the coating grain and decrease the micro-pores in the coating, resulting in improvement of the coating corrosion and hardness.

Originality/value

The imposition of UI action during electroplating Ni coating can remove intrinsic pores in the coating and compact the coating. The potential bimetallic cell between substrate and plating layer can be insulated to enhance the corrosion resistance of Ni coating. The imposition of UI action during electroplating Ni coating can refine Ni coating grain size and improve the coating haredness.

Citation

Ban, C., Zhu, S., Ma, J., Wang, F., Jia, Z. and Wang, J. (2018), "Structural, electrochemical and mechanical studies of ultrasonic irradiation enhanced electroplating Ni coating", Anti-Corrosion Methods and Materials, Vol. 65 No. 4, pp. 333-339. https://doi.org/10.1108/ACMM-04-2017-1789