Abstract
The multilayered Ni coatings were successfully obtained by introducing the periodic ultrasonic wave into the ordinary electroplating process. The bidirectional bend method is proposed to assess the adhesion performance of electroplated Ni coatings to the substrate. The results show that the multilayered Ni coatings show much better adhesion performance than that of the ordinary Ni coatings. The application of ultrasonic causes a strong modification in the growth orientation of Ni crystallites in the coating, to promote the growth of nickel layers in the manner parallel to the substrate surface, namely (111) growth orientation.
Acknowledgments
This work is financially supported by National High Technology Research and Development Program of China (No. 2009AA03Z103).