Abstract

The electrochemical codeposition is a process by which particle-dispersed metal-matrix coating is electroplated from a plating bath suspended with particles. The codeposition can be applied to produce an intermetallic-contained layer requiring subsequent heat treatment for intermetallic formation. In this research, the codeposition of a Ti-dispersed Ni-matrix layer is of interest; dispersed-Ti particles can potentially enhance the mechanical and chemical properties of the Ni-matrix coating. Moreover, with a proper composition control and heat treatment, the Ni-Ti layer can potentially transform into NiTi alloy. To enhance the coating uniformity and Ti composition, the pulsed current is applied to codeposit Ni-Ti layers. The studied parameters include the duty cycle and frequency of the pulsed current. The Ni-Ti layers are analyzed by X-Ray fluorescent and scanning electron microscope. The results show that the pulse form improves the coatings’ uniformity. The duty cycle significantly affects the coatings’ Ti contents, while the frequency exhibits minimal effect.

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