Study On Electroless Co-Ni-B Alloy Coatings With Rare Earth Elements Under Ultrasonic Waves

The process, structure and properties of the electroless Co-Ni-B alloy coatings with rare earth elements under ultrasonic waves were studied in this paper. The Co-Ni-B-RE alloy coatings were prepared. The deposition rates in various processing parameters were measured. The results showed that: the deposition rate of Co-Ni-B-RE increased by nearly 30 percent under ultrasonic waves, and the main reason for the deposition rate increment was ultrasonic cavitation. And the stability of the solution decreased and self-decomposition of the solution occurred. As a result, the deposition rate decreased swiftly. The rare earth elements, which co-deposited with cobalt-based soft magnetic alloy and improved the solution technological properties as well as the alloy functional characteristics effectively, were added into the solution. The co-deposition of rare earth elements and cobalt-based alloy was realized because of a positive shift of rare earth metal deposition potentials due to effects of organic ligands coordination and underpotential reduction of transition metals (inducement mechanism). Rare earth elements enhanced deposition rate of the alloy, solution stability, rest potential, and decreased the polarization. The structure of the alloy was also improved. Besides, the microhardness, saturation magnetization intensity, maximum permeability of the alloy coating were increased, and the coercivity was reduced. The involvement of ultrasonic wave promoted reducing adsorption of metal ions, which increased deposition rate of the alloy in the alloy, and improved the structure of the alloy as well as its magnetic properties. The formation disciplinarian, influencing factors and technical conditions of the chemical deposition rare earth cobalt-based soft magnetic film with excellent wear resistance and soft magnetic characteristics were oberserved. The credible experimental data and practical process were supplied for industrial application of chemical deposition rare earth cobalt-based soft magnetic film. The theoretical foundation for further research and development of other electro-deposition rare earth alloy demanding special properties was established.