| dc.description.abstract | In this study, the cobalt-iron-nickel (CoFeNi) ternary alloy was fabricated by microanode guided electroplating (MAGE). In the electroplating, the experimental parameters of cobalt sulfate concentration (0.040 ~ 0.100 M), nickel sulfate concentration (0.30 ~ 0.60 M), and pH value (2.3 ~ 4.3) have been studied. The optimum parameter of applied voltage, the gap between microanode and cathode, the concentration of metal ions, and pH value of bath had been investigated, and then the optimal parameters were applied for producing 3D micro-helical alloy.
The surface morphology, mechanical properties, corrosion resistance, and magnetic properties of the CoFeNi ternary alloy microcolumns were analyzed by the FE-SEM, Nano-indentor, potentiostat, and vibrating sample magnetometer (VSM).
The results showed that the lowest saturation induction intensity reached 1.9 T and the outstanding hardness was 6.46 GPa as the concentration of cobalt sulfate at 0.10 M, nickel sulfate at 0.30 M, and the pH at 3.3. The corrosion resistance is 386 Ohm, and the corrosion current density was 30.7 μA/cm2. When the pH at 3.3, the electroplating rate was increased obviously. Therefore, this condition is more suitable for plating the CoFeNi micro-helical structure.
When electroplating a micro-helical, the experimental parameters are process parameters (repetition times 2, 3, 4) and changing the angle of resolution (30, 50 ). The FE-SEM was used to observe the surface morphology and the length of the microhelices. The results showed that when the electroplating angle was increased, the increment of the pitch of the helix will decrease. In addition, the length of the microhelix will increase due to the increase of the repetition time.
Keywords: Microanode guided electroplating, Cobalt-iron-Nickel alloy, magnetic property.
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