论文部分内容阅读
Binary bright Ni–Co alloy films were electrodeposited on titanium in the chloride–sulfate electrolytes.The influences of Co2?concentration, current density, and temperature on the Ni–Co alloy films electrodeposition were investigated. The films were analyzed by scanning electron microscope(SEM), energy dispersive spectroscopy(EDS), and X-ray diffraction(XRD). Cathodic polarization for Ni–Co codeposition was performed on Ti working electrodes. With the increase of Co2?concentration, the Ni content in the films decreases and the current efficiency increases slightly. The Ni content increases with the increase of temperature, while it decreases with the increase of current density to a minimum and then increases. The cathodic reduction peak potential is measured to be-1.34 V. Anomalous deposition is found to occur in the Ni–Co codeposition. The SEM of Ni–Co alloy films shows that hydroxide particles are not present on the surface and fine grain, compact, smooth, and bright Ni–Co alloy films are obtained. The XRD result indicates that the deposited Ni–Co alloy film is Ni-solid solution with a facecentered cubic in structure.
Binary bright Ni-Co alloy films were electrodeposited on titanium in the chloride-sulfate electrolytes. The influences of Co2 concentration, current density, and temperature on the Ni-Co alloy films electrodeposition were investigated. The films were analyzed by scanning electron microscope ( SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). Cathodic polarization for Ni-Co codeposition was performed on Ti working electrodes. With the increase of Co2 concentration, the Ni content in the films decreases and the current efficiency increases slightly. The Ni content increases with the increase of temperature, while it decreases with the increase of current density to a minimum and then increases. The cathodic reduction peak potential is measured to be-1.34 V. Anomalous deposition is found to occur in the Ni-Co codeposition. The SEM of Ni-Co alloy films shows that hydroxide particles are not present on the surface and fine grain, compact, smooth, and bright Ni Co alloy films are obtained. The XRD result indicates that the deposited Ni-Co alloy film is Ni-solid solution with a facecentered cubic in structure.