Anodic Behavior of Each Component in a Few Nickel-Metal Composites and Effect of Added Metal in Composites on Electrolytic Production of NF3

Abstract

The nickel-metal composites such as Ni-Co, Ni-Mn, Ni-Ag, and Ni-Si were prepared by Hot Isostatic Pressing (HIP). The ratios of each metal in the mixture were 5 and 10 mol%. These materials were employed as the anode for electrolytic production of NF3. The current efficiencies for NF3 formation on the Ni-Co, the Ni-Mn, the Ni-Ag, and the Ni-Si composite anodes were 42 – 38%, 52 – 40%, 52 – 47%, and 41%, respectively, and were small compared with those on the Ni sheet and the HIPed Ni anodes. On the other hand, the current losses caused by anodic dissolution (Qa/Qt) of the Ni-Co, the Ni-Mn, the Ni-Ag, and the Ni-Si composites were 7.95 – 4.42%, 6.40 – 7.02%, 5.60 – 6.30%, and 0.18%, respectively. Those of the Ni-Co, the Ni-Mn, and the Ni-Ag were large compared with those of the Ni anodes, whereas that of the Ni-Si composite was small compared with those of the Ni anodes. Therefore, it is concluded that only Si may prevent effectively the Ni-based composite from anodic dissolution.