Preparation of Ni-B amorphous alloy films by electrodeposition using a rotating electrode and their structural changes

Electrodeposition of Ni-B group alloys was conducted using a rotary electrode. The changes in the amount of codeposited B and in the hydrogen content that arise from changes in plating conditions, and the resulting structural chnages in the films were examined. The following results were obtained: 1. The films prepared using a cylindrical rotating electrode contain a larger amount of codeposited B compared to those prepared in a static bath. 2. When the Ni-B amorphous alloy with a B content exceeding 25 at % is prepared using a rotary electrode, the film structure after heat treatment corresponds to the structures of the intermetallic compounds Ni3B and Ni2B in the thermal equilibrium diagram. 3. Although the hydrogen content of Ni-B alloy films are influenced by the current density, they correlate most strongly with the amount of codeposited B.