ELECTRODEPOSITION OF NI-MO ALLOYS WITH PULSE REVERSE POTENTIALS

With the aim of improving the protective properties of Ni-Mo alloy lay ers, pulse reverse electrodeposition has been investigated. The anodic pulses were applied in the potential range where hydrogen desorption and oxidation occur. The alloy composition was shown to depend on the pulse parameters, especially on the anodic pulse duration. For long an odic pulses a preferential dissolution of molybdenum in the electrodep osited alloy occurs, while bulk Ni-Mo alloys do not undergo any dissol ution. For anodic pulses longer than a certain threshold the electrocr ystallization process becomes blocked. The morphology and microstructu re of the layers are mainly determined by the molybdenum content rathe r than by the pulse parameters.