Abstract
Corrosion of NiP and CoP alloys in oxygen was investigated in the temperature range 350–800 °C on aselectrodeposited films and after annealing treatments. For as-electrodeposited films, both alloys oxidize by diffusion and the scales consist of an inner region rich in phosphorus and an outer region of oxides (NiO or Co 3O 4). Good corrosion resistance achieved after extended heating above 600 °C in vacuum, very well marked for NiP alloys, is explained in terms of crystallization and grain coarsening. This indicates that at these high annealing temperatures the crystals of phosphides formed a continuous layer with embedded nickel crystals rendering the alloy extremely resistant to oxygen penetration.
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