An insight into the role of boron content and heat treatment on the corrosion behaviour of Ni–B coatings
摘要
In the present study, the influence of B content (0–4.69 at%) and heat treatment temperature (100–700 °C) on the corrosion behaviour of electrodeposited Ni–B coatings has been investigated using electrochemical polarisation and impedance spectroscopy. The results indicate that there exists a critical boron content of ~ 0.8 at% resulting in the best corrosion resistance irrespective of heat treatment temperature. These results were rationalised based on the characteristics of the oxide film (from depth-wise XPS analysis) and its semiconducting properties (from Mott–Schottky analysis). The role of grain boundaries and triple junctions on the corrosion behaviour has also been investigated.
Graphical abstract