Tribological Characterization of Electroless Nickel Coatings at High Temperatures

Electroless nickel (EN) coatings are widely applicable in industries. Current trends also present enhanced high-temperature performance of EN-based coatings. The high-temperature tribological behaviour is guided by phase transformations and formation of tribo-oxide layers. The present chapter reports high-temperature tribological characterization of EN coatings. The electroless coatings present a globular morphology. The wear surface at high temperatures consists of oxide glaze. At 100 °C, tribological behaviour is controlled by formation of strain-hardened wear debris. Nickel phosphides and nickel borides are formed due to heat accumulation and high flash temperature at the interface. Further, the future scope and possibilities of improvement of wear resistance of the coatings have also been discussed.