**6. Nickel composite/nanocomposite coatings and their properties**

Nickel composite coatings have been developed to withstand challenging and aggressive conditions during service. These coatings exhibit excellent corrosion resistance, tribological properties, and thermal stability. There are several types of nickel base matrix composite coatings that have been developed over the past few years. These include Ni, Ni–P, Ni–B, Ni– W, and Ni–Co matrix composites. In this topic, the structural and functional properties of these coatings will be discussed.
