Ni-Al nanocomposite coating electrodeposited from deep eutectic solvent

Abstract Ni Al nanocomposite coatings are fabricated by pulsed electrodeposition in choline chloride-ethylene glycol (ChCl-EG) deep eutectic solvent (DES) containing Nickel chloride and Al nanoparticles. The dispersion stability of Al nanoparticles in the DES-based colloidal electrolyte is investigated. Meanwhile, the deposition behavior and nucleation growth mode of Ni in the colloidal electrolyte are studied. Moreover, the influences of the Al nanoparticles loading in the DES on the content and distribution of Ni Al coating is investigated. When the concentration of Al nanoparticles in the DES is 32 g L−1, the Al content in the composite coating could reach as high as 19.39 wt%. The Ni Al nanocomposite coating exhibits superior oxidation resistance to high temperature than the pure Ni coating. Moreover, after high-temperature calcination treatment of the Ni Al nanocomposite coating, the obtained Ni-Al + HT coating could form NiAl intermetallic compounds and metal oxides, which performed superior mechanical hardness and anti-corrosion property.