Cobalt-Nickel-Phosphorus (Co-Ni-P) coatings were electrodeposited in emulsified supercritical carbon dioxide bath and subsequently annealed at 200 ℃ to 600 ℃ for 1 h.Effects of annealing temperature on the morphology,phase structure,microhardness,tribological properties and electrochemical corrosion behaviors of the Co-Ni-P coatings were evaluated.Results show that the Co-Ni-P coatings display an amorphous structure and the transition from amorphous to nanocrystalline structure occurs after the Co-Ni-P coatings are annealed at 400 ℃.Microhardness of the Co-Ni-P coatings first increases and then decreases with the increase of annealing temperature,and the maximum microhardness of 780 HV is obtained at 400 ℃.The Co-Ni-P coatings,regardless of heat treatment or not,display an average friction coefficient of about 0.12.However,the wear resistance and electrochemical corrosion behaviors are greatly affected by the annealing temperature.The wear rate and corrosion rate of Co-Ni-P coatings first decrease and then increase with the increasing of the annealing temperature.The lowest wear rate and corrosion rate are achieved by annealing the Co-Ni-P coatings at 300 ℃ and 400 ℃,respectively.