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CO2 erosion; Ni-TiN nanocoating; electrodeposition Abstract. Ni-TiN nanocoatings were successfully fabricated by pluse electrodeposition (PED) on the surface of 20 steel. Microstructures of the coatings were investigated by XRD, SEM, and HRTEM. In the CO2 erosion test, both 20 steel and Ni-TiN nanocoatings were evaluated using the autoclave. The XRD and HRTEM results demonstrated that the Ni-TiN nanocoatings were consisted of Ni phase and TiN phase. And the average diameter of Ni grains and TiN particles were approximately 52 nm and 30 nm, respectively. The CO2 erosion experimental results indicated that the Ni-TiN nanocoatings showed better corrosion resistance than 20 steel. And CO2 pressure had great effect on the erosion characteristic of Ni-TiN nanocoatings.