Objective To improve the hardness and corrosion resistance of 2205 duplex steel. Methods Solid powder embedding boronizing was conducted for 2205 duplex steel and kept warm for 5 h in muffle furnace at 830 ℃, 860 ℃, 890 ℃ respectively; and cooled to room temperature with the furnace after insulation at 860 ℃ for 3 h, 5 h, 7 h. The cross-section morphology of the boriding layer and the thickness of the boriding layer were analyzed by metallography and SEM. The surface hardness of boriding layer was tested by Vickers hardness tester, the hardness at different depth of boriding layer was tested by Nanoindentation tester, the phase structure of boriding layer was analyzed by X-ray diffraction, and the binding force of the boriding layer and substrate was evaluated. Comparative corrosion resistance tests of the boriding layer were conducted in different mediums. Results The boriding layer was firmly bonded to the substrate as the dentate structure, and the damage grade was 1. The boriding layer was mainly composed of Fe2 B. When the temperature was 860 ℃ , the thickness and hardness of the boriding layer gradually increased with time. When the time was 5 h, the thickness of the boriding layer gradually increased with temperature, but the hardness of the boriding layer increased at first and decreased later with increasing temperature. The corrosion resistance of the sample after the boriding treatment increased in 10% HCl and 10% NaCl but decreased in 10% H2 SO4 , 10% NaOH, 10% HNO3 . Conclusion Solid powder embedding boronizing process improved the surface microstructure and properties of 2205 duplex steel, and it could effectively improve the hardness and corrosion resistance of 2205 duplex steel.