Metallurgically bonded Al2O3 ceramic coating was prepared on steel surface with the combined method of arc spraying and electrolytic plasma processing. The composition and microstructure of the ceramic coating were analyzed by x-ray dif fraction, scanning electron microscony and EDS. The corrosion resistance and wea r resistance of the ceramic coating were measured. The results show that the cer amic coating is compact and mainly composed of α-Al2O3, γ-Al2O3, θ-Al2O3 and a little of a morphous phase. The duplex coating shows favorable corrosion resistance and wear resistance properties.