Fe-based amorphous composite coatings were prepared on the surface of 45 steel substrate by high power fiber laser and supersonic plasma spraying equipment separately. The microstructure

microhardness and corrosion resistance of the cladding layer were analyzed by the scanning electron microscopy

microhardness tester and X-ray diffractometer. The results show that the laser cladding coating is well formed. No obvious defects

such as pores and cracks

were observed in the cladding layer. A good metallurgical bond is formed between the cladding layer and the substrate;the microstructure of cladding layer is columnar crystal

dendritic and amorphous coexisting structure. The coating by supersonic plasma spray has a high amorphous content. The mechanical bond between cladding layer and substrate is relatively weak. The defects

such as pores and microcracks

were observed in the coating. The microstructure of the laser cladding layer is dense

and Fe-Cr

（Cr Fe）

7

C

3

compound is precipitated

which makes the hardness and corrosion resistance of the laser cladding coating much higher than that of the supersonic plasma spray coating.