Traditional iron and steel materials are difficult to meet the harsh corrosion environment of deep well mining,so it is urgent to develop new materials with good corrosion resistance.SiC ceramic has excellent corrosion resistance.Therefore,the preparation and corrosion resistance of SiC based composites were discussed.Three-dimensional network structure SiC ceramics were prepared by organic foam impregnation method using SiC,Al2O3,SiO2 as raw materials,and three-dimensional network structure SiC-Fe composites were prepared by casting process.The microstructure and phase of SiC-Fe composites were analyzed by scanning electron microscope and X-ray diffractometer.The corrosion resistance of SiC-Fe composites was characterized by electrochemical test and immersion test,and its anti-corrosion mechanism was analyzed.The results show that there is no element diffusion between SiC ceramic reinforcement and high-chromium cast iron matrix in SiC-Fe composites,and the interface bonding mode is mechanical bonding.The main phases in the matrix are austenite and carbides,the ceramic reinforcement is mainly composed of hexagonal SiC and Al2O3.The addition of SiC ceramic reinforcement reduces the corrosion current of high-chromium cast iron from 4.189×10-3 A/cm2 to 3.353×10-3 A/cm2,〖JP2〗increases charge transfer resistance from 7.309 Ω·cm2 to 11.881 Ω·cm2,and reduces the capacitance values from 1.994×〖JP〗10-4F/cm2 to 1.974×10-5 F/cm2,which improves the overall corrosion resistance.The immersion test shows that the corrosion of SiC-Fe composites mainly occurs in the high-chromium cast iron matrix,and the interface and SiC ceramic reinforcement are not prone to corrosion.Compared with high-chromium cast iron materials,the pitting corrosion of SiC-Fe composites occurs later and the corrosion degree is relatively light.The research results provide an important theoretical basis for the application of composite materials in deep coal mining equipment.