Abstract：Al2O3 ceramic coating was prepared on the surface of 45 steel substrate by thermo-chemical reaction. The properties of the coating were tested, and the influences of La2O3 on the microstructure and performance of the coating were studied. The conclusions are as follows: La2O3 additives can improve the microstructure and enhance the hardness of the coating; The coating's macroscopic quality is better if the curing temperature is 900 ℃, La2O3 can promote the aggregates to carry on the thermo-chemical reaction to produce the ceramics, at the same time MgFeZr3O4 and MgSiO3 are produced; The ceramic coating with rare earth oxides accounted for 1.19% has the excellent property with good quality of coating appearance, dense tissue and acid resistance, the metallurgical bonding between coating and substrate becomes more obvious.
Key words：thermo-chemical reaction; ceramic coating; rare earth; metallurgical bonding; corrosion resistance
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