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In order to improve the high-temperature oxidation and wear resistance of the superheat tubes in waste incinerators, NiCrB coatings were prepared on SA213-T2 steel surface by arc spraying using two types of NiCrB cored wires with different boron contents. Microstructure, high-temperature oxidation behavior and microhardness of the NiCrB coatings were investigated, and compared with the commercial NiCrTi coating. The results show that the NiCrB coatings exhibit dense layered structure with low oxides and porosity about 3%. The microhardness of the NiCrB coatings is obviously higher than that of the NiCrTi coating. Thermo-gravimetric analysis was used to evaluate the high-temperature oxidation behavior of the Ni-based coatings at 800℃ under cyclic oxidation condition. The NiCrB coating with lower boron content exhibits excellent high-temperature oxidation resistance comparing to that of the NiCrTi coating. Due to the compact Cr2O3 film formed on the coating surface, the penetration of oxygen to internal coating is inhibited. © 2017, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.
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