The purpose of this paper is to examine the influence of cold spraying parameters on the performance of Fe-based amorphous alloy (FAA) coating. A FeCoCrMoBCY amorphous alloy coating was prepared on a 40Cr substrate by cold-spraying with different gas pressures and temperatures. The results show that the spray temperature has no substantial effect on the amorphous content during deposition. The porosity of the FAA coatings decreases with the increase of the spray parameters. The hardness of the cold sprayed coatings decreases slightly as the spraying parameter decreases. Wear tests show that cold spraying FAA coating can provide excellent wear protection. The high porosity induced by the insufficient deformation of the hard FAA particles leads to an acceleration in corrosion for the substrate. Cold-spraying can be used to fabricate FAA coating with good wear resistance, but sealing is still necessary to guarantee the corrosion resistance since.
The oxidation tests of Ferritic Steel T22 exposed to supercritical water (SCW) at 540–620°C and 25 MPa was performed for up to 1000 h. The oxidation rate increased with increasing exposure temperature and time. Oxide films formed on T22 have a double-layered structure with an outer layer consisting of iron oxide and an inner layer consisting of spinel oxide. Numerous pores on the surface can be observed at the initial oxidation stage while they seemed to heal with increasing exposure time at 620°C. Cracks occurred along grain boundaries in the oxide scale when T22 exposed for 200 h at 620°C. The influence of time and temperature on the oxidation of Ferritic Steel T22 was discussed.
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