Corrosion Behavior of 304 Stainless Steel in High Temperature Boron-containing Vapor
The corrosion behavior of 304 stainless steel in boron-containing water vapor at 300℃ was studied.The microstructure and composition distribution of the surface of the sample after corrosion in boron-containing water vapor were analyzed by scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and X-ray diffraction(XRD).The results showed that the mass fraction of oxygen on the surface of the sample in the vapor phase was significantly higher than that in the liquid phase,and the oxide film formed on the surface of the sample in the vapor phase was a double-layer structure.The upper layer was a Fe2O3 and Fe3O4 particle layer,and the lower layer was a dense chromium-containing spinel layer,while there was only a layer of dispersed oxide particles on the surface of the liquid phase sample.When there was an appropriate amount of oxygen in the closed reactor,the corrosion degree of 304 stainless steel in boron-containing water vapor could be significantly reduced.The possible corrosion and anti-corrosion mechanisms were analyzed and discussed.
Boric acidBoron-containing water vaporCorrosionOxide film
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