100 / 2024-10-07 14:02:17

Effect of Si content on microstructure and corrosion resistance of FeCr18Six alloys

FeCr18Six alloys, Si content, microstructure, corrosion protection.

FeCr₁₈Si_x alloys with different Si contents (10 at.%,15 at.%,20 at.%,25 at.%) were prepared by arc furnace melting. The effects of Si content on the microstructure and corrosion resistance of FeCr₁₈Si_x alloys were systematically studied by means of XRD and XPS. The results show that the four FeCr₁₈Si_x alloys are all composed of Fe₃Si single-phase structure, and the increase of Si content can refine the grains and increase the hardness of the alloys. The increase of Si content promotes the formation of SiO₂ oxide film on the alloy surface under 10% HCl, effectively prevents the bidirectional diffusion of O^2-/Cr³⁺ in the Cr₂O₃ oxide film, and solves the problem of corrosion pits on the surface of the alloy after corrosion. The corrosion resistance of FeCr₁₈Si_x alloy soaked in 10%HCl for 168h is gradually enhanced with the increase of Si content, and the corrosion resistance of FeCr₁₈Si₂₅ alloy is 40 times that of 2Cr13 alloy.