Cr元素对Fe基块体非晶合金玻璃形成能力及耐腐蚀性能的影响

Fe_68.4-xCo_7.6Si₇B₁₀P₅C₂Cr_x (x=0, 1, 2, 3) bulk amorphous alloys were prepared using micro alloying. The ribbon and rod samples were prepared by single-roller melt spinning and copper mold casting, respectively. The thermodynamic properties and glass forming ability of the bulk amorphous alloys were characterized by XRD, DSC and DTA. Further, the corrosion behaviors of the amorphous alloys were tested in H₂SO₄ solution using a potentiodynamic polarization method. The results show that the glass forming ability of the amorphous alloys increases with the addition of Cr element. When the Cr content is 2 at%, the largest supercooled liquid phase region is ΔT_x=59 K for the Fe_68.4-xCo_7.6Si₇B₁₀P₅C₂Cr_x (x=0, 1, 2, 3) bulk amorphous alloys, and a rod-like amorphous alloy sample is obtained with 5 mm in diameter. Moreover, in the 1 mol/L H₂SO₄ solution, a protective layer rich in Cr elements forms on the surface of the alloy because of the addition of Cr element, which can effectively prevent the further corrosion of the material. Therefore, the corrosion resistance improves significantly.