Effect of Cr Element on the Forming Ability and Corrosion Properties of Fe-based Bulk Amorphous Alloys

Abstract:

Using micro alloy technology, Fe_68.4-xCo_7.6Si₇B₁₀P₅C₂Cr_x (x=0, 1, 2, 3) bulk amorphous alloys were prepared. The ribbon and rod samples were prepared by single-roller melt spinning and copper mold casting, respectively. The thermodynamic properties and forming ability of the bulk amorphous alloys were characterized by using XRD, DSC and DTA. Further, the corrosion behaviors of the amorphous alloys were tested in H₂SO₄ solution by using potentiodynamic polarization method. The experimental results showed that the forming ability of the amorphous alloys increased with the addition of Cr element. Moreover, in the 1N H₂SO₄ solution, a protective layer rich in Cr elements formed on the surfacr of the alloy because of the addition of Cr element, which can effectively prevent the further corrosion of the material. Therefore, the corrosion resistance was improved significantly