Effects of Mn addition on the magnetic property and corrosion resistance of bulk amorphous steels

We aim to obtain bulk amorphous steels (BASs) with low magnetic permeability and high corrosion resistance by designing the compositions of (Fe44Cr10Mo12.5Mn11C15B6Y1.5)100−xMnx (x = 0, 2, 4, 8). The vibrating sample magnetometer (VSM) tests show that the magnetization of the BASs exhibits linear relationship to applied magnetic field, indicating the BASs are paramagnetic at room temperature. It is measured that by increasing Mn content from x = 0 to 8, the magnetic permeability can be decreased from 1.0036 to 1.0025. The potentiodynamic polarization experiments show that the BASs have a high corrosion resistance in 3.5% NaCl and 1.0 mol/L HCl solutions. Increasing Mn content can improve corrosion resistance of the BASs in 1.0 mol/L HCl solution to a large degree, while it does not take much effect in 3.5% NaCl solution.