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Vol.40, No.12, 1303 ~ 1309, 2002
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| Title |
| Electronic, Magnetic & Optical Materials : Magnetic Properties and Corrosion Resistance of (FeNiCr) Amorphous Alloys for Filtering Media Use |
| 임종만 J. W. Lim , 남궁정 J. Nam Kung , 김문철 M. C. Kim , 노태환 T. H. Noh |
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| Abstract |
| With the object of developing a ferromagnetic filtering media used in electromagnetic filtering process of iron & steel industries, addition effects of Cr and Ni on magnetic properties and corrosion resistance for Fe_80P_20 amorphous ribbon alloy have been investigated. In (FeCr)_80P_20 ternary alloys, the soft magnetic properties and corrosion resistance were largely enhanced upon Cr addition of about 5 at%, although considerable decrease in saturation magnetization occurred. However the corrosion rate was thought to be still high for practical use. If the Fe was substituted by some Ni to form a quarternary Fe-Ni-Cr-P alloys, decrease of the saturation magnetization was strongly suppressed. Moreover the soft magnetic properties and corrosion resistance were improved to a great extent as compared to Fe_75Cr_5P_20 amorphous alloy. For Fe_75Ni_5Cr_5P_20 amorphous alloy, the values of B_10, M_s and H_c were 6.9 kG, 110 emu/g and 0.24 Oe, respectively. The corrosion rate was measured to be very low(less than 0.2 ㎜/ yr) in 5 wt% HCl solution(room temperature) and 2 wt% NaOH solution(60℃). The good soft magnetic properties and corrosion resistance of Fe_75Ni_5Cr_5P_20 amorphous alloy were attributed to the decrease in saturation magnetostriction and more active formation of CrO_X(OH)_(3-2x)·nH_2O passive films by the combined addition of Ni and Cr. |
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| Key Words |
| Amorphous alloys, Filtering media, Magnetic properties, Corrosion resistance |
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