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Vol.52, No.2, 129 ~ 136, 2014
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| Title |
| Effects of Cr Content in Amorphous Ribbons (Fe0.79C0.11Si0.02B0.08)100-xCrx on Their Corrosion Resistance |
| 김문정 Mun Jeong Kim , 김상원 Sang Won Kim , 윤상훈 Sang Hoon Yoon , 이승훈 Seong Hoon Yi |
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| Abstract |
| To development of anti-corrosive Fe-alloys with a high carbon content, we designed an amorphous alloy in the alloy system Fe-C-Si-B-Cr. In the (Fe0.79C0.11Si0.02B0.08)100-xCrx (x = 2, 4, 6, 8 at%) ribbon with a thickness of less than 25 μm, an amorphous phase was formed without Cr carbide formation. As the Cr content increased, the corrosion resistance in the 3.5 wt% NaCl and 1 N H2SO4 solutions monotonically increased, exhibiting an abrupt increase when the Cr content was higher than 6 at% (for the NaCl solution) and 8 at% (for the H2SO4 solution). From the corrosion test results for the fully amorphous and partially crystallized ribbons with high Cr content (i.e., 8 at%), we demonstrate that, even with a high Cr content, the homogeneous spatial distribution of Cr and the absence of microstructural defects in the ribbon are critical to significantly enhance the corrosion resistance of the high Cr ribbon. †(Received April 15, 2013) |
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| Key Words |
| amorphous materials, solidification, corrosion, scanning electron microscopy, immersion test |
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