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Vol.42, No.12, 998 ~ 1005, 2004
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| Title |
| Effects of Alloying Elements on the Corrosion Property of the Weathering Steel for Seaside Area (2) -Ni, W and Mo Effects- |
| 정환교 Hwan Gyo Jung , 유장용 Jang Yong Yoo , 김규영 Kyoo Young Kim |
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| Abstract |
| The objective of this study is to understand the effect of W and Mo on the corrosion property of the Ca-modified weathering steel and to determine the optimum chemical composition to maximize the corrosion resistance at seaside corrosion environment. The effects of various alloying elements on the weathering steel were evaluated through a series of electrochemical test and analysis of the corrosion product formed on the steel surface. The polarization resistance of Ca-modified weathering steel can be increased by the addition of Ni, W and Mo, thus the corrosion resistance of Ca^(-)modified weathering steel containing Ni, Mo and W is increased at the initial stage of corrosion in a solution with high NaCl concentration. From the measurement on the permeability of Cl^(-) ions, the rust membranes formed from weathering steel of thin plate shape showed the anion-selectivity and the addition of various alloying elements (Ni, W and Mo) contributed to lower the permeability of Cl^(-) ions toward rust membranes. Particularly, Mo and W are more effective than Ni to suppress the permeation of Cl^(-) ions. It has an industrial significance for alloy design of the weathering steel since design of a lower cost weathering steel with higher corrosion resistance can be possible with addition of Mo or W instead of increasing the high cost Ni content to 2% or even higher. (Received May 19, 2004) |
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| Key Words |
| Ca-modified weathering steel, Corrosion resistance, α-FeOOH, Permeability of Cl(-) ion |
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