발간논문

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Vol.38, No.8, 1069 ~ 1075, 2000
Title
Characteristics of Corrosion and Microstructures of the Duplex Surface Treated Ductile Cast Iron
정봉용Bong Yong Jeong,김명호Myung Ho Kim
Abstract
Ductile cast iron was treated with the so-called duplex surface treatment process, which is a combined plasma nitriding and oxidation process. The surface and cross-sectional microstructures and corrosion characteristics were analyzed. Potentiodynamic polarization curves were obtained at room temperature from the samples immersed in 3% NaCl solution. In case of the oxidation after nitriding, oxide layer(double layers of Fe₂O₃ and Fe₃O₄was found to be formed on the top of the compound layer(γ`- Fe₄N). The value of the measured parameter Ra(roughness average) of plasma nitrided sample was higher than that of plasma oxidation treated sample. The untreated sample showed typical graphitic corrosion, and the plasma treatment was found to increase the corrosion resistance.
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