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논문 기본 정보

자료유형
학술저널
저자정보
이인섭 (동의대학교) 김호준 (동의대학교)
저널정보
한국표면공학회 한국표면공학회지 한국표면공학회지 제51권 제1호
발행연도
2018.2
수록면
54 - 61 (8page)

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이 논문의 연구 히스토리 (22)

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Plasma Nitriding treatment was performed on STS 204Cu stainless steel samples at a temperature of 400℃ for 15 hours with varying N2 content as 10%, 15% and 25%. Regardless of the content of N₂, S-Phase which is a hardened layer of Nitrogen (N) supersaturated phase, was formed in the surface of plasma treated samples. When N₂ content was 25%, the thickness of the hardened layer reached up to about 7 μm and the surface hardness reached a value of 560 Hv0.05, which is about 2.5 times higher than that of untreated sample (as received 220 Hv0.05). From potentiodynamic polarization test, it was observed that compared to as received sample, the corrosion potential and the corrosion current density of the plasma treated samples were decreased regardless of the N₂ content, but the corrosion resistance was not increased much due to the precipitation of Cr₂N. On the other hand, pitting potential of the samples treated with 10% and 15% N₂ was higher than that of as received sample, however, the samples treated with 25% exhibited a lower pitting potential. Therefore, 10% N₂ content was selected as optimum plasma nitriding condition and to further increase both the thickness and surface hardness and the corrosion resistance of the hardened layer, different CH₄ content such as 1%, 3% and 5% was introduced into the plasma nitriding atmosphere. With 1% CH₄, the thickness of the hardened layer reached up to about 11 μm and the surface hardness was measured as about 620 Hv0.05, which is about 2.8 times that of as received sample. And the corrosion resistance of the plasma treated sample by using 1% CH4 was improved significantly due to much higher pitting potential, and lower corrosion current density. When the CH₄ content was more than 1%, the thickness and surface hardness of the hardened layer decreased slightly and the corrosion resistance also decreased.

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Abstract
1. 서론
2. 실험방법
3. 결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2018-581-001822030