열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제14권2호
  • /
  • Pages.103-109
  • /
  • 2001
  • /
  • 1225-1070(pISSN)
  • /
  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
권호 표지

플라즈마 산질화처리 조건이 강의 내식성에 미치는 영향

The Characteristics of Corrosion Resistance during Plasma Oxinitrocarburising for Carbon Steel

  • 이구현 (한국기계연구원 표면기술연구부) ;
  • 남기석 (한국기계연구원 표면기술연구부) ;
  • 이상로 (한국기계연구원 표면기술연구부) ;
  • 조효석 (한국기계연구원 표면기술연구부) ;
  • 신평우 (창원대학교 금속재료공학과) ;
  • 박율민 (창원대학교 금속재료공학과)
  • Lee, K.H. (Dept. of Surface Engineering, KIMM) ;
  • Nam, K.S. (Dept. of Surface Engineering, KIMM) ;
  • Lee, S.R. (Dept. of Surface Engineering, KIMM) ;
  • Cho, H.S. (Dept. of Surface Engineering, KIMM) ;
  • Shin, P.W. (Dept. of Material Science and Engineering, Changwon National University) ;
  • Park, Y.M. (Dept. of Material Science and Engineering, Changwon National University)
  • 투고 : 2001.03.12
  • 발행 : 2001.03.31
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초록

Plasma nitrocarburising and post oxidation were performed on SM45C steel using a plasma nitriding unit. Nitrocarburising was carried out with various methane gas compositions with 4 torr gas pressure at $570^{\circ}C$ for 3 hours and post oxidation was carried out with 100% oxygen gas atmosphere with 4 torr at different temperatures for various times. It was found that the compound layer produced by plasma nitrocarburising consisted of predominantly ${\varepsilon}-Fe_{2-3}(N,C)$ and a small proportion of ${\gamma}-Fe_4(N,C)$. With increasing methane content in the gas mixture, ${\varepsilon}$ phase compound layer was favoured. In addition, when the methane content was further increased, cementite was observed in the compound layer. The very thin oxide layer on top of the compound layer was obtained by post oxidation. The formation of Oxide phase was initially started from the magnetite($Fe_3O_4$) and with increasing oxidation time, the oxide phase was increased. With increasing oxidation temperature, oxide phase was increased. However the oxide layer was split from the compound layer at high temperature. Corrosion resistance was slightly influenced by oxidation times and temperatures.

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