한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제43권4호
  • /
  • Pages.205-210
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  • 2010
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  • 1225-8024(pISSN)
  • /
  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
권호 표지
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저탄소강 용접열영향부의 NaCl, H2S 수용액에서 생성되는 부식스케일 분석

Analysis on the Scales formed on the Heat Affected Zone of Low Carbon Steel Weld in NaCl and H2S Water Solutions

  • 김민정 (성균관대학교 신소재공학과) ;
  • 배동호 (성균관대학교 기계공학과) ;
  • 이동복 (성균관대학교 신소재공학과)
  • Kim, Min-Jung (School of Advanced Materials Science & Engineering, Sungkyunkwan University) ;
  • Bae, Dong-Ho (School of Mechanical Engineering, Sungkyunkwan University) ;
  • Lee, Dong-Bok (School of Advanced Materials Science & Engineering, Sungkyunkwan University)
  • 투고 : 2010.06.28
  • 심사 : 2010.08.30
  • 발행 : 2010.08.31
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초록

The A106 Gr B low carbon steel, which was used in the electric power plants and heavy chemical plants, was welded by multi-pass arc welding. The heat affected zone (HAZ) formed by welding was corroded in acid chloride solution, or in saturated $H_2S$ containing acid chloride solution, or in saturated $H_2S$ containing acid chloride solution under applied current. In this order of corrosion solution, the rate of corrosion increased, because $H_2S$ accelerated the iron dissolution, hydrogen evolution, and the formation of nonprotective FeS, whereas the applied current accelerated the electrochemical reaction. The scales formed in acid chloride solution consisted primarily of $Fe_3O_4$, while those formed in $H_2S$ containing acid chloride solution consisted primarily of $Fe_3O_4$ and FeS.

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