Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Cause of Corrosion and Evaluation of Material Corrosion Resistance on Underground Heat Transport Facilities Connected to Manhole

맨홀과 연결된 지하 열수송설비의 부식 원인 및 재질 내식성 평가

  • Song, M.J. (Department of Materials Science and Engineering, Chungnam National University) ;
  • Choi, G. (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, W.C. (R&D Institute, Korea District Heating Corp.) ;
  • Lee, S.Y. (Department of Materials Science and Engineering, Chungnam National University)
  • 송민지 (충남대학교 신소재공학과) ;
  • 최가현 (충남대학교 신소재공학과) ;
  • 김우철 (한국지역난방공사 미래개발원) ;
  • 이수열 (충남대학교 신소재공학과)
  • Received : 2022.07.03
  • Accepted : 2022.07.22
  • Published : 2022.07.30
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Abstract

Manholes and underground spaces are installed to manage the buried heat transport pipes of the district heating system, and the corrosion damage of the equipment placed in this space often occurs. The purpose of this work is to identify locations with a high risk of corrosion damage in the air vent and to establish preventive measures based on precise analysis via sampling of heat transport pipes and air vents that have been used for about 30 years. The residual thickness of the air vent decreased significantly by reaching ~1.1 mm in thickness, and locations of 60~70 mm away from a transport pipe were the most vulnerable to corrosion. The energy dispersive X-ray spectroscopy (EDS) analysis was performed in the corroded oxides, and it was found that chloride ion was contained in the corrosion products. Anodic polarization tests were carried out on the air vent materials (SPPS250, SS304) with varying the amounts of chloride ions at two different temperatures (RT, 80℃). The higher concentration of chloride ions and temperature are, the lower corrosion resistances of both alloys are.

Keywords

Acknowledgement

본 연구는 한국지역난방공사의 지원을 받아 수행되었습니다.

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