Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Corrosion Failure Analysis of Flow Plate in Plate Heat Exchanger

판형 열교환기 전열판의 부식 파손 분석

  • Song, Min Ji (Department of Materials Science and Engineering, Chungnam National University) ;
  • Choi, Gahyun (Department of Materials Science and Engineering, Chungnam National University) ;
  • Chae, Hobyung (Department of Materials Science and Engineering, Chungnam National University) ;
  • Kim, Woo Cheol (R&D Institute, Korea District Heating Corp.) ;
  • Kim, Heesan (Department of Materials Science and Engineering, Hongik University) ;
  • Kim, Jung-Gu (School of Advanced Materials Science and Engineering, Sungkyunkwan University) ;
  • Lee, Soo Yeol (Department of Materials Science and Engineering, Chungnam National University)
  • 송민지 (충남대학교신소재공학과) ;
  • 최가현 (충남대학교신소재공학과) ;
  • 채호병 (충남대학교신소재공학과) ;
  • 김우철 (한국지역난방공사미래개발원) ;
  • 김희산 (홍익대학교 재료공학과) ;
  • 김정구 (성균관대학교신소재공학부) ;
  • 이수열 (충남대학교신소재공학과)
  • Received : 2021.06.18
  • Accepted : 2021.06.29
  • Published : 2021.08.31
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Abstract

Corrosion failure analysis of the flow plate, which is one of the accessories of the plate heat exchanger in a district heating system, was performed. The flow plate is made of 316 stainless steel, and water at different temperatures in the flow plate exchanges heat in a non-contact manner. The flow plate samples in which water mixing issues occurred were collected. Corrosion-induced pits, oxides, and contaminants were observed at locations where two plates are regularly in contact. The EDS analysis of the surface oxides and contaminants revealed that they were composed of carbon, silicon, and magnesium, which came from chemical adhesives. The IC/ICP analyses showed that the concentration of chloride ions was 30 ~ 40 ppm, which was not sufficient to cause corrosion of stainless steel. In the crevice, a local decrease in dissolved oxygen occurs along with an increase in chloride ions, thus forming an acidic environment. These environments destroyed the passive film of stainless steel, resulting in pits. Moreover, contaminants formed a narrower gap between the two metal plates and inhibited the diffusion of ions, thereby accelerating crevice corrosion.

Keywords

Acknowledgement

본 연구는 한국지역난방공사와 2021년도 정부(산업통상자원부)의 재원으로 한국산업기술진흥원의 지원을 받아 연구를 수행하였습니다(P0002019, 2021년 산업전문인력역량강화사업).

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