판형 열교환기 전열판의 부식 파손 분석Corrosion Failure Analysis of Flow Plate in Plate Heat Exchanger
- Other Titles
- Corrosion Failure Analysis of Flow Plate in Plate Heat Exchanger
- Authors
- 이수열; 송민지; 최가현; 채호병; 김우철; 김희산; 김정구
- Issue Date
- 31-Aug-2021
- Publisher
- 한국부식방식학회
- Keywords
- Plate heat exchanger; Flow plate; Crevice corrosion; Adhesive
- Citation
- CORROSION SCIENCE AND TECHNOLOGY, v.20, no.4, pp.204 - 209
- Journal Title
- CORROSION SCIENCE AND TECHNOLOGY
- Volume
- 20
- Number
- 4
- Start Page
- 204
- End Page
- 209
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/16269
- DOI
- 10.14773/cst.2021.20.4.204
- ISSN
- 1598-6462
- 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.
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