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http://dx.doi.org/10.14773/cst.2021.20.4.204

Corrosion Failure Analysis of Flow Plate in Plate Heat Exchanger  

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)
Publication Information
Corrosion Science and Technology / v.20, no.4, 2021 , pp. 204-209 More about this Journal
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
Plate heat exchanger; Flow plate; Crevice corrosion; Adhesive;
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