Browse > Article
http://dx.doi.org/10.14773/cst.2018.17.6.287

Corrosion Behavior of Boiler Tube under Circulation Water Conditions in District Heating System  

Hong, Minki (Department of Materials Science and Engineering, Chungnam National University)
Cho, Jeongmin (Department of Materials Science and Engineering, Chungnam National University)
Song, Min Ji (Department of Materials Science and Engineering, Chungnam National University)
Kim, Woo Cheol (Frontier Research & Training Institute, Korea District Heating Corp.)
Ha, Tae Baek (Frontier Research & Training Institute, Korea District Heating Corp.)
Lee, Soo Yeol (Department of Materials Science and Engineering, Chungnam National University)
Publication Information
Corrosion Science and Technology / v.17, no.6, 2018 , pp. 287-291 More about this Journal
Abstract
In this study, corrosion behavior of a SA178-A alloy used in the boiler tube of a district heating system was investigated in different environments where it was exposed to pure water, district heating (DH) water, and filtered district heating (FDH) water. After the corrosion test, the surface morphology was examined for observation of the number of pitting sites and pitting area fraction, using a scanning electron microscope. The DH water and FDH water conditions resulted in a lower corrosion potential and pitting potential, and revealed a significantly higher corrosion rate than the pure water condition. The pitting sites in the DH water (pH 9.6) were approximately eighteen times larger than those in the pure water (pH 9.6). Compared to the DH water, the corrosion potential became more noble in the FDH water condition, where iron ions were reduced through filtration. However, the corrosion rate increased in the FDH water due to an increased concentration of chloride ions, which deteriorated the stability of passive film.
Keywords
District heating system; Boiler water; Corrosion; Potentiodynamic polarization;
Citations & Related Records
연도 인용수 순위
  • Reference
1 H. Lund, B. Moller, B. V. Mathiesen, and A. Dyrelund, Energy, 35, 1381 (2010).   DOI
2 Y. S. Chang, S. W. Jung, S. M. Lee, J. B. Choi, and Y. J. Kim, Appl. Therm. Eng., 27, 2524 (2007).   DOI
3 P. A. Ostergaard and H. Lund, Appl. Energ., 88, 479 (2011).   DOI
4 H. Gadd and S. Werner, Appl. Energ., 106, 47 (2013).   DOI
5 D. Connolly, H. Lund, B. V. Mathiesen, S. Werner, B. Moller, U. Persson, T. Boermans, D. Trier, P. A. Ostergaard, and S. Nielsen, Energ. Policy, 65, 475 (2014).   DOI
6 H. Lund, S. Werner, R. Wiltshire, S. Svendsen, J. E. Thorsen, F. Hvelplund, and B. V. Mathiesen, Energy, 68, 1 (2014).   DOI
7 F. D. Fatah, A. Mostafaei, R. H. Taghani, and F. Nasirpouri, Eng. Fail. Anal., 28, 69 (2013).   DOI
8 KS B 6209, Water conditioning for boiler feed water and boiler water (2017).
9 Y. S. Kim and J. G. Kim, Eng. Fail. Anal., 83, 193 (2018).   DOI