Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Inhibition of Pitting Corrosion Failure of Copper Tubes in Wet Sprinkler Systems

스프링클러 구리배관의 공식 파손 억제

  • 서상희 (서앤서코로죤엔지니어링(주)) ;
  • 서영준 (서앤서코로죤엔지니어링(주)) ;
  • 이종혁 (서앤서코로죤엔지니어링(주)) ;
  • 권혁상 (한국과학기술원 신소재공학과)
  • Received : 2020.03.13
  • Accepted : 2020.04.15
  • Published : 2020.04.29
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Abstract

The inhibition of pitting corrosion failure of copper sprinkler tubes in wet sprinkler systems was studied. First, an apparatus and technology for removing air in the sprinkler tubes by vacuum pumping and then filling the tubes with water were developed. Using this apparatus and technology, three methods for inhibiting the pitting corrosion of the copper sprinkler tubes installed in several apartment complexes were tested. The first one was filling the sprinkler tubes with water bubbled by high-pressure nitrogen gas to reduce the dissolved oxygen concentration to lower than 2 ppm. In the second method, the dissolved oxygen concentration of water was further reduced to lower than 0.01 ppm by sodium sulfite. In the third method, the sprinkler tubes were filled with benzotriazole (BTAH) dissolved in water. The third method was the most effective, reducing the failure frequency of the sprinkler tubes due to pitting corrosion by more than 80%. X-ray photoelectron spectroscopy analyses confirmed that a Cu-BTA layer was well coated on the inside surface of the corrosion pit, protecting it from corrosion. A potentiodynamic polarization test showed that BTAH should be very effective in reducing the corrosion rate of copper in the acidic environment of the corrosion pit.

Keywords

References

  1. J-B. Lee and H. Jung, Corros. Sci. Tech., 13, 6 (2014). https://doi.org/10.14773/cst.2014.13.1.6
  2. S. H. Suh, Y. J. Suh, H. G. Yoon, J. H. Oh, Y. J. Kim, K. M. Jung, and H. S. Kwon, Eng. Fail. Anal., 64, 111 (2016). https://doi.org/10.1016/j.engfailanal.2016.03.009
  3. S. H. Suh, Y. J. Suh, and H. S. Kwon, Corros. Sci. Tech., 16, 265 (2017). https://doi.org/10.14773/cst.2017.16.5.265
  4. J-G. Kim, Research report: Study on the cause of copper tube corrosion, The Korean Institute of Surface Engineering (2016).
  5. S.H. Suh, Apparatus and methods for drain, vent and water filling for wet type sprinkler systems, Korea Patent No. 10-1938819 and 10-1956159 (2019). https://doi.org/10.8080/1020170032686?urlappend=en
  6. A. Fateh, M. Aliofkhazraei, and A. R. Rezvanian, Arab. J. Chem., 13, 481 (2017). https://doi.org/10.1016/j.arabjc.2017.05.021
  7. H. B Madsen, Stud. in Cons., 12, 163 (1967). https://doi.org/10.1179/sic.1967.017
  8. S. H. Suh, Research report: Test application of the technology for corrosion inhibition of wet sprinkler tubing (2019).
  9. S. H. Suh, Y. J. Suh, S. H. Kim, J-M. Yang, and G. T. Kim, Corros. Sci. Tech., 18, 39 (2019). https://doi.org/10.14773/cst.2019.18.2.39
  10. S. H. Suh, Research report: Extended application of the technology for corrosion inhibition of wet sprinkler tubing (2019).
  11. D. A. Jones, Principles and Prevention of Corrosion, Pearson Education (1995).
  12. M. Finsgar and I. Milosev, Corros. Sci., 52, 2737 (2010). https://doi.org/10.1016/j.corsci.2010.05.002
  13. F. Mansfeld and T. Smith, Corrosion, 29, 105 (1973). https://doi.org/10.5006/0010-9312-29.3.105
  14. R. Youda, H. Nishihara, and K. Aramaki, Electrochim. Acta, 35, 1011 (1990). https://doi.org/10.1016/0013-4686(90)90036-Y
  15. M. E. Biggin and A. A. Gewirth, J. Electrochem. Soc., 148, C339 (2001). https://doi.org/10.1149/1.1359202
  16. J. F. Moulder, W. F. Stickle, P. E. Sobol, and K. D. Bomben, Handbook of X-ray Photoelectron Spectroscopy, in: J. Chastain, R. C. King Jr. (eds.), Physical Electronics, Inc., Eden Prairie, Minnesota (1995).
  17. B. V. A. Rao, K. C. Kumara, and N. Y. Hebalkar, Thin Solid Films, 556, 337 (2014). https://doi.org/10.1016/j.tsf.2014.02.054
  18. G. P. Cicileo, I. B. M. Rosales, F. E. Varela, and J. R. Vilche, Corros. Sci., 41, 1359 (1999). https://doi.org/10.1016/S0010-938X(98)00190-5
  19. A. Kokalj, Faraday Discuss., 180, 415 (2015). https://doi.org/10.1039/C4FD00257A
  20. I. Milosev and T. Kosec, Chem. Biochem. Eng. Q., 23, 53 (2009). https://doi.org/10.15255/CABEQ.2014.323
  21. W. J. Fullen, Aluminum Surface Finishing Corrosion Causes and Troubleshooting, Washington (2014). https://www.pfonline.com/articles/aluminum-surface-finishingcorrosion-causes-and-troubleshooting