스프링클러 구리배관의 공식 파손 억제
Inhibition of Pitting Corrosion Failure of Copper Tubes in Wet Sprinkler Systems
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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 thenfilling the tubes with water were developed. Using this apparatus and technology, three methods for inhibitingthe 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 reducethe dissolved oxygen concentration to lower than 2 ppm. In the second method, the dissolved oxygen concentrationof water was further reduced to lower than 0.01 ppm by sodium sulfite. In the third method, the sprinklertubes 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-rayphotoelectron spectroscopy analyses confirmed that a Cu-BTAH layer was well coated on the inside surfaceof the corrosion pit, protecting it from corrosion. A potentiodynamic polarization test showed that BTAHshould be very effective in reducing the corrosion rate of copper in the acidic environment of the corrosionpit.
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 thenfilling the tubes with water were developed. Using this apparatus and technology, three methods for inhibitingthe 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 reducethe dissolved oxygen concentration to lower than 2 ppm. In the second method, the dissolved oxygen concentrationof water was further reduced to lower than 0.01 ppm by sodium sulfite. In the third method, the sprinklertubes 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-rayphotoelectron spectroscopy analyses confirmed that a Cu-BTA layer was well coated on the inside surfaceof the corrosion pit, protecting it from corrosion. A potentiodynamic polarization test showed that BTAHshould be very effective in reducing the corrosion rate of copper in the acidic environment of the corrosionpit.
참고문헌 (21)
- 이재봉, "스프링클러 동배관의 공식부식 발생원인", CORROSION SCIENCE AND TECHNOLOGY, 13(1), pp.6~14 (2014), 한국부식방식학회[DOI]
- Sang Hee Suh, "Analysis of pitting corrosion failure of copper tubes in an apartment fire sprinkler system", Engineering Failure Analysis, 64, pp.111~125 (2016), Elsevier BV[DOI]
- 서상희, "아황산나트륨을 이용한 스프링클러 동배관 공식 부식 방지", CORROSION SCIENCE AND TECHNOLOGY, 16(5), pp.265~272 (2017), 한국부식방식학회[DOI]
- Research report: Study on the cause of copper tube corrosion, "J-G. Kim", The Korean Institute of Surface Engineering, ~ (2016)
- 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)
- A. Fateh, "Review of corrosive environments for copper and its corrosion inhibitors", Arabian Journal of Chemistry, 13(1), pp.481~544 (2020), Elsevier BV[DOI]
- H. B Madsen, , Stud. in Cons, 12, pp.163~ (1967)
- Research report: Test application of the technology for corrosion inhibition of wet sprinkler tubing, "S. H. Suh", ~ (2019)
- 서영준, "Pitting Corrosion Inhibition of Sprinkler Copper Tubes via Forming of Cu-BTA Film on the Inner Surface of Corrosion pits", CORROSION SCIENCE AND TECHNOLOGY, 18(2), pp.39~48 (2019), 한국부식방식학회
- Research report: Extended application of the technology for corrosion inhibition of wet sprinkler tubing, "S. H. Suh", ~ (2019)
- D. A. Jones, "Principles and Prevention of Corrosion" (1995), Pearson Education
- Matjaž Finšgar, "Inhibition of copper corrosion by 1,2,3-benzotriazole: A review", Corrosion Science, 52(9), pp.2737~2749 (2010), Elsevier BV[DOI]
- FLORIAN MANSFELD, "Benzotriazole as Corrosion Inhibitor for Copper II. Acid NaCl Solutions", CORROSION, 29(3), pp.105~107 (1973), NACE International[DOI]
- Rinju Youda, "Sers and impedance study of the equilibrium between complex formation and adsorption of benzotriazole and 4-hydroxybenzotriazole on a copper electrode in sulphate solutions", Electrochimica Acta, 35(6), pp.1011~1017 (1990), Elsevier BV[DOI]
- Mary Ellen Biggin, "Infrared Studies of Benzotriazole on Copper Electrode Surfaces: Role of Chloride in Promoting Reversibility", Journal of The Electrochemical Society, 148(5), pp.C339~ (2001), The Electrochemical Society[DOI]
- J. F. Moulder, "Handbook of X-ray Photoelectron Spectroscopy" (1995), Physical Electronics, Inc
- B.V. Appa Rao, "X-ray photoelectron spectroscopy depth-profiling analysis of surface films formed on Cu–Ni (90", 10) alloy in seawater in the absence and presence of 1,2,3-benzotriazole, 2014, pp.556, 337~344[DOI]
- G.P. Cicileo, "Comparative study of organic inhibitors of coppercorrosion", Corrosion Science, 41(7), pp.1359~1375 (1999), Elsevier BV[DOI]
- Anton Kokalj, "Ab initio modeling of the bonding of benzotriazole corrosion inhibitor to reduced and oxidized copper surfaces", Faraday Discussions, 180, pp.415~438 (2015), Royal Society of Chemistry (RSC)[DOI]
- I. Milosev, , Chem. Biochem. Eng. Q, 23, pp.53~ (2009)[DOI]
- "Aluminum Surface Finishing Corrosion Causes and Troubleshooting" (2014)[URL]