아황산나트륨을 이용한 스프링클러 동배관 공식 부식 방지 Inhibition of Pitting Corrosion of Copper Tubes in Wet Sprinkler Systems by Sodium Sulfite

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Inhibition of pitting corrosion of the copper sprinkler tubes by removing dissolved oxygen in water with sodium sulfite was studied on the wet sprinkler systems operated in 258 household sites. First, air in the sprinkler tubing was removed by vacuum pumping. The tube was then filled with sodium sulfite dissolved in water. Sodium sulfite was very effective in maintaining a very low dissolved oxygen concentration in water in the sprinkler tube for the observation period of six months. Water leakage from the copper sprinkler tube was reduced significantly by using sodium sulfite. Both pitting corrosion process and pitting corrosion inhibition mechanism were investigated by examining microscopical and structural aspects of corrosion pits formed in failed copper sprinkler tube. Pitting corrosion was caused by pressurized air as well as sediments such as sand particles in copper tubes through oxygen concentration cells. It was confirmed microscopically that growth of corrosion pits was stopped by reducing dissolved oxygen concentration to a very level by using sodium sulfite.
Publisher
CORROSION SCIENCE SOC KOREA
Issue Date
2017-10
Language
Korean
Article Type
Article
Citation

CORROSION SCIENCE AND TECHNOLOGY-KOREA, v.16, no.5, pp.265 - 272

ISSN
1598-6462
DOI
10.14773/cst.2017.16.5.265
URI
http://hdl.handle.net/10203/240125
Appears in Collection
MS-Journal Papers(저널논문)
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