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자료유형
학술저널
저자정보
저널정보
한국부식방식학회 Corrosion Science and Technology Corrosion Science and Technology 제19권 제2호
발행연도
2020.1
수록면
89 - 99 (11page)

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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.

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