Pitting Corrosion Inhibition of Sprinkler Copper Tubes via Forming of Cu-BTA Film on the Inner Surface of Corrosion pits
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초록
The feasibility of using benzotriazole (BTAH) to inhibit pitting corrosion in the sprinkler copper tubeswas investigated by filling the tubes with BTAH-water solution in 829 households at an eight-year-oldapartment complex. The water leakage rate was reduced by approximately 90% following BTAH treatmentduring 161 days from the previous year. The leakage of one of the two sprinkler copper tubes was investigatedwith optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, X-ray photoelectronspectroscopy, and X-ray diffraction analysis to determine the formation of Cu-BTA film inside the corrosionpits. All the inner components of the corrosion pits were coated with Cu-BTA films suggesting that BTAHmolecules penetrated the corrosion products. The Cu-BTA film was about 2 nm in thickness at the bottomof a corrosion pit. A layer of CuCl and Cu2O phases lies under the Cu-BTA film. This complex structureeffectively prevented the propagation of corrosion pits in the sprinkler copper tubes and reduced the waterleakage.
Abstract
The feasibility of using benzotriazole (BTAH) to inhibit pitting corrosion in the sprinkler copper tubeswas investigated by filling the tubes with BTAH-water solution in 829 households at an eight-year-oldapartment complex. The water leakage rate was reduced by approximately 90% following BTAH treatmentduring 161 days from the previous year. The leakage of one of the two sprinkler copper tubes was investigatedwith optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, X-ray photoelectronspectroscopy, and X-ray diffraction analysis to determine the formation of Cu-BTA film inside the corrosionpits. All the inner components of the corrosion pits were coated with Cu-BTA films suggesting that BTAHmolecules penetrated the corrosion products. The Cu-BTA film was about 2 nm in thickness at the bottomof a corrosion pit. A layer of CuCl and Cu2O phases lies under the Cu-BTA film. This complex structureeffectively prevented the propagation of corrosion pits in the sprinkler copper tubes and reduced the waterleakage.
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