구리 배관의 Sn 첨가에 따른 응력 및 다양한 환경에서의 부식 특성
Corrosion characteristics in stress and various environments with Sn addition to Cu pipe
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Cu as a heat exchanger tube is an important component in thermal fluid transfer. However, Cu tubes are exposed to stress in certain environments, leading to stress corrosion cracking (SCC). In this study, the effect of Sn addition on microstructure and corrosion characteristics was examined. The microstructural examination revealed the presence of columnar crystal and a grain refinement due to the addition of Sn. Electrochemical measurements showed that the 5 wt.% NH3 environment was the most vulnerable environment to Cu corrosion, and the corrosion current density increased as stress increased. The immersion test exhibited the formation of Cu2O and Cu(OH)2 corrosion product in 3.5 wt.% NaCl and 5 wt.% NH3 environments, respectively. Results indicated that Sn addition to Cu was an important factor in improving the mechanical strength.
Abstract
Cu as a heat exchanger tube is an important component in thermal fluid transfer. However, Cu tubes are exposed to stress in certain environments, leading to stress corrosion cracking (SCC). In this study, the effect of Sn addition on microstructure and corrosion characteristics was examined. The microstructural examination revealed the presence of columnar crystal and a grain refinement due to the addition of Sn. Electrochemical measurements showed that the 5 wt.% NH3 environment was the most vulnerable environment to Cu corrosion, and the corrosion current density increased as stress increased. The immersion test exhibited the formation of Cu2O and Cu(OH)2 corrosion product in 3.5 wt.% NaCl and 5 wt.% NH3 environments, respectively. Results indicated that Sn addition to Cu was an important factor in improving the mechanical strength.
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