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Vol.41, No.12, 902 ~ 909, 2003
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| Title |
| Corrosion Characteristics of Copper Pipe in Potable Water System |
| 심재주 Sim Jae Ju , 신동호 Sin Dong Ho , 최윤석 Choe Yun Seog , 김정구 Kim Jeong Gu , 유승재 Yu Seung Jae |
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| Abstract |
| The corrosion behavior of copper in neutral aerated synthetic tap water was investigated using electrochemical methods, SEM and XPS. All potentiodynamic polarization curves showed active corrosion behavior, and the corrosion rate was more sensitive to flow velocity than Cl^(-) ion concentration and temperature. The result of potentiostatic test indicated that the current density decreased with increasing time regardless of Cl^(-) ion concentration and temperature in stagnant condition because copper compounds were formed uniformly on the surface. The EIS plot was changed from two time constants to three time constants with the formation of Cu₂O, and the charge transfer resistance (R_(ct)) was very large and increased with increasing immersion time. From all results, copper had good corrosion resistance in this potable water system. |
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| Key Words |
| Copper, Tap water, Electrochemical methods, SEM, XPS, Copper oxide, Corrosion behavior |
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