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Vol.41, No.8, 489 ~ 495, 2003
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| Title |
| A Study on Galvanic Sensors for Monitoring the Corrosion Damage of the Steel Embedded in Concrete Structures - Part 1: Electrochemical tests of galvanic sensors in pore solution |
| 유지홍 Yu Ji Hong , 박진택 Park Jin Taeg , 김정구 Kim Jeong Gu , 정란 Jeong Lan |
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| Abstract |
| The correlation between sensor output and corrosion rate of reinforcing steel was evaluated by laboratory electrochemical tests in saturated Ca(OH)_(2) solution with 3.5wt.％ NaCl. In this paper, two types of electrochemical probes were developed: galvanic cells containing of steel/copper and steel/stainless steel couples. The corrosion behavior in saturated Ca(OH)_(2) solution with or without 3.5 wt％ NaCl addition for the different electrodes was investigated by potentiodynamic test. Weight loss measurement and galvanic corrosion test were conducted to obtain the corrosion rate of reinforcing steel and the charge of sensor in saturated Ca(OH)_(2) solution with 3.5 wt.％ NaCl addition, respectively. The results of the potentiodynamic test indicated the possibility of detecting an ingress point of chlorides by measuring the galvanic current. In galvanic corrosion tests, the galvanic current of steel/copper couple was higher than that of steel-stainless steel couple, i.e., the steel/copper sensor is more suitable for high resistance environment. The steel/stainless sensor showed a better linear correlation than the steel/copper sensor. Through the relationship between the sensor system output and the weight loss of steel, real corrosion damage of the steel embedded in concrete can be detected. |
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| Key Words |
| Galvanic sensor system, Potentiodynamic test, Immersion test, Galvanic corrosion test, 3.5 wt% sodium chloride, NaCl, Calcuim hydroxide, Ca(OH)2 |
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