Monitoring of Corrosion Rates of Carbon Steel in Mortar under a Wet-Dry Cyclic Condition
2
조회
0
다운로드
0
인용
0
참고문헌
초록
Abstract
The corrosion behavior of metal covered with mortar under a wet-dry cyclic condition were investigatedto apply for the measurement of corrosion rates of reinforcing steel in concrete structure. The carbon steel in mortar having t = 3 mm cover thickness was exposed to the alternate condition of 6 h immersion in chloride containing solu-tion and 18 h drying at 25oC and 50%RH. The electrochemical phenomena of a carbon steel and mortar interface was explained by an equivalent circuit consisting of a solution resistance, a charge transfer resistance and a CPE(Con-stant Phase Element). The corosion rates were monitored continuously during exposure using an AC impedance tech-nique. Simultaneously, the current distribution over the working electrode during impedance measurement was analyzed from the phase shift, θ, in an intermediate frequency. The result showed that corrosion rate monitoring using an AC impedance method is suitable under the given exposure conditions even during the drying period when the metal is covered with the weted mortar.
참고문헌 (10)
- "The influence of Copper upon the atmospheric corrosion of iron" (1987)
- "Influence of Electrolyte Layer Thickness and pH on the Initial Stage of the Atmospheric Corrosion of Iron", 144, pp.1244~ (1997)
- "Electrochemical Impedance Spectroscopy of Metals Covered with a Thin Electrolyte Layer", 41, pp.1057~ (1996)
- "Impedance Characteristics of Corrosion System and Corrosion Monitoring", 48, pp.686~ (1999)
- "Impedance Characteristics of Reinforcing Steel in Mortar and Corrosion Monitoring", 51, pp.54~ (2002)
- "Principles and Prevention of Corrosion, 2nd ed", pp.86~ (1996), Prentice-Hall, Inc., NJ
- "AC Impedance Monitoring of Pitting Corrosion of Stainless Steel under a Wet-Dry Cyclic Condition in Chloride-Containing Environment", 38, pp.1397~ (1996)
- "Electrochemical Studies on Corrosion under a water film", 198, pp.161~ (1995)
- "Influence of Copper on Iron Corrosion in Weakly Alkaline Environment Chloride Ions", 44, pp.396~ (2003)
- "Monitoring of Corrosion Rate of Carbon Steel under Wet", Dry Cycle Conditions and Its Corrosion Mechanism, 1994, ~43