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Long-term monitoring of atmospheric corrosion at weathering steel bridges by an electrochemical impedance method
Weathering steel corrosion was monitored for one to two years under natural atmosphere by an electrochemical impedance technique. Two identical comb-shape weathering steel sheets embedded in epoxy resin were used as monitoring probe electrodes at two different bridges in Japan. Impedances at 10 kHz (Z10 kHz) and 10 mHz (Z10mHz) were automatically measured every hour. Coupons (50 × 50 × 2 mm³) prepared from the same steel sheets were exposed together to measure the corrosion mass loss. The average (Z10 mHz)-1 value for half to one year exposure correlated well with the average corrosion rate determined from the corrosion mass loss. An empirical equation was obtained as follows: Icorr(Av)=1,7×10-5×Z-110 mHz(Av)0.16. The EIS behavior of the weathering steel probe exposed to natural environmental conditions for one year was measured under various RH in a laboratory chamber. The EIS was successfully described by a distributed-type equivalent circuit. Instantaneous (Z10 mHz-1 increased gradually with increasing RH before rapidly increasing above 80%RH. Its temperature dependence was very little in comparison with its RH dependence. The electrochemical impedance technique is beneficial for the atmospheric corrosion monitoring of steels.
Long-term monitoring of atmospheric corrosion at weathering steel bridges by an electrochemical impedance method
Weathering steel corrosion was monitored for one to two years under natural atmosphere by an electrochemical impedance technique. Two identical comb-shape weathering steel sheets embedded in epoxy resin were used as monitoring probe electrodes at two different bridges in Japan. Impedances at 10 kHz (Z10 kHz) and 10 mHz (Z10mHz) were automatically measured every hour. Coupons (50 × 50 × 2 mm³) prepared from the same steel sheets were exposed together to measure the corrosion mass loss. The average (Z10 mHz)-1 value for half to one year exposure correlated well with the average corrosion rate determined from the corrosion mass loss. An empirical equation was obtained as follows: Icorr(Av)=1,7×10-5×Z-110 mHz(Av)0.16. The EIS behavior of the weathering steel probe exposed to natural environmental conditions for one year was measured under various RH in a laboratory chamber. The EIS was successfully described by a distributed-type equivalent circuit. Instantaneous (Z10 mHz-1 increased gradually with increasing RH before rapidly increasing above 80%RH. Its temperature dependence was very little in comparison with its RH dependence. The electrochemical impedance technique is beneficial for the atmospheric corrosion monitoring of steels.
Long-term monitoring of atmospheric corrosion at weathering steel bridges by an electrochemical impedance method
Langzeit-Korrosionsüberwachung der atmosphärischen Korrosion an einer Brücke aus witterungsbeständigem Stahl durch eine elektrochemische Impedanzmethode
Nishikata, Atsushi (author) / Zhu, Qingjun (author) / Tada, Eiji (author)
Corrosion Science ; 87 ; 80-88
2014
9 Seiten, 18 Bilder, 1 Tabelle, 33 Quellen
Article (Journal)
English
Stahlbrücke , witterungsbeständiger Stahl , Korrosionsüberwachung , Scheinwiderstandsmessung , Frequenzgang , Langzeitmessung , atmosphärische Korrosion , Gewichtsverlust , Messeinrichtung , relative Feuchte , Temperatureinfluss , Korrosionsgeschwindigkeit , Korrelationsgleichung , Chromstahl , Nickelstahl
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