TY - GEN
T1 - Threshold conditions for concrete reinforcing steel corrosion in Barakah nuclear power plants, UAE
AU - Qasem, Marvam
AU - Yi, Yongsun
AU - Cho, Pyungyeon
AU - Al Hanaei, Sara
PY - 2015
Y1 - 2015
N2 - The electrochemical properties and threshold conditions for depassivation of reinforcing steel from Barakah nuclear power plants (Barakah NPP) were evaluated using potentiodynamic (PD), potentiostatic (PS), and galvanostatic (GS) polarization techniques. In potentiodynamic polarization of the steel, pitting-like behavior was observed in high concentration of NaCI while no corrosion occurred in low concentration of NaCI. The potentiostatic polarization curves of the steel were dependent on the applied potential, which is similar to that well known for stainless steels. However, no current density spikes before the increase in the current densities were observed. For the threshold condition determination, pre-passivated carbon steel samples in saturated Ca(OH)2 were galvanostatically polarized in Ca(OH)22 solutions with different concentrations of NaCI and potential variation was monitored. From these tests, a linear relationship between hydroxyl ions and chloride ions on the threshold conditions was obtained. Also, it was found that artificially damaged surface by a potenti-ostatic polarization was depassivated by smaller chloride concentration than pre- passivated samples in saturated Ca(OH)2 solution.
AB - The electrochemical properties and threshold conditions for depassivation of reinforcing steel from Barakah nuclear power plants (Barakah NPP) were evaluated using potentiodynamic (PD), potentiostatic (PS), and galvanostatic (GS) polarization techniques. In potentiodynamic polarization of the steel, pitting-like behavior was observed in high concentration of NaCI while no corrosion occurred in low concentration of NaCI. The potentiostatic polarization curves of the steel were dependent on the applied potential, which is similar to that well known for stainless steels. However, no current density spikes before the increase in the current densities were observed. For the threshold condition determination, pre-passivated carbon steel samples in saturated Ca(OH)2 were galvanostatically polarized in Ca(OH)22 solutions with different concentrations of NaCI and potential variation was monitored. From these tests, a linear relationship between hydroxyl ions and chloride ions on the threshold conditions was obtained. Also, it was found that artificially damaged surface by a potenti-ostatic polarization was depassivated by smaller chloride concentration than pre- passivated samples in saturated Ca(OH)2 solution.
UR - https://www.scopus.com/pages/publications/85025608563
M3 - Conference contribution
AN - SCOPUS:85025608563
T3 - European Corrosion Congress, EUROCORR 2015
SP - 915
EP - 924
BT - European Corrosion Congress, EUROCORR 2015
T2 - European Corrosion Congress, EUROCORR 2015
Y2 - 6 September 2015 through 10 September 2015
ER -