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Abstract
Corrosion-resistant nickel-based Alloy 600 is susceptible to a lead-induced stress corrosion cracking (PbSCC) in aqueous solutions. The lead species incorporated into the oxide at the alloy surface degrade the passivity and cause a PbSCC. Effects of lead on the properties of the surface passive films were investigated. The cross sections of the surface films were examined by a transmission electron microscopy and the species present in the films were analyzed with an energy dispersive x-ray spectroscopy and an x-ray photoelectron spectroscopy. In-depth concentration profiles of the species were analyzed by using an ion sputtering technique. The electrochemical impedance spectroscopy technique was used to characterize the electrochemical behaviors. Effectiveness of a nickel boride inhibitor was also evaluated. The boride inhibitor altered the properties of the resultant passive film, and significantly reduced the susceptibility of the alloy to a PbSCC.
ACKNOWLEDGMENT
This work was carried out as a part of the Nuclear Research and Development Program sponsored by the Ministry of Education, Science, and Technology in Korea.