The Effects of Trace PbO on the Oxide Behavior of 304L Stainless Steel in High Temperature Water

摘要

L stainless steel was corroded in a simulated PWR primary circuit at 315C with ppb level PbOtreatment. Corrosion properties and semiconductor behaviors of the oxide layers on SS304L exposedto high temperature and high pressure water corrosion were investigated by electrochemicalpotentiodynamic curves and Mott-Schottky tests. The FE-SEM images suggested some unprotectivespinel crystals formed on the surface of oxide film with trace level PbO treatment. And XPS results+ + indicated not only 2 valance but also 4 and 0 of Pb, cooperated with Iron, Chromium, Nickel andtheir oxides, in the oxide layer.