The anodic behavior of alloy 690 in simulated PWRs primary water at 290℃
?The anodic behavior of Alloy 690 in simulated PWR primary water at 290°C
著者:
Tichun Dan Kazuhko Sakaguchi Zhanpeng Lu Tetsuo Shoji Jianqiu Wang Eenhou Han Wei Ke
発刊日:
公開日:
Alloy 690anodic polarizationEIShydrogenM-S plotXPS
概要
This study investigates the anodic behavior of Alloy 690 thermal treated (TT) in Pressurized Water Reactors (PWRs) primary water at 290°C, 9 MPa by means of polarization measurement, electrochemical impedance spectroscopy (EIS) and X-ray photoelect ron spectroscopy (XPS) analysis. Experimental results of hydrogen charged and uncharged Alloy 690TT show that hydrogen increases anodic steady current density and decreases capacitance loop, which implies that charged hydrogen changes the electroch emical processes in the growth of oxide film. Elemental distribution along depth profile by XPS analysis indicates that oxide film increases after hydrogen charging at 0.277VSHE (0.3Vag/Agci) and this changing of outer layer of the oxide film is un related to oxidation of chromium and hydrogen maybe accelerate oxidation of nickel and iron. Charged hydrogen probably accelerates oxidation of chromium in the inner oxide layer.
