화학공학소재연구정보센터
Applied Surface Science, Vol.426, 514-526, 2017
Effects of lead on oxidation behavior of Alloy 690TT within a high temperature aqueous environment
The chemical compositions, phases and structures of two oxide films on Alloy 690TT following exposure for 4400h in pure water with and without lead at 320 degrees C were studied by surface analysis techniques. The analysis of a lead-doped oxide film prepared by a focused ion beam (FIB) demonstrated that both Cr-rich and Ni-rich oxides were alternatively distributed within the outer layer, whereas the inner layer was porous and poorly protected, causing severe corrosion of the alloy and a thicker film was formed. A duplex film model was proposed for the effects discussion of lead on the oxidation mechanism. (C) 2017 Published by Elsevier B.V.