Effect of water chemistry on the oxide film on Alloy 690 during simulated hot functional testing of a pressurised water reactor

Influence of later-dissolved oxygen on microstructural changes in oxide films formed on Alloy 690TT in hydrogenated primary water

“…To form such a protective oxide film and to decrease the corrosion rate, a certain hydrogen partial pressure is maintained in primary water to maintain a reducing environment during the nuclear reactor operation. The microstructure and chemical composition of surface oxide films formed on Ni-based alloys in simulated normal hydrogenated primary water containing B and Li have been extensively studied [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. It is widely agreed that an oxide film grown on Alloy 690TT consists of an outer layer containing mixed spinel oxide particles of Ni, Cr, and Fe, and an inner layer containing continuous and compact Cr-rich oxides.…”

Oxidation model for construction materials in supercritical water—Estimation of kinetic and transport parameters

“…To maintain a quasi-steady state in the system with a very low increment of thickness for most of the exposure time, Betova et al [112] proposed that the film growth at the inner interface must be very nearly compensated for by dissolution at the outer interface, i.e. the oxidation rate constant must be almost equal to the dissolution rate constant of the corrosion layer (i.e.…”

Influence of dissolved oxygen concentration on the oxide film formed on Alloy 690 in high temperature water

“…Up to now, in order to elucidate the oxidation process, some studies have been done to analyze the formed oxide films [2][3][4][5][6][7][8][9]. And the effects of different water chemistry parameters such as dissolved hydrogen (DH) [10][11][12][13][14], pH [15,16], temperature [15,17,18], Li concentration [19] and Zn injection [20,21] on the oxidation behaviors of Ni-base alloys have also been investigated. Dissolved oxygen concentration (DO) is also an important parameter that is worthy of scientific research efforts because it can significantly affect the oxidation behavior and hence the service performance of materials.…”