XPS Analysis of Effect of Zinc Addition on Oxide Film on Alloy 800

The effects of zinc addition on the composition of the oxide film on alloy 800 were investigated in simulated pressurized water reactor(PWR) primary water. After exposed in solutions with zinc concentration of 0 and 150 μg/kg for 1 500 h, the oxide films developed on the surface of specimens were analyzed using X-ray photoelectron spectroscopy (XPS). Alloy 800 surface formed a duplex oxide film composed of a Ni-riched outer layer and a Cr-riched inner layer, and Fe-poor in two layers in both solutions. In Zn-injected solution, the original atomic concentration of Zn was 17%, and Zn replaced the Mn2+ in the oxide film more obviously.