XPS Analysis of Zinc Injection Effects on General Corrosion of Nickel-Base Alloy 690

The effects of zinc addition on behaviors of general corrosion behaviors of nickel-base alloy 690 were investigated in simulated PWR primary water. After exposed in solutions with zinc concentration of 0 and 50 ppb for 1 500 h, oxide films developed on surface of specimens were analyzed by using XPS. The result shows that Zn partly replaces Ni and Fe in NiCr₂O₄ and FeCr₂O₄ in the inner oxide layer and forms ZnCr₂O₄.