Abstract
General corrosion of nickel- base alloys 690 and 800 has been studied in a simulated pressurized water reactor(PWR) primary water environment containing 10 μg/kg Zn. After exposed for 1000 h, the oxide scales formed on the alloy surface are characterized by scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS). The results show that the corrosion weight gain of alloy 690 is lower than that of alloy 800, and the oxide scale on alloy 690 is thinner than that on alloy 800. The oxide scale is double layered consisted of an outer layer rich in Fe and Zn and an inner layer rich in Cr. The phase constituents of the oxide scale change from(Zn, Fe, Ni)(Fe,Cr)2O4gradually to ZnCr2O4and Cr2O3with the increase of distance to the outer surface.
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