Effect of Gamma Radiation on Electrochemical Behavior of 9Cr-1Mo Alloy in NaCl Solution

The electrochemical behaviors of 9Cr-1Mo alloy have been studied in 0.1M NaCl solution(pH: 6.6) at 25 .deg. C under γ-radiation(Ce137, 1.5x105 rad/hr)where a variety of radiolytic species, that may change the redox reactions involved in the electrochemical processes, is known to be produced. It was found that γ-radiation causes the positive shift in the open-circuit potential of 9Cr-1Mo in NaCl solution, generating the additional cathodic reactions by radiolysis of NaCl solution, but the properties of the oxide films formed on 9Cr-1Mo in this solution were not affected by γ-radiation. Among the radiolytic products, H2O2 has an important role in determining the corrosion conditions of the irradiated NaCl solution. It provides an additional cathodic reaction, thereby shifting the open-circuit potential of 9Cr-1Mo alloy in the noble direction