The results of electrochemical measurements on the corrosion of NiCrFe Alloy 600 and Zircaloy-2 in slightly alkaline lithiated water at 288 C (550 F) are presented. The study showed that, in the presence of dissolved hydrogen at the level of 35 Scc/kg-H2O, the electrochemical techniques could not be used to measure the corrosion rate of NiCrFe Alloy 600. However, the measurements on Zircaloy-2 were unaffected by the presence of hydrogen, and good agreement between the electrochemically determined weight gain and the directly measured weight gain resulted. The difference between the behavior of the two alloys is explained by the ease with which redox reactions involving hydrogen occur on the NiCrFe Alloy 600 surfaces.

Subject
Working electrodes, Cathodic polarization, Water, Stainless alloys, Corrosion currents, Corrosion rate, Autoclaves, Weight gain, Linear polarization, Constants, Electrochemical current, Zirconium alloys, Hydrogen
© 1970 National Association of Corrosion Engineers
1970
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