Abstract
The scratch electrode system in high temperature high pressure (HTHP) water has been built. The design temperature and design pressure of this system are 350°C and 20MPa respectively, and the maximum scratch speed is 3.3m/s. By using this scratch electrode system, the repassivation kinetics of Alloy 690 in high temperature pressurized water with different dissolved hydrogen (DH) at 300°C is studied. The research results justify that the scratch electrode system is valid and the scratch technique in HTHP water is a new effective and reliable method to study the SCC susceptibility of nuclear materials.
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