Conference Proceedings Paper
EFFECT OF SURFACE MODIFICATION ON THE CORROSION RESISTIVITY IN SUPERCRITICAL WATER
The 5th International Symposium on SuperCritical Water-cooled Reactors - 2011 March 13-16
Sami Penttilä (Technical Research Centre of Finland)
Ákos Horváth (Hungarian Academy of Sciences )
Aki Toivonen (Technical Research Centre of Finland)
Zsolt Zolnai (Hungarian Academy of Sciences)
This paper summarizes the results of high temperature corrosion studies of the candidate austenitic alloys at relevant operating conditions for SCWR. The high temperature and pressure above the thermodynamic critical point of water result in higher oxidation rate which might be critical for thin-wall components like fuel cladding. The goal of this work was to study the effect of surface preparation on the oxidation rate on Ti-stabilized austenitic alloy 1.4970. Surfaces were prepared with ion implantation using He+- and N+-ions. Samples were immersed in supercritical water at 650°C/25 MPa, for up to 2000 hours. Added to this, conventional surface treatments were conducted for austenitic alloy 316L tube samples in order to study the effect of cold work in sample surface on corrosion resistance. The corrosion rate was evaluated by measuring the weight change of the samples. The compositions of the oxide layers were analyzed using scanning electron microscope (SEM) in conjunction with Energy Dispersive Spectroscopy (EDS).
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