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Balak, Juraj
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document
Investigation of coatings, applied by PVD, for the corrosion protection of materials in supercritical water
Abstract
Plasma coatings, applied by physical vapour deposition, as well as plasma surface treatments could find interesting applications in the nuclear field, both for existing types of reactors as well as for generation IV reactors (such as the supercritical water reactor). <br/>A large variety of industrially available coatings exists. Among these, the following coatings (PVD) were investigated: TiAlN, CrN and ZrO2. Small coated samples (AISI 316L and Inconel 600) were exposed to supercritical water (at 650 °C, 250 bar) during about 1000 h at an oxygen content of 150 ppb. <br/>Whereas the performance of the TiAlN and the ZrO2 coatings was not satisfactory, the CrN coating was found to provide a stable and protective corrosion barrier. <br/>The CrN coated Inconel 600 base metal shows that chromium creates approximately 0.5 µm wide stable natural passivation oxide layer which protects the surface from further corrosion attack during exposure to SCW. <br/>Weight gain measurements on the CrN coated samples were performed as well but did not show any significant change after exposure.