Naslov
Anomalous high-temperature oxidation in the zirconium-copper system

Autori
Paljević, Matija ; Tudja, Marijan

Izvornik
Corrosion Science (0010-938X) 46 (2004); 2055-2065

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Zirconium-copper alloys; High temperature corrosion

Sažetak
The high-temperature oxidation of the Zr-3 mass % Cu alloy and Zr2Cu in oxygen is characterized by selective oxidation of zirconium while the excess of copper is accumulated at the alloy-oxide interface forming the Zr8Cu5 phase. The oxidation of Zr2Cu at elevated temperatures shows an anomalous decrease of the oxygen consumption rate in the temperature range 890-975 °C. The oxide layer consists of monoclinic ZrO2 mainly, with preferentially oriented crystallites in depth region at 900 °C and tetragonal ZrO2 on the surface below 600 °C, and small amounts of CuO and Cu2O. The reaction kinetics obeys a parabolic rate law. The activation energy of 117.5 kJ/mol and 54.4 kJ/mol has been estimated for the oxidation of the Zr-3 mass % Cu alloy and Zr2Cu, respectively.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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