High-temperature oxidation kinetics of sponge-based E110 cladding alloy
| Autor: | Benton E. Garrison, Michael Howell, Yong Yan, G. L. Bell |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Cladding (metalworking)
Arrhenius equation Nuclear and High Energy Physics Materials science Hydrogen 020209 energy Alloy Oxide Analytical chemistry chemistry.chemical_element 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Oxygen Corrosion chemistry.chemical_compound symbols.namesake Reaction rate constant Nuclear Energy and Engineering chemistry 0202 electrical engineering electronic engineering information engineering engineering symbols General Materials Science 0210 nano-technology |
| Zdroj: | Journal of Nuclear Materials. 499:595-612 |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2017.10.067 |
| Popis: | Two-sided oxidation experiments were recently conducted at 900°C–1200 °C in flowing steam with samples of sponge-based Zr-1Nb alloy E110. Although the old electrolytic E110 tubing exhibited a high degree of susceptibility to nodular corrosion and experienced breakaway oxidation rates in a relatively short time, the new sponge-based E110 demonstrated steam oxidation behavior comparable to Zircaloy-4. Sample weight gain and oxide layer thickness measurements were performed on oxidized E110 specimens and compared to oxygen pickup and oxide layer thickness calculations using the Cathcart-Pawel correlation. Our study shows that the sponge-based E110 follows the parabolic law at temperatures above 1015 °C. At or below 1015 °C, the oxidation rate was very low when compared to Zircaloy-4 and can be represented by a cubic expression. No breakaway oxidation was observed at 1000 °C for oxidation times up to 10,000 s. Arrhenius expressions are given to describe the parabolic rate constants at temperatures above 1015 °C and cubic rate constants are provided for temperatures below 1015 °C. The weight gains calculated by our equations are in excellent agreement with the measured sample weight gains at all test temperatures. In addition to the as-fabricated E110 cladding sample, prehydrided E110 cladding with hydrogen concentrations in the 100–150 wppm range was also investigated. The effect of hydrogen content on sponge-based E110 oxidation kinetics was minimal. No significant difference was found between as-fabricated and hydrided samples with regard to oxygen pickup and oxide layer thickness for hydrogen contents below 150 wppm. |
| Databáze: | OpenAIRE |
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