Calculation of Oxygen Diffusion Coefficients in Oxide Films Formed on Low-Temperature Annealed Zr Alloys and Their Related Corrosion Behavior
The growth of oxide film, which results from the inward oxygen diffusion from a corrosive environment, is a critical consideration for the corrosion resistance of zirconium alloys. This work calculates the oxygen diffusion coefficients in the oxide films formed on zirconium alloys annealed at 400~50...
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MDPI AG
2019-08-01
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| Online Access: | https://www.mdpi.com/2075-4701/9/8/850 |
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| author | Lina Zhang Liang-Yu Chen Cuihua Zhao Yujing Liu Lai-Chang Zhang |
| author_facet | Lina Zhang Liang-Yu Chen Cuihua Zhao Yujing Liu Lai-Chang Zhang |
| author_sort | Lina Zhang |
| collection | DOAJ |
| description | The growth of oxide film, which results from the inward oxygen diffusion from a corrosive environment, is a critical consideration for the corrosion resistance of zirconium alloys. This work calculates the oxygen diffusion coefficients in the oxide films formed on zirconium alloys annealed at 400~500 °C and investigates the related corrosion behavior. The annealed samples have a close size for the second-phase particles but a distinctive hardness, indicating the difference in substrate conditions. The weight gain of all samples highly follows parabolic laws. The weight gain of the sample annealed at 400 °C has the fastest increase rate at the very beginning of the corrosion test, but its oxide film has the slowest growth rate as the corrosion proceeds. By contrast, the sample annealed at 500 °C shows the lowest weight gain but the highest corrosion rate constant. Such a corrosion behavior is attributed to the amount of defects existing in the oxide film formed on the annealed samples; fewer defects would provide a lower fraction of short-circuit diffusion in total diffusion, resulting in a lower diffusion coefficient of oxygen in the oxide film, thereby producing better corrosion resistance. This is consistent with the calculated diffusion coefficients of oxygen in the oxide films: 3.252 × 10<sup>−11</sup> cm<sup>2</sup>/s, 3.464 × 10<sup>−11</sup> cm<sup>2</sup>/s and 3.740 × 10<sup>−11</sup> cm<sup>2</sup>/s for the samples annealed at 400 °C, 450 °C, and 500 °C, respectively. |
| first_indexed | 2024-12-22T11:05:14Z |
| format | Article |
| id | doaj.art-22f887a0f8184a7a818af9a41de11862 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-22T11:05:14Z |
| publishDate | 2019-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-22f887a0f8184a7a818af9a41de118622022-12-21T18:28:21ZengMDPI AGMetals2075-47012019-08-019885010.3390/met9080850met9080850Calculation of Oxygen Diffusion Coefficients in Oxide Films Formed on Low-Temperature Annealed Zr Alloys and Their Related Corrosion BehaviorLina Zhang0Liang-Yu Chen1Cuihua Zhao2Yujing Liu3Lai-Chang Zhang4School of Science, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaSchool of Science, Jiangsu University of Science and Technology, Zhenjiang 212003, ChinaGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Nanning 530004, ChinaSchool of Mechanical and Chemical Engineering, The University of Western Australia, 35 Stirling Highway, Perth 6009, WA, AustraliaSchool of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth 6027, WA, AustraliaThe growth of oxide film, which results from the inward oxygen diffusion from a corrosive environment, is a critical consideration for the corrosion resistance of zirconium alloys. This work calculates the oxygen diffusion coefficients in the oxide films formed on zirconium alloys annealed at 400~500 °C and investigates the related corrosion behavior. The annealed samples have a close size for the second-phase particles but a distinctive hardness, indicating the difference in substrate conditions. The weight gain of all samples highly follows parabolic laws. The weight gain of the sample annealed at 400 °C has the fastest increase rate at the very beginning of the corrosion test, but its oxide film has the slowest growth rate as the corrosion proceeds. By contrast, the sample annealed at 500 °C shows the lowest weight gain but the highest corrosion rate constant. Such a corrosion behavior is attributed to the amount of defects existing in the oxide film formed on the annealed samples; fewer defects would provide a lower fraction of short-circuit diffusion in total diffusion, resulting in a lower diffusion coefficient of oxygen in the oxide film, thereby producing better corrosion resistance. This is consistent with the calculated diffusion coefficients of oxygen in the oxide films: 3.252 × 10<sup>−11</sup> cm<sup>2</sup>/s, 3.464 × 10<sup>−11</sup> cm<sup>2</sup>/s and 3.740 × 10<sup>−11</sup> cm<sup>2</sup>/s for the samples annealed at 400 °C, 450 °C, and 500 °C, respectively.https://www.mdpi.com/2075-4701/9/8/850Zirconium alloycorrosionoxidediffusion coefficientannealing |
| spellingShingle | Lina Zhang Liang-Yu Chen Cuihua Zhao Yujing Liu Lai-Chang Zhang Calculation of Oxygen Diffusion Coefficients in Oxide Films Formed on Low-Temperature Annealed Zr Alloys and Their Related Corrosion Behavior Metals Zirconium alloy corrosion oxide diffusion coefficient annealing |
| title | Calculation of Oxygen Diffusion Coefficients in Oxide Films Formed on Low-Temperature Annealed Zr Alloys and Their Related Corrosion Behavior |
| title_full | Calculation of Oxygen Diffusion Coefficients in Oxide Films Formed on Low-Temperature Annealed Zr Alloys and Their Related Corrosion Behavior |
| title_fullStr | Calculation of Oxygen Diffusion Coefficients in Oxide Films Formed on Low-Temperature Annealed Zr Alloys and Their Related Corrosion Behavior |
| title_full_unstemmed | Calculation of Oxygen Diffusion Coefficients in Oxide Films Formed on Low-Temperature Annealed Zr Alloys and Their Related Corrosion Behavior |
| title_short | Calculation of Oxygen Diffusion Coefficients in Oxide Films Formed on Low-Temperature Annealed Zr Alloys and Their Related Corrosion Behavior |
| title_sort | calculation of oxygen diffusion coefficients in oxide films formed on low temperature annealed zr alloys and their related corrosion behavior |
| topic | Zirconium alloy corrosion oxide diffusion coefficient annealing |
| url | https://www.mdpi.com/2075-4701/9/8/850 |
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