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| Formation Mechanism and Properties of Oxide Film on 310-ODS Steel in Supercritical Water |
| LU Hui,SHEN Zhao,ZHANG Lefu
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| (School of Nuclear Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract Abstract： The general corrosion susceptibility of 310ODS steel was evaluated in 600℃ supercritical deaerated water by weight gain. The sample periods were 100, 300, 600, 1 000, and 1 500 h. The surface oxide film of 310ODS steel was analyzed by using scanning electron microscope (SEM), energy disperse spectroscopy (EDS) and Xray diffractometer (XRD). The results show that a dense oxide film is formed on the surface of 310ODS steel during the early days (300 h) and the corrosion rate decreases rapidly. The oxide film is a doublelayer structure with a dense Crenriched inner layer and a porous Feenriched outer layer. The inner layer becomes uniform and the outer layer does not change with the immersing time. The oxidation process of 310-ODS steel in 600℃ supercritical deaerated water meets the solidstate growth mechanism and Y2O3 in the grain boundaries improves the corrosion resistance.
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Received: 12 March 2015
Published: 28 April 2016
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