Abnormal Weight Gain Behavior of 304NG Stainless Steel in Supercritical Water

BAO Yi-chen; ZHANG Le-fu; ZHU Fa-wen; TANG Rui; QIAO Pei-peng

doi:10.7538/yzk.2010.44.09.1093

Atomic Energy Science and Technology > 2010 > 44(9): 1093-1098. > DOI: 10.7538/yzk.2010.44.09.1093

BAO Yi-chen, ZHANG Le-fu, ZHU Fa-wen, TANG Rui, QIAO Pei-peng. Abnormal Weight Gain Behavior of 304NG Stainless Steel in Supercritical Water[J]. Atomic Energy Science and Technology, 2010, 44(9): 1093-1098. DOI: 10.7538/yzk.2010.44.09.1093

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Abnormal Weight Gain Behavior of 304NG Stainless Steel in Supercritical Water

1.
School of Nuclear Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2.
Nuclear Power Institute of China, Chengdu 610041, China

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Received Date: December 31, 1899
Revised Date: December 31, 1899

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The corrosion behavior of 304NG stainless steel was investigated in supercritical water (SCW) at 550, 600 and 650 ℃. The SEM, EDS and XRD were used to analyze the corrosion morphology, structure and chemical composition of oxide film. The experiment results show that the oxidation of 304NG stainless steel approximately follows power function growth kinetics after exposure to supercritical water for 1 000 h, while the weight gain decreases drastically at 650 ℃. The possible mechanism of the anomalous temperature dependence of oxidation kinetics is ascribed to the rapid diffusion of Cr at higher temperature, maintaining protectiveness of oxide film on the sample surface, and finally resulting in the decrease of the nodular corrosions.
- 304NG stainless steel,
- supercritical water,
- oxide film,
- nodular corrosion

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Abnormal Weight Gain Behavior of 304NG Stainless Steel in Supercritical Water

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