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Effect of Zn(CH3COO)2 Addition on Corrosion of ZIRLO Alloy in Simulated PWR Primary Loop Medium with LiOH and H3BO3 |
YANG Mingxin(), GAO Yang, WANG Hui |
China Institute of Atomic Energy, Beijing 102413, China |
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Abstract Zn(CH3COO)2 injection in PWR primary loop can slow down the corrosion of structural materials. During the running time of PWR, the water-side corrosion of Zr-based alloy, as fuel element cladding material,may result in significant hydrogen uptake, embrittlement and cracking etc. of the Zr-based alloy, and finally the invalidation of cladding material. In this study, the corrosion behavior of ZIRLO alloy was assessed in LiOH and H3BO3 containing aqueous solution at 360 ℃/18.6 MPa with addition of 50 μg/kg Zn(CH3COO)2 via an autoclave test set, as well as weight change measurement, metalloscopy, XPS and TEM with EDS. The results show that the Zn(CH3COO)2 addition has no significant effect on the weight gain and scale thickness, while the type, valence state and distribution of elements in the formed oxide scale of the tested ZIRLO alloy, but can remarkably reduce the Fe content of the deposits on top of the formed oxide scale, and correspondingly restrain the hydrogen absorption of the ZIRLO alloy.
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Received: 27 November 2018
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Corresponding Authors:
YANG Mingxin
E-mail: yangmx_92@163.com
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