Effect of Zn(CH3COO)2 Addition on Corrosion of ZIRLO Alloy in Simulated PWR Primary Loop Medium with LiOH and H3BO3

doi:10.11902/1005.4537.2018.179

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (2): 199-204 DOI: 10.11902/1005.4537.2018.179

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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.

Key words: ZIRLO alloy water-side corrosion second-phase particle Zn(CH₃COO)₂

Received: 27 November 2018

ZTFLH:

TG172.82

Corresponding Authors: YANG Mingxin E-mail: yangmx_92@163.com

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YANG Mingxin, GAO Yang, WANG Hui. Effect of Zn(CH₃COO)₂ Addition on Corrosion of ZIRLO Alloy in Simulated PWR Primary Loop Medium with LiOH and H₃BO₃. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 199-204.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2018.179 OR https://www.jcscp.org/EN/Y2020/V40/I2/199

Fig.1 Mass gains of ZIRLO alloy during corrosion in water containing LiOH and H₃BO₃ at 360 ℃ under 18.6 MPa

Fig.2 Distributions of hydride in ZIRLO alloy after corrosion at 360 ℃ under 18.6 MPa in LiOH and H₃BO₃solutions without Zn²⁺ (a) and with 50 μg/kg Zn²⁺ (b)

Table 1 Hydride contents of ZIRLO alloy after corrosion for different time at 360 ℃ under 18.6 MPa in LiOH and H₃BO₃solutions without and with 50 μg/kg Zn²⁺

Fig.3 TEM images of oxide scales formed on ZIRLO alloy after corrosion at 360 ℃ under 18.6 MPa in LiOH and H₃BO₃solutions without Zn²⁺ (a) and with 50 μg/kg Zn²⁺ (b)

Fig.4 TEM images (a, c) and EDS results (b, d) of the second phases in the oxide scales formed on ZIRLO alloy after corrosion at 360 ℃ under 18.6 MPa in LiOH and H₃BO₃solutions without Zn²⁺ (a, b) and with 50 μg/kg Zn²⁺ (c, d)

Fig.5 XPS fine peaks of O in the oxide scales of ZIRLO alloy after corrosion in the solutions without Zn²⁺ (a) and with 50 μg/kg Zn²⁺ (b)

Fig.6 XPS fine peaks of Zr in the oxide scales of ZIRLO alloy after corrosion in the solutions without Zn²⁺ (a) and with 50 μg/kg Zn²⁺ (b)

Fig.7 XPS fine peaks of Fe in the oxide scales of ZIRLO alloy after corrosion in the solutions without Zn²⁺ (a, b) and with 50 μg/kg Zn²⁺ (c, d) and the distance of 50 nm (a, c) and 100 nm (b, d)

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