Corrosion Behavior of Q235 Steel in Simulated Underground Water and Highly Compacted Bentonite Environment of Beishan Area

doi:10.11902/1005.4537.2015.216

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (5): 398-406 DOI: 10.11902/1005.4537.2015.216

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Corrosion Behavior of Q235 Steel in Simulated Underground Water and Highly Compacted Bentonite Environment of Beishan Area

Min ZHENG^1,²,Yanliang HUANG¹(

),Du XIFANG³,Dongzhu LU¹,Jie ZHANG¹,Xiutong WANG¹,Juan WEN⁴,Yuhong LI⁴,Yuemiao LIU⁵

1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Tokyo Institute of Technology, Tokyo 1528552, Japan
4. The School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
5. Beijing Research Institute of Uranium Geology, Beijing 100029, China

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Abstract

The corrosion behavior of Q235 steel in an artificial solution to simulate the underground water and a highly compacted bentonite with different water contents to simulate the deep geological disposal environment at Beishan area, as a candidate site for nuclear waste storage, was respectively investigated by open circuit current measurement, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization test. The results indicated that the simulated underground water is more aggressive than the highly compacted bentonite with different water contents, which presents a high corrosion rate of Q235 steel with the maximum at the temperature between 70 and 90 ℃. While, the corrosion rate of Q235 in highly compacted bentonite with 20% water content shows the highest corrosion rate among others, whilst the 20% water content can be conformed as the border of saturated and unsaturated water status for the highly compacted bentonite. Moreover, the study showed that the oxygen diffusion is the limitation for cathodic reaction, so that the further corrosion in the highly compacted benonite with high water contents, while conductivity is the limitation in those with low water contents.

Key words: Q235 steel simulated underground water solution deep geological disposal environment corrosion

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	Articles by authors
	Min ZHENG
	Yanliang HUANG
	Du XIFANG
	Dongzhu LU
	Jie ZHANG
	Xiutong WANG
	Juan WEN
	Yuhong LI
	Yuemiao LIU

Cite this article:

Min ZHENG,Yanliang HUANG,Du XIFANG,Dongzhu LU,Jie ZHANG,Xiutong WANG,Juan WEN,Yuhong LI,Yuemiao LIU. Corrosion Behavior of Q235 Steel in Simulated Underground Water and Highly Compacted Bentonite Environment of Beishan Area. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 398-406.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.216 OR https://www.jcscp.org/EN/Y2016/V36/I5/398

Fig.1 Schematic diagram of the apparatus for highly compacted bentonite preparation and electrochemical measurement

Fig.2 OCP of Q235 steel in simulated underground water at different temperatures

Fig.3 OCP variations of Q235 steel with temperature in highly compacted bentonite with 30% (saturated) (a) and 25% (b) water

Fig.4 Average OCP variations of Q235 steel with gradient temperature increase in highly compacted bentonite with different contents of water

Fig.5 Nyquist (a) and Bode (b) plots of Q235 steel in simulated underground water solution at different temperatures

Fig.6 Equivalent circuits of Q235 steel in simulated underground water solution at 5~25 ℃ and 60~98 ℃ (a) and 45 ℃ (b)

Table 1 Fitting results of EIS of Q235 steel in simulated underground water solution at different temperatures

Fig.7 EIS plots of Q235 steel at different temperatures in highly compacted bentonite with 30% (saturated) (a), 20% (b) and10% (c) water

Fig.8 Tafel polarization curves of Q235 steel in simulated underground water solution

Fig.9 Tafel polarization curves of Q235 steel at different temperatures in highly compacted bentonite with 30% (saturated) (a), 20% (b) and 10% (c) water

Fig.10 Corrosion current density of Q235 steel in simulated underground water solution (a) and highly compacted bentonite with different contents of water (b) at different temperatures

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