Q235钢在甘肃北山地区地下水模拟液及高压实膨润土环境下的腐蚀行为

doi:10.11902/1005.4537.2015.216

中国腐蚀与防护学报

2016, Vol. 36

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

本期目录 | 过刊浏览

Q235钢在甘肃北山地区地下水模拟液及高压实膨润土环境下的腐蚀行为

郑珉^1,²,黄彦良¹(

),西方笃³,路东柱¹,张杰¹,王秀通¹,温娟⁴,李玉红⁴,刘月妙⁵

1. 中国科学院海洋研究所青岛 266071
2. 中国科学院大学北京 100049
3. 东京工业大学东京 1528552
4. 兰州大学核科学与技术学院兰州 730000
5. 核工业北京地质研究院北京 100029

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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摘要:

采用开路电位、电化学阻抗技术以及动电位极化曲线测试的方法,研究了Q235钢在北山地区地下水模拟溶液以及模拟的核废料深地质处置环境中的电化学腐蚀行为。结果表明,Q235钢在地下水环境中的腐蚀速率高于高压实膨润土环境中的腐蚀速率,且其腐蚀速率最大值出现在70~90 ℃区间。在模拟的核废料深地质处置环境下,Q235钢在含水率为20%的高压实膨润土中的腐蚀速率显著高于其他含水率条件,该含水率是高压实膨润土饱和与非饱和两种水分状况的交界。其中高含水率的高压实膨润土环境,阴极氧气的扩散是腐蚀的主要限制因素;而对于低含水率的高压实膨润土环境,电导率是决定腐蚀速率的主要因素。

关键词 ： Q235钢, 地下水模拟液, 核废料深地质处置环境, 腐蚀

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

基金资助:国家自然科学基金项目 (51471160) 资助

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	刘月妙
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引用本文:

郑珉,黄彦良,西方笃,路东柱,张杰,王秀通,温娟,李玉红,刘月妙. Q235钢在甘肃北山地区地下水模拟液及高压实膨润土环境下的腐蚀行为[J]. 中国腐蚀与防护学报, 2016, 36(5): 398-406.
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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.216 或 https://www.jcscp.org/CN/Y2016/V36/I5/398

图1 高压实膨润土制备及电化学测试装置示意图

图2 Q235钢试样在不同温度地下水模拟液中的开路电位

图3 Q235钢试样在不同含水率的高压实膨润土中开路电位随温度的变化

图4 Q235钢试样梯度升温过程中在不同含水率的高压实膨润土中平均开路电位随温度的变化

图5 Q235钢试样在模拟地下水溶液中不同温度下的EIS

图6 Q235钢在模拟地下水溶液中不同温度下的等效电路

表1 Q235钢在模拟地下水溶液中不同温度下的EIS拟合电化学参数

图7 Q235钢在不同含水率的高压实膨润土中不同温度下的EIS谱

图8 Q235钢在地下水模拟溶液中不同温度下的动电位极化曲线

图9 Q235钢试样在不同含水率的高压实膨润土中不同温度下的动电位极化曲线

图10 Q235钢在地下水模拟溶液及不同含水率高压实膨润土中腐蚀电流密度随温度的变化曲线

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