中文摘要：

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。

英文摘要：

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 between70 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.