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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。
The electrochemical corrosion behavior of Q235 steel in simulated groundwater solutions of Beishan area and simulated deep geological disposal of nuclear waste was investigated by using open circuit potential, electrochemical impedance technique and potentiodynamic polarization curve test. The results show that the corrosion rate of Q235 steel in groundwater environment is higher than that of high-pressure bentonite, and the maximum corrosion rate appears in the range of 70-90 ℃. In simulated deep geological disposal of nuclear waste, the corrosion rate of Q235 steel in high-pressure solid bentonite with 20% water content is significantly higher than that of other water-cut conditions, which are both saturated and unsaturated The water condition of the junction. Among them, the high moisture content bentonite environment and the diffusion of cathode oxygen are the main limiting factors of corrosion. However, the conductivity is the main factor that determines the corrosion rate for high pressure bentonite with low water content.