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对氯盐污染混凝土进行电化学除盐时阴极附近产生的气体进行收集与分析,研究了电化学除盐时钢筋表面发生的电极反应。结果表明:在电化学除盐前期钢筋表面析氢和耗氧反应同时存在,在氧气消耗到一定程度后,电极反应主要为析氢反应。析氢反应主要取决于电流密度,氢气的生成常数kH2与电流密度I存在线性关系kH2=5.36×10–8I–1.99×10–8;耗氧反应则在除盐早期决定于电流密度,而后期则取决于O2扩散到混凝土表面的速率。
The gases generated near the cathode during electrochemical desalination of chlorine-contaminated concrete were collected and analyzed, and the electrode reactions on the surface of the steel bar during electrochemical desalting were studied. The results showed that the hydrogen evolution reaction and oxygen consumption reaction existed on the surface of steel bar before electrochemical desalting. After oxygen consumption reached a certain level, the electrode reaction was mainly hydrogen evolution reaction. Hydrogen evolution reaction mainly depends on the current density, hydrogen generation constant kH2 and current density I exists a linear relationship kH2 = 5.36 × 10-8I-1.99 × 10-8; oxygen consumption reaction in the early desalination depends on the current density, and then Depends on the rate of diffusion of O2 to the concrete surface.