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基于宏电池腐蚀理论,将阴极区钢筋和阳极区钢筋分别浇筑成两个独立的砂浆试块,并用导线将其连接成循环电路,通过断开和连接电路来控制钢筋的微电池腐蚀和宏电池腐蚀,再将不同浓度的NO_2~-溶液分别添加到阴极试块和阳极试块中以模拟其渗透过程,通过比较NO_2~-作用前后阴阳极钢筋之间宏电池腐蚀电流的大小,来评价阴阳极钢筋表面NO_2~-的不均匀性对钢筋宏电池腐蚀行为的影响。结果表明:当NO_2~-作用于处于腐蚀状态的阳极钢筋时,能够增加阳极钢筋的极化阻抗,减少阴阳极钢筋间的宏电池腐蚀电位差,降低宏电池腐蚀电流,从而有效抑制宏电池腐蚀;当NO_2~-主要作用于处于腐蚀状态的阴极钢筋时,阴阳极钢筋间的宏电池电位差的增大易使宏电池腐蚀电流增加,存在加速钢筋宏电池腐蚀的危险。
Based on the macro-cell corrosion theory, the reinforcement in the cathode zone and the reinforcement in the anode zone are respectively cast into two independent mortar test blocks, and connected by wires into a circulating circuit. The micro-cell corrosion and macro-cell corrosion of the reinforcing bars are controlled by disconnecting and connecting circuits , And then different concentrations of NO_2 ~ - solution were added to the cathode test block and the anode test block to simulate the infiltration process, by comparing the size of the macro-cell corrosion current between anode and cathode before and after NO_2 ~ - to evaluate the anode Effect of Unevenness of NO_2 ~ on Steel Bar Surface Corrosion of Macro Bars. The results show that when NO_2 ~ - acts on the corrosion of the anode reinforcement, it can increase the polarization resistance of the anode reinforcement, reduce the corrosion potential difference of the macro battery between the anode and the cathode, and reduce the corrosion current of the macro battery, so as to effectively inhibit the macro cell corrosion ; When NO_2 ~ - mainly acts on the corrosion of the cathode steel, the macro battery potential difference between the anode and the cathode tends to increase the corrosion current of the macro battery, there is the risk of accelerating the macro battery corrosion.