含氯混凝土中钢筋宏电池腐蚀的研究

Study on the Macro-Cell Corrosion of Steel in Concrete Containing Chloride

为了确定含氯混凝土中钢筋的宏电池腐蚀的特性 ,研究了钢筋腐蚀速度与混凝土电阻间的关系。在宏电池阴阳极之间串联可变电阻来模拟混凝土电阻的变化。实验结果显示钢筋腐蚀反应的自然腐蚀电位主要为阳极反应决定 ,而腐蚀反应速度为阴极反应控制。混凝土电阻对钢筋腐蚀反应速度影响很大。

The relationship of the corrosion rate of steel and the resistance of concrete was studied to characterize the macrocell corrosion of reinforcement in the concrete containing chloride. A changeable resistance was linked in series between the anion and cathode of the macrocell to simulate the change of the concrete resistance. The results show that the corrosion potential of reinforcement was mainly determined by the anion reaction and the corrosion rate was controlled by the cathode reaction. There is superior influence of the concrete resistance upon the corrosion rate of reinforcement.