Q235钢在污染土壤中的氧浓差宏电池腐蚀

Macrocell Corrosion of Q235 Steel in Polluted Soils due to the Difference of Oxygen Concentration

利用失重法、电化学阻抗测试等方法,研究了Q235钢在污染土壤中的氧浓差宏电池腐蚀行为。实验结果表明,砂土中Q235钢为宏电池的阴极,粘土中Q235钢为阳极。随着实验时间的增加,粘土中Q235钢自然腐蚀速率逐渐减小,而粘土中作为宏电池阳极的Q235一直保持着较高的腐蚀速率。粘土中宏电池阳极的腐蚀速率为自然腐蚀速率的2.15倍。在粘土宏电池中阴阳极面积比15:1情况下,阳极的腐蚀速率较阴阳极面积比1:1时增加了近1倍。

The macrocell corrosion of Q235 steel in polluted soils due to the difference of oxygen concentration was studied using weight loss and electrochemical impedance spectroscopy （EIS）. It was found that Q235 steel in clay was an anode and in sand was a cathode when Q235 steel formed a macrocell between clay and sand. Along with test going, the corrosion rate of Q235 steel, which was buried in clay by natural style, became slow, but the anode of macrocell in clay kept a rapid corrosion rate. The corrosion rate of anode in clay was 2. 15 times of that in natural condition. When the area ratio of cathode to anode being 15 ： 1, the corrosion ratio of anode in clay was nearly 2 times of that in condition of the area ratio of cathode to anode being 1 ： 1.