交流电频率对X80管线钢在酸性土壤模拟溶液中腐蚀行为的影响

通过电化学测试、浸泡实验和表面分析技术研究了交流电频率(50~400 Hz)对X80钢在鹰潭酸性土壤模拟溶液中腐蚀行为的影响。结果表明,随交流电频率的增加,X80钢的腐蚀速率逐渐减小,腐蚀程度减弱。交流电作用下X80钢生成的腐蚀产物疏松、裂纹多,对基体的保护性很差。X80钢的腐蚀电位偏移量随交流电频率的增大而减小。随交流电频率的增大,阴、阳极极化曲线的振荡幅度逐渐减弱。交流电的施加不仅使阴、阳极的电流密度增大,还使阴极反应由混合控制逐渐向活化控制转变。

Effects of Alternating Current (AC) Frequency on Corrosion Behavior of X80 Pipeline Steel in a Simulated Acid Soil Solution

The effect of frequency of the applied alternating current (AC) on corrosion behavior of X80 steel in an artificial liquid aiming to simulate the acid soil medium of Yingtan area was studied by means of electrochemical measurement, immersion test and surface characterization technique. The results showed that with the increasing AC frequency, the corrosion rate and the corrosion degree of X80 steel decreased gradually. The corrosion product of X80 steel under the applied AC was loose with many cracks thus could not offer proper protection to the substrate. The offset of corrosion potential of X80 steel decreased as the AC frequency increases. With the increase of AC frequency, the oscillation amplitude of anode and cathode polarization curve gradually receded. In the range of the test frequency, the applied AC to X80 steel not only induced the increase of the current density for both anode and cathode, but also the change of cathode reaction from mixing control to activation control.