磁场对航空拖缆碳钢材料腐蚀行为影响研究

Effect of Magnetic Field on Corrosion Behavior of Aerial Cable's Carbon Steel

目的鉴于航空拖缆海洋环境使用的实际需要以及海洋环境中磁场对腐蚀的影响,展开磁场对航空拖缆碳钢材料腐蚀行为影响的研究。方法分别运用线性极化、交流阻抗以及电化学噪声等试验方法研究施加磁场扰动下碳钢腐蚀速度变化以及腐蚀机理。结果施加磁场后,阴极氧去极化过程和中间产物的形成过程在碳钢不同腐蚀状态下分别占主导地位。当磁场强度较低时,阴极氧去极化被抑制,是腐蚀速度的控制步骤,电荷转移电阻增大,腐蚀速度减小。磁场强度逐渐增大,中间产物的形成和转化过程逐渐成为主导因素,噪声电阻增大,腐蚀速度减小。结论磁场对航空拖缆碳钢材料的腐蚀速度产生影响。

Objective The effect of magnetic field on corrosion behavior of aerial cable＇s carbon steel is researched, because aerial cable is used in the sea environment and magnetic field in ocean always effects corrosion. Methods The polarization, electrochemical impedance spectrum and electrochemical noise skills were employed to study variation of corrosion rate and mechanism of corrosion of the carbon steel in magnetic field. Results The experimental results showed that after adding the external magnetic field, the depolarization process of cathode oxygen and the formation process of the intermediate product took leading positions respectively under different corrosion status of carbon steel. When the magnetic field strength was low, the depolarization of cathode oxygen was inhibited. That was the control step of corrosion rate, resulting in decrease of the corrosion rate and increase of charge transfer resistance. When the magnetic field strength got stronger gradually, the formation and transformation of intermediate product gradually became a dominant factor. The noise resistance increased and the corrosion speed decreased. Conclusion The magnetic field has certain effect on the corrosion rate of aerial cable＇s carbon steel.