管线钢在鹰潭红壤泥浆中的腐蚀行为

摘要

Corrosion of X80 pipeline steel in a red soil slurry was investigated by electrochemical impedance spectroscopy (EIS), polarization technique and morphology observation. The results show that EIS of X80 steel in the red soil consists of a soil capacitive arc at the high-frequency region and a capacitive arc from the interface process in the low-frequency region. The electrode process was controlled by diffusion process after 30 d exposure. Fe oxides in the soil improve the corrosion process of the steel and a mechanism was proposed.%通过室内土壤埋藏实验，采用电化学阻抗谱(EIS)、电化学极化以及微观形貌观察等手段研究了X80钢在水饱和红壤泥浆中的腐蚀行为。试验结果表明，管线钢在红壤中的EIS谱具有两个时间常数特征；高频端呈现容抗弧，并提出了EIS解析方法。实验30天后，由于红壤泥浆的低电导率，电极反应过程主要受扩散控制。红壤泥浆的腐蚀性可能与红壤中氧化铁有关。