直流杂散电流对Q235钢在红壤中腐蚀行为的影响
Effect of DC Stray Current on Corrosion Behavior of Q235 Steel in Red Soil
刘欣 1何一鹏 2田旭 1贾蕗路 1裴锋 1刘光明 2张宇 1徐碧川1
作者信息
- 1. 国网江西省电力有限公司电力科学研究院, 南昌 330096
- 2. 南昌航空大学材料科学与工程学院, 南昌 330063
- 折叠
摘要
在模拟直流电流干扰下,研究了接地材料Q235钢在江西红壤环境中的对地电位变化规律以及腐蚀行为,采用扫描电镜、能谱仪和X射线衍射仪分析了试样表面腐蚀产物的形貌及组成,并将初始电位偏移量和稳定电位偏移量与失重法获得的腐蚀速率进行了拟合.结果表明:在不同电流密度的直流电流干扰下,阳极对地电位先下降后缓慢升高,最后趋于稳定;直流干扰下试样表面呈现局部腐蚀的特征,腐蚀产物分层、疏松且易脱落,其主要成分为Fe2O3、FeOOH;初始电位偏移量及稳定电位偏移量均与实测的腐蚀速率呈线性关系.试验条件下通过测量阳极对地电位可间接预测Q235钢接地材料的腐蚀速率.
Abstract
Under the interference of simulated DC current,the change law of potential to ground and corrosion behavior of grounding material Q235 steel in Jiangxi red soil environment were studied.The morphology and composition of corrosion products on the surface of the sample were analyzed by scanning electron microscope,energy dispersive spectrometer and X-ray diffractometer.The initial potential offset and stable potential offset were correlated with the corrosion rate obtained by weight loss method.The results show that under the DC current interference of different current densities,the anode-to-ground potential decreased first,then increased slowly,and finally tended to be stable.Under DC interference,the surface of the sample showed the characteristics of localized corrosion.The corrosion products were layered,loose and easy to fall off,and their main components were Fe2O3 and FeOOH.The initial potential offset and stable potential offset were linearly related to the measured corrosion rate.Under the experimental conditions,the corrosion rate of Q235 steel grounding material could be indirectly predicted by measuring the anode-to-ground potential.
关键词
红壤/Q235钢/杂散电流/腐蚀行为Key words
red soil/Q235 steel/stray current/corrosion behavior引用本文复制引用
出版年
2024
NETL
NSTL
万方数据