摘要
为探清冻融循环过程对管线钢材在盐渍土环境中腐蚀的影响,通过室内模拟试验,采用电化学阻抗谱测试(EIS)技术和极化曲线测试手段研究了不同冻融循环次数下X70钢在NaCl污染砂体系中的电化学腐蚀行为。EIS测试结果表明:污染砂体系的阻抗值会随着冻融次数的增加而降低,降低的主要原因是冻融循环导致了体系电阻R_s及电荷转移电阻R_(ct)的降低;极化曲线测试结果表明线性极化电阻R_p随冻融循环次数的增加而降低。通过室内模拟试验可知污染砂体系的腐蚀性会随着冻融循环次数的增加而提高,即埋地管线在盐渍土中的使用寿命随着冻融循环次数的增加而降低。
In order to figure out the effect of freezing-thawing cycles on the corrosion behavior of pipeline steel in saline soil,the electrochemical corrosion behavior of X70 steel in NaCl contaminated sand under different freezing-thawing cycles was studied by laboratory experiment,EIS technology and polarization curve.The EIS results show that the system impedance will decrease with the increase of the number of freezing-thawing cycle and the main reason is the reduction of solution resistance R s and charge transfer resistance R ct caused by the freeze-thaw cycle;polarization curve results show that the polarization resistance R p increases linearly with the decrease of the number of freezing-thawing cycles,which means the the service life of buried pipelines in saline soil decreases with the increase of freeze-thaw cycles.
作者
陈杨
何斌
白晓红
CHEN Yang;HE Bin;BAI Xiao-hong(College of Architecture and Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《科学技术与工程》
北大核心
2018年第22期312-317,共6页
Science Technology and Engineering
基金
国家自然科学基金(51078253)
太原理工大学校青年基金(1205-020203)资助
关键词
污染土
管线钢
EIS
极化曲线
冻融循环
盐渍土
contaminated soil
pipeline steel
EIS
polarization curve
freezing-thawing cycle saline soil
