Field corrosion characterization of soil corrosion of X70 pipeline steel in a red clay soil  

作　　者：Shengrong Wang Cuiwei Du Xiaogang Li Zhiyong Liu Min Zhu Dawei Zhang 

机构地区：[1]Corrosion and Protection Center, Key Lab of Minstry of Education, University of Science and Technology Beijing

出　　处：《Progress in Natural Science:Materials International》2015年第3期242-250,共9页自然科学进展·国际材料（英文版）

基　　金：funded by National Nature Science Foundation of China (No. 51371036, 51131001, and 51471034);Beijing Higher Education Young Elite Teacher Project

摘　　要：The corrosion behavior of X70 pipeline steel buried in red soil environment has been studied. The surface morphology and elemental distribution were determined by scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS), and X-ray diffraction(XRD).The corrosion kinetics was evaluated by weight loss measurement. The results show that in red soil, the corrosion rate of X70 steel decreases with time, and follows the exponential decay law. General corrosion with non-uniform and localized pitting occurred on the steel surface. α-Fe OOH was the dominate products during corrosion in whole buried periods, and the corrosion products exhibited well protective properties. The potentiodynamic polarization tests revealed that icorrdecreased with time, indicating the improvement of corrosion resistance. The results of Electrochemical impendence spectroscopy(EIS) are consistent with potentiodynamic polarization tests.The corrosion behavior of X70 pipeline steel buried in red soil environment has been studied. The surface morphology and elemental distribution were determined by scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS), and X-ray diffraction(XRD).The corrosion kinetics was evaluated by weight loss measurement. The results show that in red soil, the corrosion rate of X70 steel decreases with time, and follows the exponential decay law. General corrosion with non-uniform and localized pitting occurred on the steel surface. α-Fe OOH was the dominate products during corrosion in whole buried periods, and the corrosion products exhibited well protective properties. The potentiodynamic polarization tests revealed that icorrdecreased with time, indicating the improvement of corrosion resistance. The results of Electrochemical impendence spectroscopy(EIS) are consistent with potentiodynamic polarization tests.

关 键 词：X70 steel SOIL CORROSION CORROSION KINETICS NON-UNIFORM CORROSION PITTING CORROSION 

分 类 号：TG172.4[金属学及工艺—金属表面处理]