石油化工高等学校学报

石油化工高等学校学报 ›› 2008, Vol. 21 ›› Issue (2): 1-5.

• 石油化工 •    下一篇

X80和X70管线钢在NaHCO3溶液中钝化膜的电化学性能

梁 平1,2, 李晓刚1, 杜翠薇1, 陈 旭1, 刘智勇1   

  1. 1.北京科技大学材料科学与工程学院,北京100083; 2.辽宁石油化工大学机械工程学院,辽宁抚顺113001
  • 收稿日期:2007-09-02 出版日期:2008-06-20 发布日期:2017-06-28
  • 作者简介:梁平(1974-),男,辽宁沈阳市,讲师,博士研究生。
  • 基金资助:
    国家“十一五”科技支撑计划项目(2006BAK02
    B01);国家科技基础条件平台建设项目资助
    (2005DKA10400)。

Electrochemical Characterisation of Passive Films Formed on X80 and X70 Pipeline Steels in NaHCO3

LIANG Ping1,2, LI Xiao-gang1, DU Cui-wei1, CHEN Xu1, LIU Zhi-yong1   

  1.  
    1.Materials Science and Engineering School，University of Science and Technology Beijing，Beijing 100083，P.R.China;
    2. School of Mechanical Engineering, Liaoning University of Petroleum & Chemical Technology, Fushun Liaoning 113001,P.R.China
  • Received:2007-09-02 Published:2008-06-20 Online:2017-06-28

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摘要： 采用动电位极化、交流阻抗和电容测量等方法研究了X80和X70管线钢在0.5mol/LNaHCO3 溶液
中的活化-钝化行为及生成的钝化膜的电化学性能。极化曲线表明,X80和X70钢在-0.16 ~ 0.90V 发生了钝
化,X70钢的维钝电流密度(ip)约为18.38μA/cm2,而X80钢的维钝电流密度约为6.76μA/cm 2。交流阻抗表明,
X80钢表面生成的钝化膜比X70钢的更加致密,均匀性更好,与原子力显微镜(AFM)的观察结果相吻合。电容测量
表明,X80和X70钢在该溶液中表面生成的钝化膜在-0.20~0.80V为n型半导体,且X80钢比X70钢表面钝化膜
的施主密度更低,空间电荷层更厚,耐蚀性更好。

关键词: X80管线钢   , 钝化膜  ,  Mott-Schottky曲线  ,   , 耐蚀性

Abstract: The passive behavior and electrochemical characterization of the passive films formed on X80 and X70 pipeline steels in 0.5 mol/L NaHCO3 solution were discussed by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and capacitance measurements. It is show that X80 and X70 pipeline steels present a wide passive anodic region (-0.16~0.90 V), the passive current density (ip) of X80 and X70 steels are 6.76 μA/cm2 and 18.38 μA/cm2, respectively. EIS results indicate that the surface of the passive film formed on X80 steel is much denser and uniformer than that of X70, and the result is also show by AFM. Mott-Schottky analyses displayed that the passive films on X80 and X70 pipeline steels in 0.5 mol/L NaHCO3 exhibit n-type semiconductive characters in the potential region of -0.20 V to 0.80 V. Compared with the passive film of X70 steel, the donor density is much lower and the width of space charge layer is thicker for the passive film of X80 steel, so the corrosion resistance of the latter is better.

Key words: X80 pipeline steel   ,   , Passive films  ,   ,  Mott-Schottky plots  ,  ,  Corrosion resistance

引用本文

梁 平, 李晓刚, 杜翠薇, 陈 旭, 刘智勇. X80和X70管线钢在NaHCO3溶液中钝化膜的电化学性能[J]. 石油化工高等学校学报, 2008, 21(2): 1-5.

LIANG Ping, LI Xiao-gang, DU Cui-wei, CHEN Xu, LIU Zhi-yong. Electrochemical Characterisation of Passive Films Formed on X80 and X70 Pipeline Steels in NaHCO3[J]. Journal of Petrochemical Universities, 2008, 21(2): 1-5.

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