Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (10): 1213-1220.DOI: 10.6023/A1111082 Previous Articles     Next Articles

Full Papers

不同晶粒度螺纹钢的电化学行为及其钝化膜的Mott-Schottky 研究

罗检, 王毅, 蒋继波, 钟庆东, 朱振宇, 张磊   

  1. 上海大学上海市现代冶金与材料制备重点实验室 上海 200072
  • 投稿日期:2011-11-08 修回日期:2012-03-05 发布日期:2012-05-16
  • 通讯作者: 钟庆东
  • 基金资助:

    国家自然科学基金(Nos. 50571059, 50615024)、教育部新世纪优秀人才支持计划(No. NCET-07-0536)及教育部创新团队计划(No. IRT0739)资助项目.

Electrochemistry Behavior of Rebars with Different Grain Size and Mott-Schottky Research of Passive Films

Luo Jian, Wang Yi, Jiang Jibo, Zhong Qingdong, Zhu Zhenyu, Zhang Lei   

  1. Key Laboratory of Modern Metallurgy and Material Processing of Shanghai, Shanghai University, Shanghai 200072
  • Received:2011-11-08 Revised:2012-03-05 Published:2012-05-16
  • Supported by:

    Project was supported by the National Natural Science Foundation of China (Nos. 50571059, 50615024), the Program for New Century Excellent Talents in University of Ministry of Education of China (No. NCET-07-0536) and the Program for Innovaltive Research Team in University of Ministry of Education of China (No. IRT0739).

The effect of grain size on the electrochemistry behavior of rebars in 3.5% NaCl solution were investigated using electrochemical impedance spectroscopy (EIS) and polarization curves. The Mott-Schottky curves at different potentials were employed to compared the passive film formed on the rebars with different grain size. The results showed that fine-grained rebars had larger impedance value and less corrosion current density than coarse-grained rebars after immersed 14 d, and the corrosion resistance of fine-grained rebar was better. The passive film formed in borate buffer solution behaviored like a classical n-type semiconductor, and the passive ranges of the rebars were all between -0.15 and 0.8 V. The stability and corrosion resistance of the passive film formed on fine-grained rebars were worse than those of coarse-grained rebars at the potential of -0.1, 0.2 and 0.5 V. The subcoat of the film vanished at the potential of 0.5 V. The donor densities was minimum, and the film was most compact and stable.

Key words: corrosion resisting, grain size, rebar, Mott-Schottky