物理化学学报 >> 2004, Vol. 20 >> Issue (06): 664-667.doi: 10.3866/PKU.WHXB20040623

研究简报 上一篇    下一篇

硫脲对块体纳米晶工业纯铁在盐酸溶液中的缓蚀行为

沈长斌;王胜刚;杨怀玉;龙康;王福会   

  1. 中国科学院金属研究所　金属腐蚀与防护国家重点实验室,沈阳　110015; 中国科学院国际材料物理中心,沈阳　110016;大连铁道学院材料科学与工程系,大连　116028
  • 收稿日期:2004-01-02 修回日期:2004-03-03 发布日期:2004-06-15
  • 通讯作者: 杨怀玉 E-mail:hyyang@icpm.syb.ac.cn

Corrosion Inhibition of Bulk Nanocrystallized Industrial Pure Iron by Thiourea in HCl

Shen Chang-Bin;Wang Sheng-Gang;Yang Huai-Yu;Long Kang;Wang Fu-Hui   

  1. State Key Laboratory for Corrosion and Protection of Metal, Institute of Metal Research, Chinese Academy of Sciences, Shenyang　110015;International Center for Materials Physics, Chinese Academy of Sciences, Shenyang　110016;Department of Materials Science and Engineering, Dalian Railway Institute, Dalian　116028
  • Received:2004-01-02 Revised:2004-03-03 Published:2004-06-15
  • Contact: Yang Huai-Yu E-mail:hyyang@icpm.syb.ac.cn

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摘要： 采用电化学阻抗谱(EIS)研究了硫脲对室温下1 mol•L－1盐酸溶液中粗晶和纳米晶工业纯铁的腐蚀行为的影响.从EIS的拟合结果得知,在1 mol•L－1盐酸溶液中,块体纳米晶工业纯铁比粗晶工业纯铁腐蚀倾向小.基于纳米晶和粗晶工业纯铁在添加有硫脲的1 mol•L－1盐酸溶液中阻抗谱随浸泡时间的变化关系,观察到以下现象,当浸泡时间短至5 min时,对应不同浓度(50、100、150、500 mg•L－1)的缓蚀剂添加量,在粗晶工业纯铁的阻抗复平面图上出现一感抗弧,而在纳米晶工业纯铁的阻抗复平面图是一圆心下偏的容抗弧.随着浸泡时间的延长,两种样品的容抗弧半径增大,在150 mg•L－1的浓度时,电荷传递电阻(Rct)出现极值,这表明硫脲是一种吸附型缓蚀剂.抗盐酸腐蚀性能的提高和没有感抗弧的出现, 归因于体纳米化的结果,这与体纳米化的制备技术密切相关.

关键词: 块体纳米晶工业纯铁, 硫脲, 缓蚀作用, 电化学阻抗谱(EIS), 盐酸溶液

Abstract: The effect of thiourea(TU) on the corrosion behavior of bulk nanocrystallized and coarse grain industrial pure iron in 1 mol•L－1 HCl at room temperature was investigated, by means of electrochemical impedance spectroscopy(EIS).Bulk nanocrystallized industrial pure iron is less prone to get corrosive than its coarse grain counterpart in blank 1 mol•L－1 HCl at room temperature from the EIS fitting results. On the basis of the variation of impedance behaviors of bulk nanocrystallized and coarse grain industrial pure iron in the inhibitor-containing 1 mol•L－1 HCl solutions with the immersion time, an relationship between immersion time and Nyquist plot was established, for very short immersion time,namely,5 min, an inductive loop appeared at different concentrations in the Nyquist plots of coarse industrial pure iron rod, but it did not appear in those of nanocrystallized industrial pure iron. A critical concentration of thiourea with the largest Rct (charge transfer resistance) in the complex impedance plane appeared for both samples.

Key words: Bulk nanocrystallized industrial pure iron, Thiourea, Inhibition, 　Electrochemical impedance spectroscopy (EIS), Hydrochloridic Solution