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材料研究学报  2008, Vol. 22 Issue (6): 611-614    
  研究论文 本期目录 | 过刊浏览 |
在稀硫酸中添加硫脲对块体纳米晶纯铁腐蚀行为的影响
沈长斌1†;杨怀玉2;王胜刚3;龙康2;王福会2
1.大连交通大学材料科学与工程学院 大连 116028
2.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 116016
3.中国科学院金属研究所沈阳材料科学国家(联合)实验室 沈阳 116016
Effect of thiourea on bulk nanocrystallized ingot iron in acidic sulfate solution
 SHEN Changbin1†; YANG Huaiyu2; WANG Shenggang3; LONG Kang2; WANG Fuhui2
1.School of Materials Science & Engineering; Dalian Jiaotong University; Dalian 116028
2. State Key Laboratory for Corrosion and Protection of Metal; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
3.Shenyang National Laboratory for Materials Sciences;Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
引用本文:

沈长斌 杨怀玉 王胜刚 龙康 王福会. 在稀硫酸中添加硫脲对块体纳米晶纯铁腐蚀行为的影响[J]. 材料研究学报, 2008, 22(6): 611-614.
, , , , . Effect of thiourea on bulk nanocrystallized ingot iron in acidic sulfate solution[J]. Chin J Mater Res, 2008, 22(6): 611-614.

全文: PDF(756 KB)  
摘要: 

研究了在稀硫酸溶液中添加硫脲(TU)对块体纳米晶工业纯铁(BNII)室温电化学腐蚀行为的影响,并与普通工业纯铁(CPII)的室温电化学腐蚀行为进行了比较. 结果表明:将CPII在添加TU的稀硫酸溶液中浸泡5 min,其电化学阻抗(EIS)谱图中出现感抗弧.随着浸泡时间的延长, CPII的EIS谱图表现为一非圆心下偏的半圆; 而在相同的条件下,BNII的EIS谱图表现为两个时间常数的容抗弧, 表明硫脲对其腐蚀行为有促进作用.动电位极化(PDP)测试结果表明, 两种材料的样品均出现阳极脱附现象.

关键词 材料失效与保护 块体纳米晶工业纯铁(BNII) 硫脲(TU) 脱附现象    
Abstract

Effect of thiourea in acidic sulfate solution on electrochemical corrosion behavior of bulk nanocrystallized ingot iron (BNII) was investigated in 0.1 M H2SO4 + 0.25 M Na2SO4 solution at room temperature by electrochemical impedance spectra (EIS) and potentiodynamic polarization method (PDP), compared to that of coarse polycrystalline ingot iron (CPII). The results show that For CPII, an inductive loop appears in the Nyquist plots after 5 minutes, immersion. With the increase of immersion time, the Nyquist plot of CPII is not a perfect semicircle; the Nyquist plots of BNII contain two capacitive loops with two time constants. The inhibition of thiourea to BNII is very limited. However, thiourea promoted the dissolution of BNII. The polarization curves for both samples show the presence of a desorption potential. When the potential is higher than the desorption potential, the anodic dissolution current increases very abruptly.

Key wordsmaterials failure and protection    bulk nanocrystallized ingot iron(BNII)    thiourea(TU)    desorption
收稿日期: 2008-02-26     
ZTFLH: 

TB304

 
基金资助:

国家自然科学基金(50501023)

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