中华医学超声杂志

应用化学 ›› 2010, Vol. 27 ›› Issue (07): 836-841.DOI: 10.3724/SP.J.1095.2010.90692

• 研究论文 • 上一篇    下一篇

稀土Ce4+和香兰素在H3PO4介质中对钢的缓蚀协同效应

李向红1*,邓书端2,付惠1,木冠南3   

  1. (1.西南林学院基础部 昆明 650224；2.西南林学院木质科学与装饰工程学院 昆明;
    3.云南大学化学系 昆明)
  • 收稿日期:2009-10-20 修回日期:2009-12-29 出版日期:2010-07-10 发布日期:2010-07-10
  • 通讯作者: 李向红，男，副教授; E-mail:xianghong-li@163.com; 研究方向：金属的腐蚀与防护
  • 基金资助:
    西南林学院面上科研基金项目（200715M）

Synergistic Inhibition Effect of Rare Earth Ce4+ and Vanillin on the Corrosion of Cold Rolled Steel in H3PO4 Media

LI Xiang-Hong1*, DENG Shu-Duan2, FU Hui1, MU Guan-Nan3   

  1. (1.Department of Fundamental Courses,Southwest Forestry University,Kunming 650224;
    2.Faculty of Wood Science and Decoration Engineering,Southwest Forestry University,Kunming;
    3.Department of Chemistry,Yunnan University,Kunming)
  • Received:2009-10-20 Revised:2009-12-29 Published:2010-07-10 Online:2010-07-10

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摘要：

采用失重法、电化学法和紫外-可见吸收光谱研究了3.0 mol/L H3PO4介质中，稀土Ce4+和香兰素(4-羟基-3-甲氧基-苯甲醛)对冷轧钢的缓蚀协同效应。 结果表明，香兰素对冷轧钢有中等程度的缓蚀作用，缓蚀率随其浓度的增加而增大，最大缓蚀率为66%，在钢表面的吸附符合Freundlich吸附模型；稀土Ce4+对冷轧钢的缓蚀作用较差，最大缓蚀率仅为20%左右。 稀土Ce4+和香兰素复配后对冷轧钢产生了明显的缓蚀协同效应，最大缓蚀率可达90%。 稀土Ce4+和香兰素在H3PO4介质中复配后形成了新的配合物，为混合抑制型缓蚀剂。

关键词: 磷酸, 冷轧钢, 香兰素, 稀土, Ce4+, 缓蚀协同效应

Abstract:

The synergistic inhibition effect of rare earth Ce4+ and vanillin(4-hydroxy-3-methoxybenzaldehyde) on the corrosion of cold rolled steel(CRS) in 3.0 mol/L H3PO4 solution was studied by mass loss, potentiodynamic polarization and UV-Vis spectrophotometry(UV-Vis). The present study reveals that vanillin exhibits a moderate inhibitive effect on the corrosion of CRS. The inhibition efficiency(IE) increases with the concentration increase, and the maximum IE is 66%. The adsorption of vanillin on the CRS surface obeys Freundlich adsorption isotherm equation. Ce4+ shows a poor inhibition performance and the maximum IE is not more than 20%. However, incorporation of rare earth Ce4+ with vanillin significantly improves the inhibition performance and produces a synergistic inhibition effect. The maximum IE is as high as 90%. Ce4+ and vanillin form a new complex, which acts as a mixed-type inhibitor.

Key words: phosphoric acid, cold rolled steel, vanillin, rare earth, Ce4+, synergistic inhibition effect

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