化学学报 ›› 2003, Vol. 61 ›› Issue (9): 1420-1424. 上一篇    下一篇

研究论文

钙作为合金元素对铝在碱溶液中的缓蚀作用及其与酒石酸盐的协同效应

邵海波;王建明;张昭;张鉴清;曹楚南   

  1. 浙江大学化学系
  • 发布日期:2003-09-15

Inhibition Effect of Calcium as an Alloy Element of Aluminum and Its Cooperative Effect with Tartrate in an Alkaline Solution

Shao Haibo;Wang Jianming;Zhang Zhao;Zhang Jianqing;Cao Chunan   

  1. Department of Chemistry, Zhejiang University
  • Published:2003-09-15

通过集气法、极化曲线和电化学阻抗谱研究了在铝中添加合金元素钙对其在碱 溶液中的缓蚀作用及其与酒石酸盐的协同效应。实验结果表明,铝电极的腐蚀速率 随钙含量的增加而减小。溶液中不含酒石酸盐时,钙对电极反应的阴极过程有显著 的抑制作用,对阳极过程作用不明显;而当溶液中含有酒石酸盐时,阴极过程和阳 极过程均被显著抑制。阻抗谱的解析结果还表明,钙离子或酒石酸钙络离子是通过 减小反应物在活性位上的反应速率而起缓蚀作用的,它们可能属于界面型缓蚀剂而 非成相型缓蚀剂。

关键词: 铝, 钙, 酒石酸, 缓蚀剂, 协同效应, 阻抗

The inhibition effect of calcium as an alloy element of aluminum and its cooperative effect with taitrate in an alkaline solution were systematically investigated by hydrogen collection, polarization curve and EIS. The experimental results show that the corrosion rate decreases with the increase of calcium content. When the electrolyte contains no tartrate, the inhibition effect of calcium on the cathodic process is much stronger than that on the anodic process. However, when the electrolyte contains tartrate (0.05 mol·L~(-1)), both the anodic and cathodic process is greatly inhibited. The analysis on the EIS reveals that the calcium ion or calcium tartrate complex ion takes its effect by reducing the reaction rates on the active sites, which indicates that they probably belong to interface inhibitor rather than interphase one.

Key words: ALUMINIUM, CALCIUM, TARTARIC ACID, CORROSION INHIBITORS, COOPERATIVITY, IMPEDANCE

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