物理化学学报 >> 2006, Vol. 22 >> Issue (03): 312-315.doi: 10.3866/PKU.WHXB20060311

研究论文 上一篇    下一篇

碱土金属离子与EDTA对纯铝在碱性溶液中的协同缓蚀作用

邵海波; 王晓艳; 王建明; 王俊波; 张鉴清; 曹楚南   

  1. 浙江大学化学系, 杭州 310027; 中国科学院金属研究所腐蚀与防护国家重点实验室, 沈阳 110015
  • 收稿日期:2005-09-01 修回日期:2005-10-24 发布日期:2006-03-10
  • 通讯作者: 邵海波 E-mail:dhx318@zjuem.zju.edu.cn

The Cooperative Inhibition Effects of Alkaline Earth Metal Ions and EDTA on the Corrosion of Pure Aluminum in an Alkaline Solution

SHAO Hai-Bo; WANG Xiao-Yan; WANG Jian-Ming; WANG Jun-Bo; ZHANG Jian-Qing; CAO Chu-Nan   

  1. Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China; State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, P. R. China
  • Received:2005-09-01 Revised:2005-10-24 Published:2006-03-10
  • Contact: SHAO Hai-Bo E-mail:dhx318@zjuem.zju.edu.cn

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摘要： 通过集气实验、极化曲线和电化学阻抗谱等方法研究了碱土金属离子与乙二胺四乙酸(EDTA)对纯铝在4 mol•L-1 KOH溶液中的协同缓蚀作用. 实验结果表明铝在含0.02 mol•L-1 EDTA和饱和Ca(OH)2、Sr(OH)2的溶液中具有最小的腐蚀速率. EDAX分析表明碱土金属离子和EDTA没有参与到铝表面氧化膜的组成中, 说明缓蚀剂是通过吸附在铝表面起作用的, 这表明它们是界面型缓蚀剂而非相间型缓蚀剂.

关键词: 纯铝, 碱性溶液, 腐蚀, 碱土金属, EDTA, 缓蚀剂

Abstract: The cooperative effects of alkaline earth metal ions and EDTA(ethylenediamine tetraacetic acid) on the corrosion inhibition of pure aluminum in 4 mol•L-1 KOH solution were investigated by hydrogen collection, polarization curve and electrochemical impedance spectroscopy(EIS). It was found that aluminum exhibits minimum corrosion rate in 4 mol•L-1 KOH solution containing 0.02 mol•L-1 EDTA, saturated Ca(OH)2 and saturated Sr(OH)2. EDAX analysis showed that alkaline earth metal ions and EDTA have no contribution to the formation of the surface film on aluminum. Therefore the inhibition effect may be caused by the adsorption of the inhibitor on aluminum surface. This fact indicates that these two ions act as interface inhibitors rather than inter-phase ones.

Key words: Pure aluminum, Alkaline solution, Corrosion, Alkaline earth metal, EDTA, Inhibitor