物理化学学报 >> 1998, Vol. 14 >> Issue (08): 719-724.doi: 10.3866/PKU.WHXB19980810

研究论文 上一篇    下一篇

DDA在碱酸介质中的存在状态与缓蚀行为的关系

李瑛, 林海潮, 曹楚南   

  1. 中国科学院金属腐蚀与防护研究所 金属腐蚀与防护国家重点实验室,沈阳 110015
  • 收稿日期:1997-11-13 修回日期:1998-02-13 发布日期:1998-08-15
  • 通讯作者: 李瑛

Relationship between the Existing Form and Inhibiting Behavior of DDA on Inhibiting Interface

Li Ying, Lin Hai-Chao, Cao Chu-Nan   

  1. State Key Laboratory for Corrosion and Protection,Institute of Corrosion and Protection of Metals,Chinese Academy of Sciences,Shenyang 110015
  • Received:1997-11-13 Revised:1998-02-13 Published:1998-08-15
  • Contact: Li Ying

摘要:

利用电化学方法、物理检测技术及表面分析技术,针对十二烷基胺(DDA)作用于FeNiSiB非晶合金表面时,在不同浓度范围内,缓蚀效率与缓蚀剂浓度存在不同的对应关系的现象,探讨了DDA的存在状态与其缓烛行为的关系.利用物理测量技术对临界浓度前后DDA的存在状态进行了分析,利用扫描隧道显微镜捕获了高浓度时DDA在非晶合金表面的典型结构,详细阐述了DDA对非晶合金的微观缓蚀机制.

关键词: 十二烷基胺, 胶束, 缓蚀机理

Abstract:

The relationship bettween the existing form and inhibiting behavior of dolecylamme(DDA) On amorphous alloy has been studied by electrochemical measurement, physical test and scanning tunneling microscopy. The experiment shows that there is different relationship between the inhibition concentration and inhibition percentage in different concentration scale. In wDDA=10-6~10-4 concentration range, the inhibition percentage increased strongly with the inhibitor concentration but the increase tendency of inhibition percentage became gently in 10-4~10-3 concentration scale. The adsorption isotherm formula fitting result shows that a typicd mono-molecular layer of DDA was adsorbed on amorphous alloy during 10-6~10-4concentra-tion scale, without any effect from the neighbor inhibitor molecule, but in 10-4~10-3 range the force between the nearing neighbor inhibitor molecule decided the adsorption form. The result from STM and conductivity test indicats that the micelle had formed when the concentration approached WDDA=2.3 X 10-5, the protection effect DDA was prevented because of the forming of micelle.

Key words: Dodecylamine, Micelle, Inhibiting mechanisum