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研究论文

扫描微电极法原位测量2024Al合金表面微区Cl~-浓度分布

  • 林玉华 ,
  • 邵敏华 ,
  • 胡融刚 ,
  • 李彦 ,
  • 杜荣归 ,
  • 林昌健
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  • 固体表面物理化学国家重点实验点,厦门大学化学系,固体表面物理化学国家重点实验点,厦门大学化学系,固体表面物理化学国家重点实验点,厦门大学化学系,固体表面物理化学国家重点实验点,厦门大学化学系,固体表面物理化学国家重点实验点,厦门大学化学系,固体表面物理化学国家重点实验点,厦门大学化学系 福建厦门361005 ,福建厦门361005 ,福建厦门361005 ,福建厦门361005 ,福建厦门361005 ,福建厦门361005

收稿日期: 2003-08-28

  修回日期: 2003-08-28

  网络出版日期: 2003-08-28

Fabrication of Scanning Micro Cl~- Probe and in Situ Imaging of Cl~- at the Interface of 2024 Al Aloy/Solution

  • LIN Yu_Hua ,
  • SHAO Min_Hua ,
  • HU Rong_Gang ,
  • LI Yan ,
  • DU Rong_Gui ,
  • LIN Chang_Jian
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  • (State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry Xiamen University,Xiamen 361005

Received date: 2003-08-28

  Revised date: 2003-08-28

  Online published: 2003-08-28

摘要

应用自研制扫描微电极测量系统和扫描微Ag/AgCl复合电极 ,原位测量含Cl- 溶液中 ,2 0 2 4Al合金在其局部腐蚀发生发展过程中金属 /溶液界面微区Cl- 离子的浓度分布 ,考察金属 /溶液界面微区Cl- 浓度分布对Al合金表面局部腐蚀行为的影响 .结果表明 ,扫描Ag/AgCl探针可实时跟踪腐蚀过程中金属表面氯离子浓度分布的动态行为 .当 2 0 2 4Al合金浸渍于含Cl- 溶液中 ,Cl- 离子在Al合金 /溶液界面呈不均匀分布 ,Cl- 主要在第 2相颗粒和铝基交界区域发生优先吸附和累积 ,从而促进局部腐蚀的发生和发展

本文引用格式

林玉华 , 邵敏华 , 胡融刚 , 李彦 , 杜荣归 , 林昌健 . 扫描微电极法原位测量2024Al合金表面微区Cl~-浓度分布[J]. 电化学, 2003 , 9(3) : 280 -286 . DOI: 10.61558/2993-074X.1516

Abstract

Micro combination Ag/AgCl electrode with a tip measuring tens micron in diameter was fabricated. The probe satisfied in situ imaging of Cl - distribution at metal surface in chloride solution because of its excellent linearity between potential and Cl - concentration, rapid response, good stability and selectivity. With the aid of the home made Micro Electrode Scanning system and scanning Cl - probe, the effect of the [Cl - ] at 2024_Al/solution interface on localized corrosion process was investigated. It was demonstated directly that Cl - ion in solution immigrated toward, then adsorbed preferentially and accumulated at the junction between the Al_Cu_Mg secondary phase and Al matrix, the uneven distribution of Cl - accelerated the initiation and development of localized corrosion of 2024_al alloy in Cl - containing solution.
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