物理化学学报 >> 2002, Vol. 18 >> Issue (10): 934-937.doi: 10.3866/PKU.WHXB20021014

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复合型扫描微pH电极及其在局部腐蚀中的应用

邵敏华;黄若双;胡融刚;林昌健   

  1. 厦门大学化学系，材料科学与工程系，固体表面物理化学国家重点实验室，厦门　361005
  • 收稿日期:2002-01-31 修回日期:2002-03-27 发布日期:2002-10-15
  • 通讯作者: 林昌健 E-mail:cjlin@xmu.edu.cn

Fabrication of Composite Scanning Micro pH Electrode and Its Application in Localized Corrosion

Shao Min-Hua;Huang Ruo-Shuang;Hu Rong-Gang;Lin Chang-Jian   

  1. State Key Laboratory of Physical Chemistry for Solid Surfaces, Department of Chemistry, Department of Materials Science and Engineering, Xiamen University, Xiamen　361005
  • Received:2002-01-31 Revised:2002-03-27 Published:2002-10-15
  • Contact: Lin Chang-Jian E-mail:cjlin@xmu.edu.cn

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摘要： 研制了一种新型的微米级复合型扫描pH探针.该探针具有体积小、响应速度快、稳定性好和制作方便等优点，能很好地满足微区pH快速测定的要求.应用复合型扫描微pH电极技术研究了Al/Cu合金在0.01 mol•L－1 NaCl溶液中开路状态下局部腐蚀发生的早期过程.

关键词: Al合金, 局部腐蚀, 扫描微pH电极, IrOx-pH电极

Abstract: A novel composite scanning micro pH electrode was fabricated. The IrOx-pH electrode produced in a carbonate melts exhibited high stability, a fast potential response and ideal Nernstian response. The slope of the electrode at 15 ℃ was 56.8 mV/pH, which was very close to the theoretical value. The 90％ potential response time for a pH change from 1.75 to 13.90 was less than 0.5 s. The composite scanning micro pH electrode is a promising apparatus for detecting the pH distribution on metal/solution interface. pH image on the surface of Al/Cu galvanic couple showed that both the anodic and cathodic areas could be sensed well. Localized corrosion took place on the interface of Al/Cu couple. The localized corrosion developed with time and pH value around the pitting decreased gradually.

Key words: Al alloy, Localized corrosion, Scanning micro pH electrode, IrOx-pH electrode