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Citation: Shao Min-Hua, Huang Ruo-Shuang, Hu Rong-Gang, Lin Chang-Jian. Fabrication of Composite Scanning Micro pH Electrode and Its Application in Localized Corrosion[J]. Acta Physico-Chimica Sinica, ;2002, 18(10): 934-937. doi: 10.3866/PKU.WHXB20021014 shu

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

1.
State Key Laboratory of Physical Chemistry for Solid Surfaces, Department of Chemistry, Department of Materials Science and Engineering, Xiamen University, Xiamen　361005

Received Date: 31 January 2002
Available Online: 15 October 2002

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.
- Al alloy;Localized corrosion;Scanning micro pH electrode;IrO_x-pH electrode
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