- Author
- Lin, C. J. | Du, R. G. | Nguyen, T.
- Title
- In-Situ Imaging of Chloride Ions at the Metal/Solution Interface by Scanning Combination Microelectrodes.
- Coporate
- Xiamen University, China National Institute of Standards and Technology, Gaithersburg, MD
- Journal
- Corrosion, Vol. 56, No. 1, 41-47, January 2000
- Keywords
- chloride ion | ion selective microelectrode | imaging | interface | microelectrode | solution/metal
- Abstract
- Combination solid silver-silver (Ag/AgCl) and liquid membrane Cl- ion-selective microelectrodes have been designed and constructed. These microelectrodes, which have a micrometer size tip, contain two compartments, one serves as the reference electrode and the other as the Cl- ion-selective electrode. The microelectrodes have been used to map in situ Cl- ion distribution in several localized corrosion systems. When used with a computerized scanning stage, the microelectrodes can provide information on the distribution of Cl- ions near the metal/electrolyte interface. Cl- ions were observed to migrate towards, and accumulate near, the anodic region forming a "chloride ion rich island" on the metal surface. Scanning combination Cl- ion-selective microelectrodes may provide a useful tool for mechanistic studies of localized corrosion.