Microelectrodes for the study of localized corrosion

Abstract

Microelectrodes have been developed which can measure the local pH, potential and chloride ion activity as a function of position within local corrosion sites. The electrodes have been characterized through studies of their stability, the interference of other ions involved in the corrosion of nickel- and iron-based alloys, and the spatial resolution of the microelectrodes. Techniques for eliminating the IR drop effects are discussed. Examples are given of the application of the microelectrodes to the study of localized corrosion.