SEDL / STP / STP978-EB / STP26194S

Comparisons of Localized Ionic Currents as Measured from 1-D and 3-D Vibrating Probes with Finite-Element Predictions for an Iron-Copper Galvanic Couple

Kasper, RG
Staff scientists, Naval Underwater Systems Center, New London, CT

Crowe, CR
Supervisory materials engineer, Naval Research Laboratory, Washington, DC,

Pages: 18    Published: Jan 1988

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Abstract

The ionic current density in the near-field of a corroding iron-copper galvanic couple was measured, and the results were compared with the predictions of a finite- element model, which calculates near-field potential and current density distributions. All three components of the ionic current density vector were measured using a three-dimensional vibrating microprobe. The calculated current densities were based on the measured polarization curves of the individual constituent materials forming the couple. Agreement between the predicted and measured results was excellent. Agreement between one-dimensional ionic current density distributions from previous work was also excellent.