Three-Dimensional Electric Field Predictions of an Iron-Copper Galvanic Couple.
Abstract
Based on completed experimental electric field scans and the corresponding finite element field predictions, it appears that the finite element numerical technique presents a strong analytical tool in calculating the nearfield electric intensity distributions about active microcells. These calculations were analytically achieved with the new double membrane finite element configuration representing nonlinear polarization and with a local tangent slope (impedance) definition dependent on the local potential difference. The experimental determination of the multidimensional current density structure was realized with a newly developed scanning vibrating electrode technique (SVET). The finite element model developed in this paper uses a priori measured uncoupled polarization curves for pure iron and pure copper. The current densities and the electric field intensities were calculated in the X, Y, and Z directions within specific regions of the electrolyte and on its boundaries. Results appear to indicate that first-order anodic mass loss can be predicated using (1) numerically predicted current density distributions on the anodic surface and (2) Faraday's law. The electric field correlation established in this work for the three-dimensional current density components provides the confidence to proceed in the evaluation of time-dependent effects of electric fields and multipolarized surfaces associated with pitting and crevice corrosion.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 18, 1987
- Accession Number
- ADA178040
Entities
People
- Rolf G. Kasper
Organizations
- Naval Underwater Systems Center