A three-dimensional boundary element method (3D-BEM) was developed for predicting electrogalvanic field responses resulting from anodic/cathodic interaction. Although the governing equation is linear (Laplace), the boundary condition (based on experimentally determined polarization curves) is generally nonlinear. Therefore, the Newton-Raphson iterative procedure was used. An experiment was also conducted on galvanic corrosion of a cylindrical vessel of cast iron and stainless steel, which was filled with 0.0165 wt% NaCl solution. In addition, the cathodic protection provided by placing a small piece of aluminum plate on the cylindrical vessel was examined experimentally. The validity and usefulness of the present prediction method were demonstrated by comparing the calculated results and the experimental data.

Subject
Current measurements, Boundary element method, Polarization curves, Sodium chloride solution, Experimental data, Current densities, Steel, Cast iron, Stainless steel, Polarization, Electrochemical potential, Corrosion potential, Electrolytes
National Association of Corrosion Engineers
1988
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