Abstract
Some points in the mathematical model of cathodic protection problem in infinite field are discussed. The boundary element method applicable to 3-D 1/2-infinite, 1/4-infinite and 1/8-infinite field cathodic protection problems is derived. Using an appropriate fundamental solution for each case, only the interface between the structure and electrolyte needs to be discretized. Both triangular linear and rectangular bilinear elements are employed to discretize the boundary surface of 3-D field more efficiently and accurately. After several pilot computations for accuracy analysis, the electropotential distribution on the interface between seawater and a ship body under cathodic protection is calculated, and the numerical results show that the present method is accurate and efficient.
