電気防食下における電位分布の数値解析 : その1 2次元有限要素法の適用

概要

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The cathodic protection is an effective anticorrosion technique for offshore structures below the water line. Therefore, it is important that the potential distributions around structures are made clear in process of structural design. In conventional methods for numerical analysis, iterative technique had been applied to determination of potential distributions in corrosion cells. In this report, a more convenient numerical method to analyse the potential distribution under the cathodic protection is proposed for the purpose of a rational anticorrosion plan. In this method, the potential distribution can be obtained by the application of FEM once for all, on the assumption that polarisation characteristics of electrodes in elctrolyte are linear. Although polarisation characteristics in a real cell are nonlinear, the present method can be applied to such a real cell by means of linearisation of polarisation characteristics in each domain of potential. The potential distribution of the galvanic cell, in which mild steel in 3% N_aCl solution was protected with sacrificial anode of zinc, was analysed by the present method and was measured also. The numerical solution of the potential distribution was in good agreement with measured values.
社団法人日本船舶海洋工学会の論文