電気防食下における港湾構造物の電位分布解析

概要

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As the numerical method to analyse the potential distribution in a protection cell with a sacrificial anode, the finite element method adding the conservation law of protection current has already been proposed by the authors. In order to investigate the applicability of the numerical method to anticorrosion design of marine structures protected with a sacrificial anode, potential distributions of real structures built in harbors were analysed by the numerical method and compared with measured values. The results are summarized as follows : (1) The numerical method is applicable to estimate potential distributions in real marine structures. (2) The time elasped since the cathodic protection is started should be specified in the estimation of the potential, because the polarization characteristics of steel in sea water changes with time. If the polarization characteristics correspond to the elapsed time is given to the estimation, the potential distribution estimated by the numerical method is in good agreement with the measured results. (3) The cathodic polarization curve, of which the surface resistance of steel in sea water is 6Ω・m^2, is suitable for the anticorrosion design of marine steel structures.
社団法人日本船舶海洋工学会の論文