抄録
An experiment to examine the possibility of identification of coating defect was performed on a model of pipe-line in sea water. The pipe-line model which is made of SS steel pipe is set in resin made vessel which was filled with 0.001% NaC1 solution. A small current was impressed to the model. In order to keep the temperature of the solution at 30±0.5°C, the vessel was placed in an isothermal chamber filled with water. The distribution of the potential on the surface of the solution was measured using an electrometer with the glass capillary tip. A platinum counter electrode was used with a reference electrode ( SCE : Saturated Calomel Electrode ). The Poisson's equation, which describes the potential in the electrolyte, was so1ved by the boundary element method. The detection was performed by minimizing the difference between actual and calculated values of potential. By using the data of the above experiment, locatons of coating defects were succesfully detected, and the corrosion rates were correctly estimated.
