Author(s)

J. Wu, S. Xing & F. Yun

Abstract

A one/hundredth scale hull model in linear scaled resistivity was used to simulate the cathodic protection potential distribution of a hull with different coating damage extent and position. The potential distribution of the hull was simultaneously measured by a PXI modular instrument and program written by Labview 7.1. At the same time, the potential and current density of the vessel with damage of 2%, 4% and 6% were calculated by the boundary element method (BEM). The results obtained from the physical scale model (PSM) method had agreement with the calculation results. The impressed current cathodic protection (ICCP) protection effect and its induced electric signature were simultaneously influenced by the coating damage extent and position. The damage extent mainly influenced the ICCP output current and the x axis’ electric signature; the damage position mainly influenced the electric signature of the y axis. Calculation results show that the electric signature increased about 35.7% due to coating damage of 6%. Keywords: cathodic protection, physical scale model, computer simulation, electric signature.

Keywords

cathodic protection, physical scale model, computer simulation, electric signature