Corrosion Protection Design Of Seawater Pump By Boundary Element Analysis System

Lecturepg. 121A computer aided corrosion-analysis-system to which boundary element method (BEM) is applied has been developed, and is utilized for diagnostic galvanic corrosion and designing cathodic protection of seawater and brine pumps. Using the BE analysis technique, potential and current density distributions on the object can be calculated under three conditions: • 3-D geometry of the object • Polarization curves (relationship between current density and potential, which is measured in the laboratory) of pump materials and sacrificial anodes, and • Conductivity of the solution. Hence, it is possible to estimate the protective effectiveness with the potential distribution, and the life of sacrificial anodes for cathodic protection and corrosion rate of galvanic corrosion can be calculated with the current densities. The BE analysis system consists of: • Element segmentation software, • Input file preparation software, • Boundary element analysis software, • Input/output data graphic software, and • Polarization curve database. The quantitative corrosion prediction obtained with this analytic system make it possible to rationalize corrosion protection design and maintenance, improve the operational reliability of machinery, and reduce cost