THE INFLUENCE OF TEMPERATURE ON THE GALVANIC CORROSION OF A CAST IRON-STAINLESS STEEL COUPLE (PREDICTION BY BOUNDARY-ELEMENT METHOD)

The general and galvanic corrosion of carbon steel (SS400) and stainle ss steel (SUS304) in CO2 + NaCl aqueous solution at elevated temperatu res has been analyzed using electrochemical measurements and computati onal simulation. The potential and current density distributions on th e galvanic elements are described by the Laplace equation, and for num erical calculation the boundary element method has been used. The expe rimentally determined polarization curves have been used in order to d efine the nonlinear boundary conditions. This boundary value problem h as been solved using the Newton-Raphson iterative numerical procedure. Additional thermodynamic and kinetic analysis was conducted to explai n the observed corrosion behaviour. (C) 1997 Elsevier Science Ltd.