Micro‐galvanic corrosion of duplex stainless steel annealed at different temperatures evaluated by experiments and a numerical simulation model

Abstract

In this study, micro‐galvanic corrosion of SAF 2205 duplex stainless steel (DSS) annealed at different temperatures with different phase ratios (α/γ) in a 1 M H2SO4 + 1 M NaCl solution is analyzed by zero resistance ammeter (ZRA), immersion and numerical simulation model. COMSOL Multiphysics is used to solve the numerical simulation model and predict the local current density, potential distribution, and morphology of DSS annealed at different temperatures with different phase ratios. The modeling results are in good agreement with the immersion test results, which indicate that the micro‐galvanic corrosion depth of SAF 2205 DSS annealed at different temperatures initially decreases and then increases with the increase in the phase ratios (α/γ). The best micro‐galvanic corrosion resistance is obtained at an annealing temperature of 1100°C.