Abstract
Corrosion of concrete Rebar is persistently observed in building beams and columns. Due to this metallurgical problem, concrete structures become weak due to pitting corrosion of rebar, and the life of the building will be reduced. Products made of stainless steel are susceptible to corrosion in specific environments, mainly if they are open to a corrosive atmosphere, where localized oxidization may happen. This research examines how bare SS316L and plasma-nitrided SS316L respond to pitting corrosion in a Ground Granulated Blast-furnace Slag (GGBS) concrete environment. This research is unique because the chemical kinetics factors employed in the numerical model were established on an experimental campaign in Ground Granulated Blast-furnace Slag (GGBS) concrete environments. The primary emphasis of this work is pit development rather than the pitting start process. COMSOL Multiphysics simulation software is employed to complete 3D Finite element analysis (FEA) simulations in transient mode. Pits may be considered elliptical since, according to the examination of the investigational results, their mean width and depth are reasonably near together. In experimental results current density of bare (2.4 × 10-9 A/cm2) and plasma nitrided SS316L (0.5 × 10-9 A/cm2) stainless steel is observed. Experimental results of pitting corrosion are validated with Comsol multiphysics software for the current density of bare (2.12 × 10-9 A/cm2) and plasma nitrided SS316L (0.33 × 10-9 A/cm2) stainless steel is observed. According to numerical findings, the initial shape of the pit affects how it spreads. While an elliptical pit behaves differently, it maintains its form throughout propagation in radius over time.
Keywords: COMSOL Multiphysics, GGBS, Pitting Corrosion, Tafel plot.