In this work, a time-dependent study on corrosion defect evolution of steel pipelines of grade X100 is presented. Due to the symmetry of the pipeline geometry, a 2D model based on finite element method is used to quantify the temporal behavior of this important asset temporal response. The Multiphysics interactions equations are first provided where the mechanical part is included with elasto-plastic stress equation, the electrical part is introduced via potential and current densities of anode and cathode of the electrolyte and the time-dependent property is implemented via a deformed geometry tool in COMSOL interface to have an idea about the pipeline integrity window over time. Results demonstrated that the anodic, cathodic current densities, as well as, the Von Mises stress are influenced by the dimension change (length, width, depth) of the corrosion spot over a period of time of 20 years.