2020 Volume 76 Issue 1 Pages 46-56
The present study was undertaken to estimate the method for the determination of corrosion rate of steel covered with sand and masonry. The diffusion-limited current density of dissolved oxygen in the environment is one the most predominant factors influencing the determination and rate of microcell corrosion of steel in seawater. The rate of electrochemical corrosion of steel under sand deposit and masonry is similarly determined using diffusion-limited current density of dissolved oxygen in the environment. Parameters like particle size, thickness of the barriers, diffusion coefficient, and concentration of dissolved oxygen (DO) were employed in the estimation of diffusion-limited current density of DO. It is pertinent to note that, corrosion behavior of steel in an the environment is not only shaped by microcell corrosion effect, but also by macrocell corrosion formed at the barrier due to environmental conditions, and other factors. Therefore, to achieve effective corrosion protection of steel, the total value of microcell and macrocell corrosion rates should be evaluated to determine the area of application. Hence, the estimation method described above was used for the microcell corrosion estimation, and finite element analysis (FEM) was used for the macrocell corrosion estimation. Finally, the application area of corrosion protection was considered from the balance of inflow and outflow of the current density caused by both the corrosions.
