Corrosion Studies of Metal Alloys in Carbonated Ionic Liquid Solution

Abstract

Saturated carbonated solvent in carbon capture plant in industries has lower pH results in serious corrosion to the material of construction. Material corrosion can have an impact on plant integrity since it reduces efficiency and significantly increases maintenance costs. The acid-gas loading sections, such as the liquid storage, absorption unit, lean-rich exchanger, and regenerator unit, are particularly prone to corrosion during the carbon-capture process. In an aqueous ionic liquid-CO₂ environment, the corrosion rates of carbon steel, aluminium, copper, and stainless steel are investigated using weight loss and electrochemical techniques. Polarisation-resistance measurements and extrapolation from Tafel plots were used to calculate the corrosion current densities. The change in surface morphology is also observed using a scanning electron microscope (SEM). The results of the measurements demonstrate that the investigated ionic liquid is found to be a corrosion inhibitor in carbonated solutions. Stainless steel was discovered to exhibit resistance in ionic liquid systems that were both carbon dioxide-free and carbonated-diluted. The corrosion rate was found to be roughly the same for both experimental techniques.