from the conferences organized by TANGER Ltd.
Corrosion and material selection are critical challenges in the practical design and operation of power plants, chemical plants, pipeline transportation systems, and wells. All of these are components of the systems used to capture and store carbon dioxide (CCS). To guarantee compatibility between the working medium and the structural material, it is necessary to determine which materials are most appropriate. These materials mostly comprise steels or specific nickel-based alloys. We selected Inconel 738 for our investigation. The corrosion coupons of Inconel 738 were exposed to impure carbon dioxide in the High-Temperature Furnace (HTF) at 750 °C and 900 °C for 250, 500 and 1000 hours. The specimen surface, corrosion layer thickness and composition were evaluated by Scanning Electron Microscope (SEM) with Energy Dispersive Spectroscopy (EDS). Glow Discharge Optical Emission Spectrometry (GD-OES) and gravimetric methods were also used to evaluate the materials. All the specimens were covered with an uniform protective oxide layer, growing with exposure time. The layer contained mainly Cr, O2 and a minor amount of Ti. At a temperature of 900 °C, the specimen's weight and corrosion layer thickness increased significantly. These measurements yield an evaluation of the quality of the tested materials, as well as an assessment of their corrosion resistance.
Keywords: nickel alloy, corrosion, CCS technology, carbon dioxide© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.