Work

Performance of 316 L and 304 L stainless steels in the APBS-CDRMax® solvent for CO2 capture processes: Insights into corrosion resistance and stability

Year: 2025

Type: article

Abstract: This study focuses on investigating the corrosion performance of SS 304L and SS 316L stainless steels when exposed to the APBS-CDRMax® solvent, under various conditions, including CO2 and presence of SOX/NOX contaminants. Electrochemical techniques, including potentiodynamic and cyclic polarization were employed, along with Inductively Coupled Plasma (ICP) analysis to evaluate both the short-term corrosion rate and the pitting tendency. Scanning Electron Microscopy (SEM) coupled with Energy Dispersive X-Ray (EDX) analysis provided insights into the underlying corrosion mechanism. Long term exposure tests were also carried out at temperatures up to 90°C to assess the long-term corrosion behavior of the stainless steels and stability of the solvent. Findings indicated that APBS-CDRMax® presents extremely low corrosion rates, even in the presence of high concentrations of sulfuric and nitric acid used to simulate the effects of SOX and NOX dissolution. The observed corrosion rates were multiple times lower than those of the benchmark monoethanolamine (MEA) solvent. Microscopic observation and EDX analysis identified the presence of black layers associated with amine byproducts and different types of corrosion precipitates, many of which were linked to the inherent properties of the solvent. Long-term exposure tests indicated a tendency for the stainless steels to form corrosion precipitates, confirming the solvent’s exceptional low corrosivity over time and revealed a stabilization of the corrosion process after 7-10 days of exposure to the solvent. After long-term exposure of solvent to conditions causing thermal degradation, little signs of degradation occurred, loading capacity remained virtually intact, whereas density and viscosity also remained stable.

Source: Materials Today Communications

DOI: 10.1016/j.mtcomm.2025.114489