Electrochemical response of micro-alloyed steel under potentiostatic polarization in CO2 saturated brine

Abstract

This is a repository copy of Electrochemical response of micro-alloyed steel under potentiostatic polarization in CO saturated brine ₂ .

Corrosion behavior of carbon steel in chloride and bicarbonate ion‐enriched and CO2‐saturated solutions

“…Considering the ferrite-pearlite microstructure of 1020 carbon steel (Figure 1a microstructure of 1020 carbon steel. [26] Furthermore, several large-size crystals precipitate on the steel surfaces over the period of 24-72 hrs, leading to the obvious decrease of general corrosion rate over this period, as indicated in Figure 2a. , compared with that of the corrosion products (region C), indicating that an inner layer is formed once the tested specimen is immersed in the solution.…”

“…In the CO 2 -saturated acidic environment, the selective dissolution of ferrite within the ferrite-pearlite microstructure causes the residual of pearlite (ferrite + Fe 3 C), as its corrosion potential is more positive than that of ferrite. [26] Similarly, there is a formation of a galvanic cell between Fe 3 C and ferrite, owing to a more positive potential of Fe 3 C compared with ferrite, [26,39] leading to the accumulation of massive Fe 3 C. [40] Furthermore, the more cathodic sites (pearlite and/or Fe 3 C) induce the acceleration of corrosion attack. [40,41] As such, the higher general corrosion rates are obtained in the CO 2 -saturated solution containing solely Cl − (Figure 2a) and/or a two-stage reaction involving HCO 3 − , as represented by the following equations: [32,34] Fe + CO FeCO , In literature, [42][43][44][45] the precipitation of FeCO 3 has been mainly associated with saturation ratio/bulk solution chemistry, and the saturation ratio for FeCO 3 is commonly quantified, considering the concentration of Fe 2+ and CO 3 2− in the bulk.…”

Corrosion Behavior of Carbon Steel in Diethylenetriamine Solution for Post-combustion CO2 Capture

“…As ferrite continued to dissolve, more Fe 3 C was exposed, resulting in increased corrosion attacks. 35,37,38 XRD results for the surface in Figure 10 indicate that with an increase in CO 2 loading, the relative intensity of peaks for Fe 3 C residues continuously decreased. A smaller amount of carbide on the surface corresponded to a lower CR, 23 consistent with weight loss method results.…”