Engineering of corrosion product-polymer hybrid layers for enhanced CO2 corrosion protection of carbon steel part two: Computational investigation and surface characterisation

Effect of Indole-2-carboxylic Acid on the Self-Corrosion and Discharge Activity of Aluminum Alloy Anode in Alkaline Al–Air Battery

“…Different placements of the ICA inhibitor on the Al(111) surface have been examined, and the relative adsorption energies ( E ads ) for each configuration were calculated (see Figure 11 a). In the most stable configuration related to the neutral form, the molecule adsorbs on Al(111) surface in a nearly parallel orientation with an E ads of −0.92 eV, establishing π–π interactions with Al(111) through the aromatic ring of the indole group, as already observed for other metals in previous studies [ 42 , 43 ]. The formation of the π–π interactions results in a strong stabilization of the adsorption energy.…”

Augmentation of Polymer-FeCO3 Microlayers on Carbon Steel for Enhanced Corrosion Protection in Hydrodynamic CO2 Corrosion Environments

“…Additionally, injecting PAH polymer at an 8 h precorrosion reduces the corrosion rate from 0.5 to 0.2 mm/year, indicating an impact on corrosion kinetics, indirectly suggesting an interaction between the polymer and both the steel surface and corrosion product layer. This aligns with the PAH corrosion efficiency observed in static conditions when the precorrosion time was extended to 24, 34, and 44 h. 29,30 Generally, the corrosion measurements in Figure 2 suggest that the PAH interferes with the growth of the FeCO 3 , and this could be through reducing Fe 2+ flux into the solution, not necessarily through direct interaction of the crystals with the PAH. However, the fact that the CR drops more when FeCO 3 exists on the surface suggests that there may be some interaction between PAH and preformed FeCO 3 crystals.…”

“…In our previous studies, this polymer has displayed strong affinity toward carbon steel and the FeCO 3 corrosion product layer, producing a polymer− corrosion product hybrid layer, which holds distinctive physicomechanical properties, i.e., enhanced adhesion strength, elastic modulus, and resistance to shear stresses, when compared with the natural FeCO 3 layer. 29,30 Herein, this study under hydrodynamic CO 2 corrosion conditions aims to 1. Engineer, in situ, a polymer−corrosion product layer consisting of the inorganic FeCO 3 corrosion product and the organic PAH polymer on X65 carbon steel.…”

Inhibition Effect of Triphenylmethane Dyes for the Corrosion of Carbon Steel in CO2-Saturated NaCl Corrosion Medium

“…For the N 1s spectrum ( Figure 7 c), the peak at 399.1 eV is attributed to the C-N in the corrosion inhibitor molecule, while the peak at 399.9 eV corresponds to N-Fe [ 41 , 42 ]. The O 1s spectrum features three peaks at 530.2, 531.9, and 532.7 eV, which are assigned to FeO, C=O, and CO 3 2− , respectively [ 43 , 44 ]. In the Fe 2p spectrum, two typical Fe2p1/2 and Fe 2p3/2 peaks are observed at binding energies of 725.0 eV and 709.3 eV, respectively.…”

“…The corrosive solution is saturated with carbon dioxide containing 5% NaCl, and it is rich in species such as H 2 O, HCO 3 − , CO 2 , H 2 CO 3 , and Cl − ( Figure 11 ), which can severely corrode the surface of carbon steel. The anodic process involves the dissolution of Fe, while the cathodic process involves the reduction of H + and H 2 CO 3 [ 1 , 43 ]. Upon the addition of the dye, surface analysis through XPS and theoretical calculations suggests that the dye can adsorb onto the steel surface both physically and chemically.…”