Engineering of corrosion product-polymer hybrid layers for enhanced CO2 corrosion protection of carbon steel part one: Corrosion study and mechanical property investigation

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. , …”

“…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.…”

“…This concentration was selected according to our previous studies where the concentration of the PAH polymer was optimized based on static corrosion experiments. 30 Electrochemical Approach. LPR tests were carried out to track the corrosion rate over time during the formation of FeCO 3 and the corrosion polymer−product layer on carbon steel samples.…”

“…A representative ionic polymer is poly­(allylamine hydrochloride) (PAH), a cationic polymer consisting of amine and ammonium active groups. 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. , …”