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. 2022 Aug 16;27(16):5209.
doi: 10.3390/molecules27165209.

Sweet Corrosion Inhibition by CO2 Capture

Jesus Porcayo-Calderon  1 , Jorge Canto  2 , L M Martinez-de-la-Escalera  2 , Adrian Neri  2
Affiliations

Sweet Corrosion Inhibition by CO2 Capture

Jesus Porcayo-Calderon et al. Molecules. .

Abstract

The most practical and economical way to combat the problems derived from CO2 corrosion (sweet corrosion) is the use of corrosion inhibitors of organic origin. Its main protection mechanism is based on its ability to adsorb on the metal surface, forming a barrier between the metal surface and the aggressive medium. However, despite its excellent performance, its inhibition efficiency can be compromised with the increase in temperature as well as the shear stresses. In this study, the use of an inorganic inhibitor is proposed that has not been considered as an inhibitor of sweet corrosion. The reported studies are based on using LaCl3 as a corrosion inhibitor. Its behavior was evaluated on 1018 carbon steel using electrochemical measurements, such as potentiodynamic polarization curves, open-circuit potential measurements, linear polarization resistance measurements, and electrochemical impedance. The results showed an inhibition efficiency of the sweet corrosion process greater than 95%, and that the inhibition mechanism was different from the classic corrosion process in CO2-free electrolytes. In this case, it was observed that the inhibitory capacity of the La3+ cations is based on a CO2-capture process and the precipitation of a barrier layer of lanthanum carbonate (La2(CO3)3).

Keywords: CO2 capture; corrosion; inhibitor; lanthanum carbonate; lanthanum chloride.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Polarization curves for 1018 carbon steel in CO2-saturated brine at different concentrations of lanthanum chloride after 50 h of immersion.
Figure 2
Figure 2
Evolution of OCP values for 1018 carbon steel in CO2-saturated brine at different concentrations of lanthanum chloride.
Figure 3
Figure 3
Evolution of polarization resistance values for 1018 carbon steel in CO2-saturated brine at different concentrations of lanthanum chloride.
Figure 4
Figure 4
Effect of LaCl3 concentration on inhibition efficiency.
Figure 5
Figure 5
Nyquist and Bode diagrams for 1018 carbon steel in CO2-saturated brine at different concentrations of lanthanum chloride after 50 h of immersion. (a) Nyquist diagram; (b) Bode diagram in its impedance modulus format; (c) Bode diagram in its phase angle format.
Figure 5
Figure 5
Nyquist and Bode diagrams for 1018 carbon steel in CO2-saturated brine at different concentrations of lanthanum chloride after 50 h of immersion. (a) Nyquist diagram; (b) Bode diagram in its impedance modulus format; (c) Bode diagram in its phase angle format.
Figure 6
Figure 6
Evolution of Nyquist and Bode diagrams for 1018 steel in CO2-saturated brine at 60 °C. (a) Nyquist diagram; (b) Bode diagram in its impedance modulus format; (c) Bode diagram in its phase angle format.
Figure 7
Figure 7
Evolution of Nyquist and Bode diagrams for 1018 carbon steel in CO2-saturated brine at 60 °C and 1 mM of LaCl3. (a) Nyquist diagram; (b) Bode diagram in its impedance modulus format; (c) Bode diagram in its phase angle format.
Figure 8
Figure 8
The morphological aspect of 1018 carbon steel after corrosion test in CO2-saturated brine solution after 50 h: (a) corrosion products surface; (b) clean surface.
Figure 9
Figure 9
X-ray diffraction pattern of the surface of 1018 carbon steel; (a) not corroded, (b) corroded, (c) corroded with the addition of LaCl3.
Figure 10
Figure 10
The morphological aspect of 1018 carbon steel after corrosion test in CO2-saturated brine solution at different concentrations of the added inhibitor. 0.1 mM; (a) corrosion products surface; (b) clean surface. 1.0 mM; (c) corrosion products surface; (d) clean surface. 10.0 mM; (e) corrosion products surface; (f) clean surface.
Figure 10
Figure 10
The morphological aspect of 1018 carbon steel after corrosion test in CO2-saturated brine solution at different concentrations of the added inhibitor. 0.1 mM; (a) corrosion products surface; (b) clean surface. 1.0 mM; (c) corrosion products surface; (d) clean surface. 10.0 mM; (e) corrosion products surface; (f) clean surface.
Figure 11
Figure 11
Approach to the surface of 1018 carbon steel evaluated with the addition of 1.0 mM of LaCl3. (a) secondary electron image; (b) Fe mapping; (c) O mapping; (d) C mapping; (e) La mapping.
Figure 11
Figure 11
Approach to the surface of 1018 carbon steel evaluated with the addition of 1.0 mM of LaCl3. (a) secondary electron image; (b) Fe mapping; (c) O mapping; (d) C mapping; (e) La mapping.
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