N-substituted methyl ethylenediamine derivatives as corrosion inhibitors for carbon steel in 1 M hydrochloride acid

Investigation of Sulfonium-Iodide-Based Ionic Liquids to Inhibit Corrosion of API 5L X52 Steel in Different Flow Regimes in Acid Medium

“…61 The K ads value was equal to 2.82 × 10 4 mM −1 and was calculated by the reciprocal of the y-intercept (K ads = 1/b) of the linear regression in Figure 8. This parameter allows the computation of the Gibbs free energy of adsorption (ΔG°a ds ) from eq 5 62,63 °= G RT K ln (55.5 ) ads ads (5) where R is the universal gas constant (8.314 kJ mol −1 •K −1 ), T is the system absolute temperature (K), and 55.5 is the water concentration in the solution. The ΔG°a ds of [DDMS + I − ] was equal to −35.36 kJ mol −1 , which suggests that the IL adsorption mechanism involved the combination of physisorption (electrostatic forces) and chemisorption (coordinate bonds), 37,64 which implied a higher interaction between the IL and the steel surface.…”

“… 3 , 4 CIs control the corrosion reactions that take place on the metal by an adsorption process that is affected by different factors such as the nature and surface charge of the metal, electronic structure, steric factors, aromaticity, functional groups with double and triple bonds, and high-density heteroatoms (N, O, S, and P) present in the inhibiting organic molecules. 5 , 6 …”

“…3,4 CIs control the corrosion reactions that take place on the metal by an adsorption process that is affected by different factors such as the nature and surface charge of the metal, electronic structure, steric factors, aromaticity, functional groups with double and triple bonds, and high-density heteroatoms (N, O, S, and P) present in the inhibiting organic molecules. 5,6 Inorganic compounds like chromates, nitrates, molybdates, phosphates, silicates, and arsenic have been used as CIs, which when combined with the oxide layer provide the metal surface with passivation protection. 7 Notwithstanding, these compounds represent potential danger for the health, for they are highly toxic chemicals.…”

“…In the oil industry, steel corrosion is regarded as one of the most serious problems to be dealt with due to the exposure of this metallic material to different conditions throughout a variety of industrial operations. In particular, during the extraction and transport of oil, the formation of acid media and flow conditions increase the corrosion rate, which provokes the degradation of metallic structures, and therefore, pipeline failures and damage of equipment and installations, which are part of different processes as a result of the shortening of the useful life of steel pieces. , Diverse methods conceived to control corrosion at the industrial level have been put into practice; among these strategies, corrosion inhibitors (CIs) have been employed, which have been accepted willingly for their low cost and easy application with different alloys and corrosive media. , CIs control the corrosion reactions that take place on the metal by an adsorption process that is affected by different factors such as the nature and surface charge of the metal, electronic structure, steric factors, aromaticity, functional groups with double and triple bonds, and high-density heteroatoms (N, O, S, and P) present in the inhibiting organic molecules. , …”

Small Organic Molecule as Corrosion Inhibitors for Mitigating Metal Corrosion

“…Both inhibitors P-Gly (99.01%) and P-Lys (99.36%) showed excellent corrosion inhibition efficiency at 800 mg/L for 120 h. Theoretical calculations done by QC based on DFT and GFN-xTB methods and MD-based RDFs revealed the chemisorption of the inhibitors. N-substituted methyl ethylenediamine derivatives, tetramethylethylenediamine (TDA), pentamethyldiethylenetriamine (PTA), and hexamethyltriethylenetetramine (HTA) are used as corrosion inhibitors for 20# steel in 1 M HCl [22]. The corrosion property of three inhibitors is conducted by WL, PDP, EIS, and surface analysis techniques.…”