Effects of Surfactant Aggregation and Adsorption on Steel Corrosion Inhibition in Salt Solution

Abstract

The corrosion inhibition efficiency of mixtures of three homologous benzalkonium chlorides (BAC) surfactants was investigated using electrochemical measurements and modeling. The surface aggregation concentration (sac) and critical micelle concentration (cmc) of surfactant are useful to evaluate inhibition efficiency. A new cmc prediction model for ternary mixed homologous surfactants of interest has been developed. The model is applicable over a wide concentration range of dissolved salt in solution. The combination of the modified Langmuir adsorption model and the cmc prediction model provides a potential method for inhibition efficiency prediction of various mixed homologous surfactant systems at various dissolved salt concentrations.

Solvent Isotopic Effects on a Surfactant Headgroup at the Air–Liquid Interface

“…In this study, we assess the solvent isotopic effects on the interfacial conformation of a surfactant at the air–water interface, using sum frequency generation (SFG) vibrational spectroscopy. Recent studies involving surfactants have focused on water interfacial structure or the influence of broad O–H and O–D stretch bands on the C–H stretching modes; yet, very few assess solvent effects on the structure of the interfacial surfactant itself. , Here, we chose the quaternary ammonium cation 1 (see the Supporting Information (SI) for its preparation), as it belongs to the important class of “Quat” cationic surfactants used as corrosion inhibitors, especially for carbon steel in acidic media. , …”

“…9,11 Here, we chose the quaternary ammonium cation 1 (see the Supporting Information (SI) for its preparation), 12 as it belongs to the important class of "Quat" cationic surfactants used as corrosion inhibitors, especially for carbon steel in acidic media. 13,14 Surfactants are amphiphilic molecules consisting of a hydrophilic head and a hydrophobic tail. 3 When a surfactant is adsorbed at the air−water interface, the hydrophilic headgroup is directed into the water layer and the hydrophobic tail points toward the air.…”

Comprehensive Study of the Action of Corrosion Inhibitors Based on Quaternary Ammonium Compounds in Solutions of Hydrochloric and Sulfamic Acids

“…It is believed [24] that the critical micelle concentration (CMC) is an important factor in determining the effect of surfactant inhibitor concentration on adsorption and corrosion retardation. The authors of scientific articles [25,26] determined that there is a maximum decrease in the corrosion rate with an increase in the inhibitor concentration to CMC.…”

Comparative study of corrosion inhibition by three anionic surfactants in an acidic environment

“…Carbon steel (i.e., an alloy of iron and carbon [Huyett, 2000]) is a less costly alternative to stainless steel, rendering it a common material in industrial plants (Pensini et al, 2018) and in the oil and gas industry (Zhu et al, 2016, 2017). Although carbon steel is widely used due to its low cost, it is susceptible to corrosion by a variety of chemical species, including CO 2 , O 2 , Cl − and H 2 S (Zhu, 2016; Zhu et al, 2017), as well as naphthenic acids (Deyab et al, 2007). These species are commonly found in crude oil and they can accumulate in water during closed loop cycles (in which water is reused over multiple cycles, for a sustainable use of water resources [Pensini et al, 2018]).…”

“…Carbon steel corrosion poses safety and economic concerns. In the United States, the costs associated with corrosion amounted to approximately $300 billion/year in 2007 (Thompson et al, 2007; U.S. Department of Transportation, 1998; Zhu, 2016). Carbon steel corrosion can cause fouling and unwanted plant shutdowns (Pensini et al, 2018), and it can contaminate process fluids in contact with carbon steel (Tribollet et al, 2014; Zhu et al, 2017; Zou et al, 2013).…”