Inhibition Effects Of Some Novel Surfactants Based On Corn Oil And Diethanolamine On Mild Steel Corrosion In Chloride Solutions Saturated With CO2

Abstract

Novel surfactants were synthesized based on corn oil and diethanolamine and its inhibiting action on the corrosion of mild steel in CO 2-saturated NaCl solutions was investigated by means of linear polarization resistance corrosion rate and polarization methods The results revealed that the investigated surfactants were an excellent inhibitors and the inhibition efficiencies obtained from two methods were in good agreement. The maximum inhibition efficiency was observed for inhibitor II (99.5 at 50 ppm). Polarization studies clearly revealed that the surfactants acted essentially as the mixed-type inhibitor. Thermodynamic parameters were obtained from polarization studies, which suggested that the adsorption of studied surfactants on metal surface obeyed Langmuir adsorption isotherm model.

Synergistic effect of polyethylene glycols and rare earth Ce4+ on the corrosion inhibition of carbon steel in sulfuric acid solution: electrochemical, computational, and surface morphology studies

“…The results obtained from the potentiodynamic polarization studies were fit using different adsorption isotherms, such as those of Langmuir, Frumkin, Temkin, and Freundlich. Adsorption of PEG(I) and PEG(II) was found to obey the Langmuir adsorption equation of the form [49,50] Synergistic effect of polyethylene glycols and rare earth… where C inh. , K ads , and h are the concentration of the inhibitors, the equilibrium constant of the adsorption/desorption process, and the degree of surface coverage, respectively.…”

Enhanced corrosion inhibition of mild steel in CO2-saturated solutions containing some novel green surfactants based on cottonseed oil

“…The value 55.5 in the above equation was the molar concentration of water in solution in mol/L [7]. The relatively high value of the adsorption equilibrium constant (K ads ; Table 5) reflects the high adsorption ability of these inhibitors on the electrode surface [35].…”

“…The second region locates at higher surfactant concentrations where the surface tension values are almost stable. The intercept of these two regions gave the critical micelle concentration, CMC values [7]. It can be seen that the critical micelle concentration of S I is 3.2×10 -3 mol/l.…”

“…The use of inhibitors is one of the most practical methods for protection against corrosion [6][7][8][9][10]. To be effective, an inhibitor must also transfer water from the metal surface, interact with anodic or cathodic reaction sites to retard the oxidation and reduction corrosion reaction, and prevent transportation of water and corrosion-active species on the metal surface.…”

Some surfactants based on the vegetable oils as CO2 corrosion inhibitors for mild steel in oilfield formation water

“…It has been acknowledged that CO 2 corrosion is one of major corrosion types resulting in oil well failure [1]. Due to the complexity of environment in oil well, CO 2 corrosion is dependent on various environmental conditions like temperature, CO 2 partial pressure, flow conditions and protective corrosion scales [2][3][4][5][6][7]. Corrosion inhibitors are the most effective and flexible mean of corrosion control in oil and gas production systems, but the selection and application of inhibitors are actually complicated because of the variable corrosive environments in these systems [8].…”