Evaluation of chitosan and carboxymethyl cellulose as ecofriendly corrosion inhibitors for steel

Effect of CO2 Partial Pressure on the Corrosion Inhibition of N80 Carbon Steel by Gum Arabic in a CO2-Water Saline Environment for Shale Oil and Gas Industry

“…The literature reports that GA [ 7 , 21 ], and in general polysaccharides-like inhibitors [ 15 , 20 ], is mainly adsorbed on the metal surface in acidic condition by weak electrostatic interaction between the protonated inhibitor molecules and the chloride ions adsorbed on the metal surface. In a weak acid solution GA molecules are in equilibrium with their protonated molecules according to the following reaction (see also Section 3.5.1 ) [ 7 ]: where is the protonated inhibitor in the solution.…”

“…Another possible reason may be due to the fact that these types of inhibitors get absorbed via electrostatic interactions (e.g., van der Waal forces) onto the surface of the metal, and it is known that this types of interaction generally grow weaker with an increase in temperature due to larger thermal motion [ 3 , 20 ]. Consequently, an increase in temperature will increase the metal surface kinetic energy, which has a detrimental effect on the adsorption process and encourages desorption processes [ 15 , 20 ].…”

“…Nitrogen-based compounds such as pyridine derivatives [ 11 ] imidazolines [ 12 ], benzimidazole derivatives [ 13 ], and amines [ 14 ] were found to be effective corrosion inhibitors against CO 2 corrosion. However, most of these compounds are reported to be toxic and their synthesis can be very expensive [ 15 , 16 ]. These drawbacks and the increase in environmental awareness have led many researchers to focus on the use of more naturally occurring substances as corrosion inhibitors.…”

“…Umoren et al [ 15 ] studied the corrosion inhibition effect of two naturally occurring polymers such as carboxymethyl cellulose and chitosan for API 5 L X60 steel in a CO 2 saline solution at = 1 bar. The results showed that both inhibitors reduced the corrosion rate of the metal due to the formation of a protective layer on its surface.…”

The Electrochemical Variation of a Kind of Protein Staining and Food Dye as a New Corrosion Inhibitor on Mild Steel in Acidic Medium

“…where 55.5 is the molar concentration of water, R is the universal gas constant, and T is temperature in Kelvin. Literature researches uncover that the values of Δ ∘ around -20 kJ/mol or less negative than are convenient with the electrostatic interaction between the charged inhibitor molecules and the charged metal surface (physisorption) and those around -40 kJ/mol or more negative (Table 3) than included sharing or charge transfer of electrons between inhibitor molecules and the surface of mild steel to constitute bond of a coordinate type (chemisorption) [45,46]. In this study, all Δ ∘ values calculated (Table 3) for each immersion times are largely more negative than -40 kJ/mol and incorporate chemisorption, charge sharing between inhibitor, and metal surface.…”