Synergistic effect of iodide ions on the corrosion inhibition of steel in 0.5M H2SO4 by new chalcone derivatives

Synergistic Effect of Different Salts on the Inhibition Efficiency of a Cationic Surfactant on Steel Corrosion in Acid Medium

“…The inhibitors are then adsorbed by columbic attraction on the metal surface where the halide ions are already adsorbed by chemisorptions. Stabilization of adsorbed halide ions with inhibitor in cation forms, leads to greater surface coverage and thereby greater inhibition (29). + ions which are studied in this paper may be mainly due to the blocking of the free iron surface for the cathodic complementary hydrogen evolution reaction and decreasing the overall corrosion rate (37).…”

“…Thus it can be concluded that anions are initially adsorbed on the metal surface and inhibitors in forms of ions are then adsorbed by the columbic attraction on the metal surface, where the anions are already chemisorbed. Thus the presence of salts suppresses the corrosion rate by stabilizing the adsorbed anion layer and by increasing the surface coverage (29).…”

“…When halide salts are added to in surfactant inhibitor solution, it is reported that there in synergistic effect between halide anions and surfactant molecules (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29). Halide ions, specially, fluoride (25), chloride (20,25,27), bromide (25,27) and iodide (18,19,(21)(22)(23)(24)(25)(26)(27)(28)(29) increase the inhibition efficiency of surfactant in acid medium. It is an effective means to improve the performance of inhibitors, to decrease the amount of usage and reduce the cost (20).…”

“…Some literatures (11,(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29) reported that the negative charge on metal surface can increase in presence of inorganic anions such as anions of cationic surfactants. This negative charge helps cationic surfactant molecule be easily adsorbed on the surface.…”

Corrosion Inhibition of Mild Steel in 1 M H2SO4 by Polyvinyl Pyrrolidone and Synergistic Iodide Additives

“…It is thought that the initial specific adsorption of the halide ions on the metal surface facilitates the adsorption of organic cations by forming intermediate bridges between the positively charged metal surface and the positive end of the inhibitor. A few reports from our laboratory highlighted the synergistic effect of halide ions on the corrosion of mild steel in acidic solution [15][16][17], while the synergistic inhibition between organic compounds and iodide ions has been reported by some research groups [18][19][20][21][22]. However, reports on synergistic influence of halide ions and polymers are very scanty [23,24].…”