Electrochemical and theoretical studies on the synergistic interaction and corrosion inhibition of alkyl benzimidazoles and thiosemicarbazide pair on mild steel in hydrochloric acid

Corrosion inhibition of carbon steel in 1 M H2SO4 solution by Thapsia villosa extracts

“…5 that g w % increases with the increase in EAE and BE concentration, while it decreased with increase in temperature. This can be attributed to increased rate of desorption of phytochemical compounds from the surface of CS with increasing temperature because these two opposite processes are in equilibrium [26,27]. Several authors have reported similar observation and the plant extracts were believed to be physically adsorbed on the CS surface [26,28,29].…”

“…Hence, the gain in entropy is attributed to the increase in solvent entropy and to more positive water desorption enthalpy [26]. The positive values of the entropy, related to substitutional adsorption, can be attributed more to the increase of adsorbed inhibitor molecules rather than the decrease of water molecule desorption [41].…”

Experimental and theoretical studies of 5-((4-phenyl-4,5-dihydro-1H-tetrazol-1-yl)methyl)-quinolin-8-ol quinoline derivative as effective corrosion inhibitor for mild steel 1.0 HCl

“…When ΔE decreases, the reactivity of the inhibitor to the iron surface increases [44,45]. According to Table 5, the high value of E HOMO , lower value of E LUMO and a small ΔE indicates a higher interaction between the metal surface and inhibitor molecules [46,47]. However, the higher dipole moment (μ) value of PTQ8 suggested that it has a stronger dipole-dipole interaction with mild steel [48].…”

Enhanced corrosion inhibition effect of polypropylene glycol in the presence of iodide ions at mild steel/sulphuric acid interface

“…It is evident from Table 1 that values in the 256 presence of PPG are lower compared to that of the blank solution 257 indicating that the polymer actually inhibited the metal corrosion 258 in the acid corrosive medium. For instance, 1000 ppm PPG has i corr 259 value of 89 mA/cm 2 compared to the blank solution with the at 298 K. The Nyquist diagrams are characterized by 265 depressed capacitive loops which suggest that the dissolution of 266 mild steel in the acidic medium is mainly controlled by charge 267transfer process[28,29]. It is clear from the Nyquist plots that the 268 capacitive loops are not perfect but depressed with center below 269 the real axis.…”

“…Also, polymers which many researchers [10][11][12][13][14] have 25 advocated as possible replacement for organic metal corrosion 26 inhibitors due to their low prices and environmental friendliness in 27 addition to multiple adsorption centers appear to only moderately 28 inhibit metal corrosion. 29 One of the steps taken by corrosion scientists to address the 30 aforementioned challenges in recent times has been finding 31 substances that can exert synergistic effect when combined with 32 inhibitor such that the quantity of an expensive inhibitor could be 33 reduced or the efficiency of a moderately performed inhibitor 34 enhanced. Both cations and anions have been found to exert 35 synergistic influence with organic species.…”