Synthesis, characterization and the inhibition activity of 3-(4-cyanophenylazo)-2,4-pentanedione (L) on the corrosion of carbon steel, synergistic effect with other halide ions in 0.5 M H2SO4

Corrosion protection mechanism of Ce4+/organic inhibitor for AA2024 in 3.5% NaCl

“…The synergistic parameter ( S ) is an expression to compare the expected corrosion rate, when either A or B is present and does not interact, with the experimentally measured rate in the presence of the inhibitor mixture. The mathematical expression of synergism parameter, S , for a mixture of two inhibitors, A and B, is given in eqn (2) ; 80,81 where η A and η B are the inhibition efficiencies determined for compounds A and B respectively and η AB is the inhibition efficiency for the mixture A + B (concentrations of A and B in the mixture should be the same as in the corresponding separate situations). 50,53 The synergism between the two substances manifests itself when the value of S is greater than unity, whereas when S is less than unity the synergy is antagonistic.…”

“…49,50 The synergistic parameter (S) is an expression to compare the expected corrosion rate, when either A or B is present and does not interact, with the experimentally measured rate in the presence of the inhibitor mixture. The mathematical expression of synergism parameter, S, for a mixture of two inhibitors, A and B, is given in eqn (2); 80,81…”

Advancement of corrosion inhibitor system through N-heterocyclic compounds: a review

“…Planar alignment was observed for quinoline adsorption over the metal surface. It was observed that the values of adsorption energy impact the stability of inhibitor-metal interactions and here L1 experienced the most negative value compared to the other two derivatives which depicted the strongest sort of interactions exhibited by this [96,97].…”

Corrosion inhibition of amino acids for 316L stainless steel and synergistic effect of I− ions: Experimental and theoretical studies

“…[29,30] In addition, it is clear that both anodic and cathodic i corr values of steel protected by Lys or Arg are much smaller than those of exposed steel, indicating their inhibition effect on the cathodic and anodic reaction. [31] It is worth noting that the protection efficiency is improved more or less as the concentration of Lys or Arg increases, providing the best inhibition performance with 10 mM of Lys or 5 mM of Arg, respectively. The promotion of inhibition performance can be attributed to the formation of inhibition films of amino acids on the metal surface to separate the metal from corrosion medium and restrain reaction in process of corrosion.…”

“…At the same time, the decrease of CPE dl values suggests that amino acids would successfully adsorb on the steel surface by replacing pre-adsorbed water molecules. [31] More delightfully, the addition of Iions improves inhibition performance of Lys or Arg, leading to more outstanding IE of the former to 54.19% and the latter to 56.06%, respectively. Last but not least, steel with synergistic inhibition films has lower values of n than that covered by individual amino acids, which is possibly due to the increased roughness of the metal surface after further modification with I − ions.…”