Experimental and computational studies of two antibacterial drugs as corrosion inhibitors for mild steel in acid media

Abstract

The inhibition of mild steel corrosion in 3% HCl solution by sulfamethoxazole (SZ) and norfloxacin (NF) were investigated at 25 8C using weight loss measurement. The measurements reveal that the inhibition efficiency grows with increasing concentrations of inhibitors, and the inhibition efficiency decreases in the order NF > SZ. The adsorption of inhibitor molecule on mild steel surface follow Langmuir isotherm. Quantum chemical calculation was performed to correlate electronic structure parameters of SZ and NF with their inhibition performances. The molecular dynamics simulations were applied to find the equilibrium adsorption configurations and calculate the interaction energy between inhibitors and iron surface. The efficiency order of the studied inhibitors obtained by experimental results was verified by theoretical calculations.

Multidimensional insights involving electrochemical andin silicoinvestigation into the corrosion inhibition of newly synthesized pyrazolotriazole derivatives on carbon steel in a HCl solution

“…Therefore, the change in the C dl values originated from the gradual displacement of the water molecules by the adsorption of the corrosion inhibitors on the iron surface, decreasing the extent of metal dissolution. 33 Overall, the corrosion inhibition performances obtained from the EIS measurements are in good agreement with those obtained from PDP.…”

Synergistic effect of halide ions and gum arabic for the corrosion inhibition of API5L X70 pipeline steel in H2SO4

“…In order to reduce the undesirable carbon steel dissolution by these processes and as the most effective and economic method, corrosion inhibitors are widely employed . The new generation of environmental regulation requires the replacement of toxic inhibitors with non‐toxic inhibitors . In view of this, many alternative ecofriendly corrosion inhibitors have now been developed.…”

Adsorption and corrosion inhibition properties of pyridine‐2‐aldehyde‐2‐quinolylhydrazone for Q235 steel in acid medium: Electrochemical, thermodynamic, and surface studies

“…A good solution to this problem is to use corrosion inhibitors due to their excellent inhibition efficiency and considerable economic benefit. The reported inhibitors against steel corrosion in acidic medium are usually heterocyclic organic compounds containing highly electronegative atoms in their molecular structures, such as nitrogen, oxygen, sulfur, phosphorus, unsaturated bonds, or large conjugation system . Singh et al reported that quinoline derivatives with different substituent groups (e.g., hydroxyl, sulfhydryl, amino, and phenyl) on the quinoline ring could inhibit the Q235 steel corrosion in acidic medium, in which the corrosion inhibition occurs due to the adsorption of inhibitor molecules on the steel surface and the differences in the inhibition properties were attributed to the different molecular structures of inhibitors.…”