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- Title
CORROSION INHIBITION OF COPPER IN ACID MEDIUM BY DRUGS: EXPERIMENTAL AND THEORETICAL APPROACHES.
- Authors
Shahraki, Mehdi; Habibi-Khorassani, Sayyed Mostafa; Noroozifar, Meissam; Yavari, Zahra; Darijani, Mahdieh; Dehdab, Maryam
- Abstract
The inhibition performances of nafcillin (III), methicillin (II) and penicillin G (I) on the corrosion of copper in HCl was studied and tested by weight loss, Tafel polarization, SEM, UV-vis spectrophotometry, molecular dynamics method and quantum chemical calculations. Polarization curves indicated that the studied inhibitors act as mixed-type inhibitors. The values of inhibition efficiency and surface coverage were found to follow the order: Blank <penicillin <methicillin <nafcillin. The maximum inhibition efficiency of 98.28% was exhibited by nafcillin, and the minimum inhibition efficiency of 43.10% was showed by penicillin. The adsorption of inhibitors obeys the Temkin adsorption isotherm. The negative value of free energy of adsorption ΔGads, indicated that the adsorption of three inhibitors was a spontaneous process. The SEM micrographs confirmed the protection of copper in a 1 M HCl solution by penicillin G, nafcillin, and methicillin. The shape of the UV/vis spectra of inhibitors in the presence of the immersion of Cu showed a strong support to the possibility of the chemisorbed layer formation on Cu surface by nafcillin (between nafcillin and Copper) and physisorption between penicillin and methicillin with copper. DFT calculations were performed to provide further insight into the inhibition efficiencies which were determined experimentally. Molecular dynamics (MD) simulations were applied to find the most stable configuration and adsorption energies of penicillin G, nafcillin and methicillin molecules on Cu (110) surface. The interaction energy followed the order: nafcillin (III)> methicillin (II)> penicillin G (I), which confirmed that nafcillin has the strongest interaction with the metal surface. The obtained results from experimental and theoretical methods were in reasonable agreement.
- Subjects
COPPER compounds; CORROSION &; anti-corrosives; ADSORPTION (Chemistry); MOLECULAR dynamics; METALLIC surfaces; DENSITY functional theory
- Publication
Iranian Journal of Materials Science & Engineering, 2017, Vol 14, Issue 4, p1
- ISSN
1735-0808
- Publication type
Article