Materials, 2022-10, Vol.15 (21), p.7429
2022
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- Autor(en) / Beteiligte
- Titel
- Adsorption and Surface Analysis of Sodium Phosphate Corrosion Inhibitor on Carbon Steel in Simulated Concrete Pore Solution
- Ist Teil von
- Materials, 2022-10, Vol.15 (21), p.7429
- Ort / Verlag
- Basel: MDPI AG
- Erscheinungsjahr
- 2022
- Quelle
- Free E-Journal (出版社公開部分のみ）
- Beschreibungen/Notizen
- Corrosion of steel-reinforced concrete exposed to marine environments could lead to structural catastrophic failure in service. Hence, the construction industry is seeking novel corrosion preventive methods that are effective, cheap, and non-toxic. In this regard, the inhibitive properties of sodium phosphate (Na3PO4) corrosion inhibitor have been investigated for carbon steel reinforcements in 0.6 M Cl− contaminated simulated concrete pore solution (SCPS). Different electrochemical testing has been utilized including potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and Mott-Schottky plots to test Na3PO4 at different concentrations: 0.05, 0.1, 0.3, and 0.6 M. It was found that Na3PO4 adsorbs on the surface through a combined physicochemical adsorption process, thus creating insoluble protective ferric phosphate film (FePO4) and achieving an inhibition efficiency (IE) up to 91.7%. The formation of FePO4 was elucidated by means of Fourier-transform infrared spectroscopy (FT–IR) and X-ray photoelectron spectroscopy (XPS). Quantum chemical parameters using density functional theory (DFT) were obtained to further understand the chemical interactions at the interface. It was found that PO43− ions have a low energy gap (ΔEgap), hence facilitating their adsorption. Additionally, Mulliken population analysis showed that the oxygen atoms present in PO43− are strong nucleophiles, thus acting as adsorption sites.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 1996-1944eISSN: 1996-1944DOI: 10.3390/ma15217429Titel-ID: cdi_doaj_primary_oai_doaj_org_article_5e04395046054286a9b783917f006386
- Format
- –
- Schlagworte
- Adsorption, Carbon steel, Carbon steels, Catastrophic failure analysis, Cathodic corrosion, Cathodic protection, Chemical inhibitors, Construction industry, Corrosion, corrosion inhibitor, Corrosion inhibitors, Corrosion potential, Density functional theory, density functional theory (DFT), Electrochemical impedance spectroscopy, electrochemical impedance spectroscopy (EIS), electrochemistry, Electrode polarization, Electrodes, Energy gap, Fourier transforms, Infrared spectroscopy, Marine environment, Microscopy, Nucleophiles, Offshore structures, Oxygen atoms, phosphate, Phosphates, Photoelectrons, Quantum chemistry, Reinforced concrete, Reinforcing steels, Sodium phosphate, Steel, Surface analysis (chemical), Surface chemistry, X ray photoelectron spectroscopy