Effect of cations on the activity coefficient of NO2–/NO3– corrosion inhibitors in simulated concrete pore solution: An electrochemical thermodynamics study

Mohamed, Ahmed; Visco, Donald P.; Bastidas, David M.

doi:10.1016/j.corsci.2022.110476

Cited by 18 publications

(7 citation statements)

References 41 publications

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“…Then low‐soluble MoO 2 OH formed and adsorbed on corrosive material surface 11 . NaNO 2 enhanced the protective layer by oxidizing Fe 2+ released from the anodic of corrosive material to produce γ‐Fe 2 O 3 and γ‐FeOOH (reactions and ) 40,41 . Polytungstate ions would generate in solution involving H + through reactions ()–() and reacted with the blank orbit d of Fe in corrosive material to produce complexes and adhered to corrosive material surface to restrain corrosion 13 .…”

Section: Resultsmentioning

confidence: 99%

Study on the corrosion inhibition performance of composite inhibitor on carbon steel in stone processing wastewater

Xiang,

Lu,

Zhu

et al. 2023

Asia-Pacific J Chem Eng

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The circular saw blade, which is mainly composed of carbon steel, is used to cut the stone. However, the carbon steel is easily corroded in stone processing wastewater, shortening its lifespan. In this study, a new composite inhibitor of sodium nitrite, sodium molybdate, sodium silicate, sodium tungstate, and sodium citrate was investigated firstly, and then, its inhibition efficiency for carbon steel in stone processing wastewater was explored using electrochemical measurements and weight loss measurements. The results showed that the composite inhibitor as a mixed‐type inhibitor displayed good inhibitory performance. Surface analysis including scanning electron microscope, atomic force microscope, X‐ray photoelectron spectroscopy analysis, and contact angle test further revealed the form of protection of the steel surface by composite corrosion inhibitors. The prepared composite inhibitor exhibited excellent corrosion resistance for carbon steel in stone processing wastewater, and it is believed that the composite inhibitor has certain application potential in industries.

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Section: Resultsmentioning

confidence: 99%

Study on the corrosion inhibition performance of composite inhibitor on carbon steel in stone processing wastewater

Xiang,

Lu,

Zhu

et al. 2023

Asia-Pacific J Chem Eng

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“…EIS electrochemical testing was performed to understand the film formation and interphase inhibition of Na 3 PO 4 at the electrode/electrolyte interface. After recording the EIS plots, the validity and robustness of the EIS data was evaluated by using the Kramers−Kronig (KK) transforms, defined in Equations (4) and (5) [ 7 ]:

where Z real , Z img , ω, and x are the real impedance, imaginary impedance, frequency of the transform, and frequency of integration, respectively [ 17 , 18 ]. From the experimental and calculated impedance data values, the validity and robustness of the EIS can be verified.…”

Section: Resultsmentioning

confidence: 99%

“…This protective passive film effect can also be seen in the change of the R ct , where Na 3 PO 4 inhibited samples exhibited an order of magnitude increase, relative to the blank, at all concentrations achieving an IE of 68.6, 77.6, 85.4, and 88.6% for 0.05, 0.1, 0.3, and 0.6 M Na 3 PO 4 , respectively, corroborating the PDP results. An increased R ct indicates a hindered charge transfer process between the electrode/electrolyte interface due to the formation of the protective passive film [ 7 , 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…One of the most popular corrosion inhibitors, particularly for reinforced concrete, are nitrites (NO 2 − ), which are anodic corrosion inhibitors that oxidize ferrous ions forming a stable passive oxide film made up of maghemite (Fe 2 O 3 ) and lepidocrocite (γ–FeOOH) [ 5 , 6 ]. However, recently NO 2 − application has been limited in use due to ecological and environmental issues [ 5 , 7 ]. Some other alternatives include phosphate corrosion inhibitors as they are environmentally friendly [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption and Surface Analysis of Sodium Phosphate Corrosion Inhibitor on Carbon Steel in Simulated Concrete Pore Solution

2022

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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.

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“…Inhibitor surface coverage (θ) and corrosion inhibition efficiency (IE) values were calculated using eqs and , respectively C R = C R 0 − C R i C normalR 0 × 100 θ = C R 0 − C R i C normalR 0 where C R 0 and C R i reflect the corrosion rates with and without inhibitors, respectively.…”

Section: Methodsmentioning

confidence: 99%

Corrosion Prevention of Copper in 2.0 M Sulfamic Acid Using Novel Plant Extract: Chemical, Electrochemical, and Theoretical Studies

Salem,

Al-Sharif

2023

ACS Omega

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Copper corrosion was suppressed when a lupine extract was immersed in a 2 M sulfamic acid (H 2 NSO 3 H) solution. Numerous methods, including mass loss (ML), dynamic potential polarization (PL), and electrochemical impedance (EIS), were employed in these experiments, in addition to theoretical computations such as density functional theory (DFT), Fukui function, and Monte Carlo simulations. Fourier transform infrared (FT-IR) spectroscopy and scanning electron microscopy (SEM) were used to analyze the Cu surface’s composition and determine its form. Mass loss (ML) was used to examine the inhibition rate of copper corrosion in sulfamic acid at 25 °C in the presence of lupine extract. After examining how it behaved throughout the adsorption process on copper, it was discovered that it follows the Langmuir isotherm and chemical adsorption. An analysis of the PL curves indicates that the lupine extract is a mixed-type inhibitor. It was shown that the inhibitory efficiency increased to 84.2% with increasing lupine concentration. Additionally, as the data show, the efficiency of inhibitors is diminished by increasing temperatures. Theoretical calculations and experimental data were compared using Monte Carlo simulation (MC) and density functional theory (DFT).

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Effect of cations on the activity coefficient of NO2–/NO3– corrosion inhibitors in simulated concrete pore solution: An electrochemical thermodynamics study

Cited by 18 publications

References 41 publications

Study on the corrosion inhibition performance of composite inhibitor on carbon steel in stone processing wastewater

Study on the corrosion inhibition performance of composite inhibitor on carbon steel in stone processing wastewater

Adsorption and Surface Analysis of Sodium Phosphate Corrosion Inhibitor on Carbon Steel in Simulated Concrete Pore Solution

Corrosion Prevention of Copper in 2.0 M Sulfamic Acid Using Novel Plant Extract: Chemical, Electrochemical, and Theoretical Studies

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