Inhibition mechanism of nitrite on the corrosion of carbon steel in simulated cooling water systems

Khani, Hosein; Arefinia, Reza

doi:10.1002/maco.201709735

Cited by 18 publications

(4 citation statements)

References 48 publications

(116 reference statements)

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“…Usually film forming inhibitors get adsorbed to the metal and R s tends to decrease. In case of NaNO 2 , it is generally considered anodic inhibitor which helps in forming the thin protective layer of oxide on the copper surface 30 . This implies that due to this oxide barrier on surface, the ion transfer between copper and bulk solution decreases each time the inhibitor concentration is increased that results in increasing R s .…”

Section: Resultsmentioning

confidence: 99%

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Sodium nitrite as a corrosion inhibitor of copper in simulated cooling water

Rizvi

Gerengi

Uygur

et al. 2021

Sci Rep

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The corrosion inhibition behavior of sodium nitrite (NaNO2) towards pure copper (99.95%) in simulated cooling water (SCW) was investigated by means of electrochemical impedance spectroscopy (EIS) and dynamic electrochemical impedance spectroscopy (DEIS). NaNO2 interferes with metal dissolution and reduce the corrosion rate through the formation or maintenance of inhibitive film on the metal surface. Surface morphologies illustrated that the surface homogeneity increased on adding sodium nitrite. Sodium nitrite’s adsorption on copper surface followed the modified form of Langmuir, Freundlich and Frumkin isotherms. Physiosorption mode was involved in the corrosion protection. Electrochemical results revealed an corrosion resistance of copper increases on increasing the inhibitor concentration. The DEIS results indicated that copper corrosion mechanism could be hindered by 50% even after interval of 24 h by optimum concentration of sodium nitrite. The maximum inhibition was achieved with 2000 ppm of NaNO2. With this concentration, inhibition efficiency of up to 61.8% was achievable.

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Section: Resultsmentioning

confidence: 99%

“… These O 2− ions oxidize cuprous ions to cupric. In an alkaline solution, stable passive film of CuO/Cu (OH) 2 forms on the metal surface 30 .…”

Section: Introductionmentioning

confidence: 99%

Sodium nitrite as a corrosion inhibitor of copper in simulated cooling water

Rizvi

Gerengi

Uygur

et al. 2021

Sci Rep

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show abstract

“…Inorganic inhibitors, such as tungstates, 14 molybdates, 15 and phosphates, 16 and organic inhibitors, such as 2-mercatobenzothiazole (MBT), 16 N-benzyl-p-toluene sulfonamide (BTS), 17 and thiazolyl blue tetrazolium bromide (MTT) 18 , have been confirmed to exert a high corrosion-inhibition effect due to two factors: absorption of Cland release of the inhibitor. Regarding NO 2 -, which has been used as an inhibitor for a long time, 6,[19][20][21][22][23][24] Xu et al…”

Section: Accepted M M a N U mentioning

confidence: 99%

Corrosion Inhibition for Steel Surface Using a Polyacrylic Gel Sheet Containing Ni–Al Layered Double Hydroxide Prepared by Liquid-Phase Deposition

et al. 2021

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“…Nitrites (NO 2 -) have been widely used in the inhibition of corrosion of reinforced concrete and numerous studies have examined its use in both simulated concrete pore solutions and real concrete samples [14][15][16][17][18]. Nitrite has been shown to be a corrosion inhibitor for steel in neutral and alkaline pH but can accelerate corrosion in acidic media [19].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and DFT Study of NaNO2/NaNO3 Corrosion Inhibitor Blends for Rebar in Simulated Concrete Pore Solution

et al. 2022

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The use of nitrite- and nitrate-based inhibitors provides corrosion protection by the development of passive oxide film on the metal surface in reinforced concrete applications. However, the impact of the nitrite and nitrate ratio in the mixture has not been widely studied. In this study, the corrosion protection provided by NaNO2:NaNO3 inhibitor blends with ratios of 0.5:1, 1:1, and 1:0.5 were studied to maximize corrosion inhibition efficiency. The nitrite species imparted higher corrosion protection, as shown by cyclic potentiodynamic polarization, with an icorr of 1.16 × 10–7 A/cm2 for the 1:0.5 mixture, lower than for both the 1:1 and 0.5:1 mixtures. Electrochemical impedance spectroscopy was also performed, with the 1:0.5 mixture consistently displaying high resistance values, showing an Rct of 1.31 × 105 Ω cm2. The effect of temperature was also assessed; the Ea’s of the corrosion reaction were calculated to be 12.1, 9.2, and 4.9 kJ/mol for the 0.5:1, 1:1, and 1:0.5 (NO2−:NO3−) mixtures, respectively. Density functional theory was applied to analyze the molecular properties and to determine the relationship between the quantum properties and corrosion inhibition. The ΔE of NO2− was found to be −5.74 eV, lower than that of NO3− (−5.45 eV), corroborating the experimental results. Lastly, commercially available inhibitor mixtures were investigated and nitrite/nitrate concentrations determined to evaluate their corrosion protection performance; amongst the two inhibitor blends tested, Sika was found to outperform Yara due to its greater NO2− concentration.

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Inhibition mechanism of nitrite on the corrosion of carbon steel in simulated cooling water systems

Cited by 18 publications

References 48 publications

Sodium nitrite as a corrosion inhibitor of copper in simulated cooling water

Sodium nitrite as a corrosion inhibitor of copper in simulated cooling water

Corrosion Inhibition for Steel Surface Using a Polyacrylic Gel Sheet Containing Ni–Al Layered Double Hydroxide Prepared by Liquid-Phase Deposition

Electrochemical and DFT Study of NaNO2/NaNO3 Corrosion Inhibitor Blends for Rebar in Simulated Concrete Pore Solution

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