Effect of sodium nitrite on chloride-induced corrosion of steel in concrete

Das, Jyotish Kumar; Pradhan, Bulu

doi:10.1016/j.matpr.2022.03.200

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…The inorganic corrosion inhibitors show outstanding inhibition effect on the occurrence of corrosion reaction by forming oxide layer or precipitation layer on metal surface 5,9 . Das and Pradhan 10 found that the nitrite oxidized the ferrous ions into highly insoluble and stable ferric oxide, which resulted in corrosion inhibition. Osipenko et al 11 observed inhibitive effect of sodium molybdate on corrosion of AZ31 magnesium alloy in chloride solutions.…”

Section: Introductionmentioning

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: Introductionmentioning

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

View full text Add to dashboard Cite

show abstract

“…However, when harmful media (carbon dioxide, chloride, sulfate, etc.) penetrate into the concrete, the internal environment pH drops and the passive film of the steel rebar may be damaged [ 4 , 5 ], resulting in corrosion of the steel rebar. Rust volume may be five times larger than that of un-corroded steel, so internal cracks may occur.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano-SiO2/PVA on Corrosion Behavior of Steel Rebar Embedded in High-Volume Fly Ash Mortar under Accelerated Chloride Attack

Huang

Wang

et al. 2022

Materials

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In this paper, the influence of Nano-silica (NS) and Polyvinyl alcohol (PVA) fibers on the corrosion behavior of steel rebar embedded in high-volume fly ash cement mortars under accelerated chloride attack was studied by using an impressed voltage technique. The PVA fibers used were 1.0 vol.%, and two mass fractions of cement (50 and 60 wt.%) were replaced by fly ash. Four NS mass fractions (0, 0.5, 1.0, and 1.5 wt.%) were utilized in this paper. In addition, the mono and hybrid effects of NS and PVA on the mechanical properties and water absorption of mortar were also studied. The results showed that the incorporation of PVA and nano-SiO2 can improve the flexural and compressive strengths of high-volume fly ash mortar. Generally, the flexural and compressive strengths increased with the increase of nano-SiO2 content. Moreover, the incorporation NS can also reduce the capillary water–absorption rate of cement mortar. The impressed voltage corrosion test indicated that the composite incorporation of nano-SiO2 and PVA can significantly delay the deterioration process of steel bars in mortar, effectively reducing the steel rebar’s corrosion level and increasing the exposure time of the surface crack. With hybrid-incorporation 1.0 vol.% PVA and 1.0 wt.% nano-SiO2, the steel rebar had the lowest corrosion degree, which exhibited a mass loss of 49% and increased the broken time by 71% as compared to the control mortar.

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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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Effect of sodium nitrite on chloride-induced corrosion of steel in concrete

Cited by 4 publications

References 13 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

Effect of Nano-SiO2/PVA on Corrosion Behavior of Steel Rebar Embedded in High-Volume Fly Ash Mortar under Accelerated Chloride Attack

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

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