Inhibition Effect of Sodium Nitrite and Silicate on Carbon Steel Corrosion in Chloride-Contaminated Alkaline Solutions

Girčienė, O.; Ramanauskas, R.; Gudavičiūtė, L.; Martušienė, A.

doi:10.5006/1.3665355

Cited by 19 publications

(5 citation statements)

References 39 publications

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“…According Giréienë, the outer layer of the film consists of FeO. AFM analysis demonstrated that the film formed in presence of nitrite ions is less porous and more compact than those formed on Ca(OH) 2 without inhibitor [35]. FTIR spectra seem to confirm the decrease of -OH groups in the outermost layer of the film, in the presence of nitrite.…”

Section: Ftir Spectra Fourier Transform Infrared Spectroscopymentioning

confidence: 96%

Effect of Organic Inhibitors on Chloride Corrosion of Steel Rebars in Alkaline Pore Solution

Cabrini

Fontana

Lorenzi

et al. 2015

Journal of Chemistry

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The inhibition properties of aspartic and lactic acid salts are compared with nitrite ions with regard to their effect on critical chloride concentration. The tests were carried out on carbon steel specimens in simulated pore solutions with initial pH in the range of 12.6 to 13.8. The critical chloride concentrations were estimated through multiple specimen potentiostatic tests at potentials in the usual range for passive rebar in noncarbonated concrete structures. During tests, chloride ions were progressively added until all specimens showed localized attack, obtaining cumulative distribution curves reporting the fraction of corroded specimens as a function of chloride concentration. The presence of the organic inhibitors on the passivity film was detected by IR spectra. The results confirm that 0.1 M aspartate exhibits an inhibiting effect comparable with nitrite ions of the same concentration. Calcium lactate does not increase critical chloride concentration; however it appears to promote the formation of a massive scale, reducing the corrosion propagation.

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Section: Ftir Spectra Fourier Transform Infrared Spectroscopymentioning

confidence: 96%

Effect of Organic Inhibitors on Chloride Corrosion of Steel Rebars in Alkaline Pore Solution

Cabrini

Fontana

Lorenzi

et al. 2015

Journal of Chemistry

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“…Early publications with promising results for their use in concrete structures include the work by Duffek and McKinney [22], that by Armstrong and Zhou [23] as well as one by Chen et al [24], where the performance of silicate ions as an inhibiting agent was compared to that of molybdate ions. More recent studies by Girciene et al [25] and Mohorich et al [26] combined silicate ions with nitrite and chloride ions and with bicarbonate to simulate different environments, always with positive results. Along these lines, in a previous study [27], we focused on evaluating silicate ions as inhibitors in chloride-contaminated solutions that simulate concrete.…”

Section: Introductionmentioning

confidence: 99%

Pre-treatments in silicate solutions to mitigate reinforcing steel corrosion in chloride-contaminated environments

Rolandi

Montes

Ayala

et al. 2022

Corrosion Engineering, Science and Technology

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Silicate ions were incorporated into a pre-treatment to mitigate corrosion in reinforcing steel bars. The efficiency of these pre-treatments was compared by testing steel samples in concrete pore simulating solutions contaminated with chloride ions. The study involved cyclic voltammetry, anodic polarisation curves and weight-loss tests following a 60-day immersion period. Surface analysis included micro-Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The electrical properties of the film were analyzed by impedance spectroscopy and Mott-Schottky plots. Polarisation curves show higher pitting potentials and lower corrosion current densities when pre-treating with silicate ions. Localised attack appears after 60 days of immersion in solutions containing chloride ions, but weight loss is reduced by 75% for coupons pre-treated in silicate solutions. XPS and Raman spectra indicate that the presence of silicate ions affects the composition of the passive film and the corrosion products. The results show that pretreatments in silicate solutions are effective to minimise steel corrosion in aggressive environments.

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“…However, the carbonation of concrete and the penetration of Cl − may cause breakdown of the passive film easily, resulting in significant corrosion of the reinforcing steel [1][2][3][4][5][6][7] . In order to mitigate or ultimately eliminate the corrosion of reinforcing steel in concrete, many methods for corrosion protection have been used, including uses of protective coatings 8,9 , cathodic protection 1,10 and applications of corrosion inhibitors [11][12][13][14][15] . Among them, the use of corrosion inhibitors is a very promising method because it is effective, inexpensive and easy-to-operate.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, the use of corrosion inhibitors is a very promising method because it is effective, inexpensive and easy-to-operate. Mixed corrosion inhibitors are usually more effective than a single inhibitor due to the complexity of actual reinforced concrete systems 1,15 . Therefore, it is of practical significance to develop advanced mixed corrosion inhibitors.…”

Section: Introductionmentioning

confidence: 99%

Effect of an Environmentally Friendly Diisooctyl Sebacate-based Mixed Corrosion Inhibitor on Reinforcing Steel

Guo¹,

Jin²,

Shao³

et al. 2020

Acta Phys Chim Sin

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Corrosion protection of reinforcing steel in concrete is an urgent task in modern society. Use of corrosion inhibitors in concrete is an effective, simple, and economical method for protecting reinforcing steel from corrosion. Mixed corrosion inhibitors usually perform better than a single inhibitor in actual reinforced concrete systems because of their synergistic inhibition effects. In recent years, environmentally friendly corrosion inhibitors have attracted increasing attention from corrosion researchers. Diisooctyl sebacate and sodium D-gluconate are environmentally friendly organic corrosion inhibitors, and ZnSO4 is an inorganic cathodic inhibitor, they may form an innovative, nontoxic, and pollution-free mixed corrosion inhibitor to control reinforcing steel corrosion. Additionally, diisooctyl sebacate and sodium D-gluconate serve as absorption-type inhibitors, and ZnSO4 acts as a precipitation-type inhibitor. We hypothesized that their combination might show a good synergistic corrosion inhibition effect on reinforcing steel. In this study, we developed a diisooctyl sebacate-based mixed corrosion inhibitor that includes D-gluconate and ZnSO4 and investigated its synergistic inhibition effects on reinforcing steel (Q235 steel) corrosion in a simulated polluted concrete pore solution. The reinforcing steel corrosion behavior and the properties of the mixed corrosion inhibitor were studied by polarization curve measurements, electrochemical impedance spectroscopy tests, and surface analysis methods (scanning electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy). The results indicated that the reinforcing steel in the simulated polluted concrete pore solution (pH 11.00, 0.5 mol•L −1 NaCl) was in an active dissolving state and that localized corrosion took place. The mixed corrosion inhibitor, consisting of diisooctyl sebacate (59 mmol•L −1 ), sodium D-gluconate (0.5 mmol•L −1 ), and ZnSO4 (1.5 mmol•L −1 ), had an obvious and powerful inhibition effect. Its inhibition efficiency reached 96.8% and 90.0% in the simulated polluted concrete pore solution and the cement mortar, respectively. The mixture of diisooctyl sebacate with sodium D-gluconate and ZnSO4 acted as a mixed-type inhibitor and effectively controlled both anodic and cathodic reactions of the steel corrosion.

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Inhibition Effect of Sodium Nitrite and Silicate on Carbon Steel Corrosion in Chloride-Contaminated Alkaline Solutions

Cited by 19 publications

References 39 publications

Effect of Organic Inhibitors on Chloride Corrosion of Steel Rebars in Alkaline Pore Solution

Effect of Organic Inhibitors on Chloride Corrosion of Steel Rebars in Alkaline Pore Solution

Pre-treatments in silicate solutions to mitigate reinforcing steel corrosion in chloride-contaminated environments

Effect of an Environmentally Friendly Diisooctyl Sebacate-based Mixed Corrosion Inhibitor on Reinforcing Steel

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