Evaluation of Nitrate and Nitrite Reduction Kinetics Related to Liquid-Air-Interface Corrosion

Li, Xiaoji; Gui, Feng; Cong, Hongbo; Brossia, C. Sean; Frankel, G. S.

doi:10.1016/j.electacta.2013.11.136

Cited by 25 publications

(19 citation statements)

References 19 publications

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“…3b, it can be seen that with the increase of NO 2 − concentration in the CO 2 solution, the anodic current density in the active region increased more quickly, particularly in the range of 0.005 M to 0.05 M, suggesting that higher NO 2 − concentration accelerated the anodic processes, which is consistent with the EIS results. NO 2 − is an oxidizing agent and the following cathodic reactions in acidic solution may occur: 32,33,34,35 …”

Section: Resultsmentioning

confidence: 99%

The Passivation Behavior of Mild Steel in CO₂Saturated Solution Containing Nitrite Anions

Zhou

2014

J. Electrochem. Soc.

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The passivation behavior of mild steel in CO 2 saturated solution was studied with electrochemical methods and XPS. In CO 2 saturated solution at the open circuit potential, NO 2 − may accelerate corrosion of mild steel to some extent. By addition of NO 2 − in CO 2 saturated solution, the polarization behavior of mild steel changes from active dissolution to passivation. With the increase of NO 2 − concentration, during anodic polarization the current density increases faster and the active-passive transition potential moves to the negative direction. The passivation of mild steel is attributed to the formation of a protective Fe 2 O 3 passive film on the mild steel substrate under the FeCO 3 layer. NO 2− is a good corrosion inhibitor and passivation accelerator for carbon steels in alkaline and neutral environments, and the corrosion behavior of carbon steels can be obviously affected by the presence of NO 2 − in corrosion environments. 1-9 Reffass et al. 5 studied the effects of NO 2 − on localized corrosion behavior of carbon steel in NaHCO 3 + NaCl solution with the scanning vibrating electrode technique (SVET) and chronoamperometry. The authors found that the breakdown potential (E b ) of the steel moved positively from -15 ± 5 mV SCE up to 400 ± 50 mV SCE by addition of 0.1 M NO 2 − , and NO 2 − accelerated repassivation of the carbon steel surface and made the localized active sites lose their activity. Dong et al. 6,7 studied the relationship between the corrosion susceptibility and the semiconductive characteristics of the passive film on Q345 carbon steel in simulated carbonated concrete pore solution with the electrochemical noise (ECN) method. NO 2 − decreased the donor density in the passive film and caused E b to move toward the positive direction. The authors explained the effects of NO 2 − in two aspects: NO 2 − can promote repassivation of the localized active sites and repair the defective air-formed passive film. Valcarce et al. 8 investigated the effects of NO 2 − on the passivation behavior of steel bar in a mixed alkaline solution (KOH + NaOH + Ca(OH) 2 ) containing Cl − . NO 2 − was found to restrain the initiation and growth of localized corrosion and accelerate repassivation of the steel surface. The effect of NO 2 − in alkaline and neutral environments is attributed to the following reaction:The generated γ-Fe 2 O 3 by reaction 1 can repair the defective airformed passive film on the carbon steel surface, which strengthens the protection capacity of the passive film. [5][6][7][8][9][10] On the other hand, studies concerning the corrosion behavior of carbon steels in CO 2 environments have been carried out by many researchers. [11][12][13][14][15][16] The corrosion behavior of carbon steels is closely related to the composition and structure of the corrosion product layers, which depend mainly on the temperature of CO 2 environment. When the temperature is less than 60 • C, there is a thin and poorly adherent FeCO 3 layer, and uniform corrosion occurs in this temperature range. When the t...

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Section: Resultsmentioning

confidence: 99%

The Passivation Behavior of Mild Steel in CO₂Saturated Solution Containing Nitrite Anions

Zhou

2014

J. Electrochem. Soc.

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“…With the addition of 0.01 mol L -1 NaNO 2 in pH 1 to 5 HNO 3 solutions, the presence of NO 2 makes the following cathodic reactions available: [26][27][28] Because the E st of above reduction reaction concerning NO 2 -/HNO 2 (equation 8 to 11) is more positive than that of Fe 2+ oxidation (equation 7), the anodic reaction of Fe 2+ oxidation (equation 7) is possible if one or more of equations 8 to 11 occur on the X65 surface when a high potential was applied. However, the kinetic investigations and the E eq calculations are necessary to verify the real cathodic reactions of NO 2 -/HNO 2 reduction, which will be carried out in the future investigations.…”

Section: Resultsmentioning

confidence: 99%

The Comparative Investigation of Corrosion and Passivation for X65 Carbon Steel in pH 1 to 5 HNO3 Solutions without and with 0.01 mol L–1 NaNO2

Deng¹,

Zhang²,

Zhao³

et al. 2020

J. Braz. Chem. Soc.

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The influence of 0.01 mol L-1 NaNO 2 addition on the corrosion and passivation of X65 carbon steel in pH 1 to 5 HNO 3 solutions was investigated and compared by electrochemical methods and microstructural techniques. In the pH 1 to 5 solutions without NaNO 2 , the X65 steel presented the electrochemical characteristic of active dissolution, and the corrosion rate of X65 carbon steel decreased gradually with the raise of pH value. By contrast, with the addition of 0.01 mol L-1 NaNO 2 in pH 1 to 5 HNO 3 solutions, the electrochemical characteristic of X65 carbon steel transferred from the active dissolution in the pH 1 to 5 solutions without NaNO 2 to the anodic passivation in the corresponding pH solutions with NaNO 2. For the X65 steel in the pH 1 to 5 solutions with NaNO 2 , with the raise of pH value, the corrosion rate also decreased gradually but the passivation capability strengthened obviously. The corrosion and passivation of X65 carbon steel in pH 1 to 5 HNO 3 solutions without and with 0.01 mol L-1 NaNO 2 were related to the cathodic reactions of H + reduction, O 2 reduction and NO 2-/HNO 2 reduction.

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“…(1) 2H + + 2e → H 2 (2) It was reported that the cathodic process was accelerated when NO 2 − was present in acidic media, which was due to the following cathodic reaction: 26…”

Section: Nomentioning

confidence: 99%

The Effects of pH Values on Functional Mechanisms of Nitrite Anions for Q235 Carbon Steels in 0.01 mol L-1 NaNO2-HCl Solutions

Zhou

Zhang

Huang

et al. 2019

J. Braz. Chem. Soc.

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For Q235 carbon steels in 0.01 mol L-1 NaNO 2-HCl solutions with different pH values, the effects of pH values on the functional mechanisms of nitrite anions (NO 2 −) were studied. In the pH 1 and pH 2 solutions, the Q235 steels showed the electrochemical behavior of activation, and uniform corrosion (UC) was the main corrosion type on the Q235 surface. The presence of NO 2 − did not affect the electrochemical behavior and the corrosion type but only accelerated the anodic reaction of Fe oxidation. In the pH 3 and pH 4 solutions, the Q235 steels presented the electrochemical behavior of activation-passivation transition, and intergranular corrosion (IGC) occurred on the Q235 surface. The cathodic reaction of NO 2 − reduction resulted in the transition of electrochemical behavior from activation to passivation and the change of corrosion type from UC to IGC. In the pH 5 and pH 6 solutions, the Q235 steels exhibited the electrochemical behavior of self passivation-pitting, and pitting corrosion (PC) was present on the Q235 surface. The strong oxidability of NO 2 − played a critical role in the formation of γ-Fe 2 O 3 passive film on the Q235 surface under the combined action of Fe 2+ and NO 2 − .

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Evaluation of Nitrate and Nitrite Reduction Kinetics Related to Liquid-Air-Interface Corrosion

Cited by 25 publications

References 19 publications

The Passivation Behavior of Mild Steel in CO₂Saturated Solution Containing Nitrite Anions

The Passivation Behavior of Mild Steel in CO₂Saturated Solution Containing Nitrite Anions

The Comparative Investigation of Corrosion and Passivation for X65 Carbon Steel in pH 1 to 5 HNO3 Solutions without and with 0.01 mol L–1 NaNO2

The Effects of pH Values on Functional Mechanisms of Nitrite Anions for Q235 Carbon Steels in 0.01 mol L-1 NaNO2-HCl Solutions

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Evaluation of Nitrate and Nitrite Reduction Kinetics Related to Liquid-Air-Interface Corrosion

Cited by 25 publications

References 19 publications

The Passivation Behavior of Mild Steel in CO2Saturated Solution Containing Nitrite Anions

The Passivation Behavior of Mild Steel in CO2Saturated Solution Containing Nitrite Anions

The Comparative Investigation of Corrosion and Passivation for X65 Carbon Steel in pH 1 to 5 HNO3 Solutions without and with 0.01 mol L–1 NaNO2

The Effects of pH Values on Functional Mechanisms of Nitrite Anions for Q235 Carbon Steels in 0.01 mol L-1 NaNO2-HCl Solutions

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The Passivation Behavior of Mild Steel in CO₂Saturated Solution Containing Nitrite Anions

The Passivation Behavior of Mild Steel in CO₂Saturated Solution Containing Nitrite Anions