The inhibitive mechanisms of nitrite and molybdate anions on initiation and propagation of pitting corrosion for mild steel in chloride solution

Zhou, Yong; Zuo, Yu

doi:10.1016/j.apsusc.2015.07.037

Cited by 71 publications

(31 citation statements)

References 41 publications

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“…It was reported that for the occurrence of PC on the surface of carbon steels, the formation of passive film on the steel surface and the presence of aggressive anions in the service environment were two essential factors. 12 In this work, for the Q235 steels in the pH 5 and 6 NaNO 2 -HCl solutions, the above two factors are present. 30, No.…”

Section: Nomentioning

confidence: 90%

“…8 At present, the studies on the inhibitive effect and mechanism of NO 2 − for carbon steels are mainly focused on alkaline and neutral media, particularly on the corrosion environments of reinforced concrete [9][10][11] and chloride. [12][13][14] It is generally accepted that in alkaline and neutral media, the presence of NO 2 − promotes the surface passivation of carbon steels, which is attributed to the mechanism of NO 2 − for repairing the defects in the air-formed oxide film and making the oxide film to grow and re-arrange towards a regular passive film. 8,11,13 However, in acidic media, the related studies involving NO 2 − are relatively few, and the present studies are summarized as follows.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Nomentioning

confidence: 90%

Section: Introductionmentioning

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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“…It was also reported that tungstate lacked the oxidizing property of both chromate and nitrite [ 9 ]. Many authors published their results for the inhibiting effect of molybdate [ 10 , 11 , 12 , 13 , 14 ]. Molybdate is an environment-friendly anodic passivation inhibitor.…”

Section: Introductionmentioning

confidence: 99%

“…Molybdate is an environment-friendly anodic passivation inhibitor. The inhibition mechanism of molybdate has been studied by many scholars, and competitive adsorption [ 10 ], adsorption film [ 11 , 12 ], and oxidation [ 13 ] are the dominant views. Molybdate acts as a localized corrosion inhibitor, which is effective in the first stages of pitting initiation, and the effectiveness is decreased after the propagation stage is established [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Synergistic Corrosion Inhibition Effect between Calcium Lignosulfonate (CLS) and Inorganic Inhibitors on Q235 Carbon Steel in Alkaline Environment with Cl−

et al. 2020

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The synergistic corrosion inhibition effect between calcium lignosulfonate (CLS) and three kinds of inorganic inhibitors (Na2MoO4, Na2SnO3, and NaWO4) with various molar ratios on Q235 carbon steel in alkaline solution (pH 11.5) with 0.02 mol/L NaCl was investigated by cyclic potentiodynamic polarization, electrochemical impedance spectroscopy, linear polarization, scanning electron microscopy, and X-ray photoelectron spectroscopy. Molybdate and stannate in hybrid inhibitor could promote the passivation of steel and form a complex film, which could suppress the corrosion effectively. Moreover, the insoluble metal oxides in the complex film formed by three kinds of inorganic inhibitor could help the adsorption of CLS onto the steel surface. The CLS molecules could adsorb onto the steel surface and metal oxides to form an adsorption film to protect the steel from corrosion. A three-layer protection film formed by a hybrid inhibitor, including passivation film, deposition film, and adsorption film, would effectively inhibit the corrosion reactions on the steel surface. The CLS compound with molybdate with the ratio of 2:3 shows the best inhibition effect on both general corrosion and localized corrosion.

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“…Also, nitrite has been utilized in a synergistic function with other inhibitors, e.g., with molybdate to provide the oxidizing feature when there is a lack of sufficient oxygen within the solution . Nevertheless, the main risk of nitrite is related to the reduction in its concentration to less than what is required for an effective inhibition leading to pitting corrosion …”

Section: Introductionmentioning

confidence: 99%

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

Khani

Arefinia

2017

Materials & Corrosion

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The corrosion inhibition mechanism of sodium nitrite on carbon steel has been carefully studied in different simulated cooling water solutions by using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The obtained results showed that the corrosion inhibition increases by increasing the nitrite concentration up to 9 mM in 5 mM chloride solution at 25 °C. The corrosion state and corrosion current density are strongly depended upon the nitrite and chloride concentration, solution temperature, and applied potential. The interaction of nitrite with metal surface follows the Langmuir adsorption isotherm and the adsorption is as a physisorption process in a neutral solution.

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The inhibitive mechanisms of nitrite and molybdate anions on initiation and propagation of pitting corrosion for mild steel in chloride solution

Cited by 71 publications

References 41 publications

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

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

Study on Synergistic Corrosion Inhibition Effect between Calcium Lignosulfonate (CLS) and Inorganic Inhibitors on Q235 Carbon Steel in Alkaline Environment with Cl−

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

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