Electrochemical performance of reinforcing steel in alkali-activated slag extract in the presence of chlorides

Shi, Jinjie; Ming, Jing; Sun, Wei

doi:10.1016/j.corsci.2018.01.043

Cited by 79 publications

(23 citation statements)

References 48 publications

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“…The E corr for steel in test solution without inhibitor is about −300 mV SCE , and has almost no change after adding 500 ppm CLS into the test solution, which is consistent with previous research [ 1 ]. This result indicates that CLS act as a mixed-type corrosion inhibitor [ 24 , 25 ]. Meanwhile, after adding 500 ppm inorganic inhibitors, the E corr of steel slightly increases, and molybdate leads the largest increase of E corr .…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, after adding 500 ppm inorganic inhibitors, the E corr of steel slightly increases, and molybdate leads the largest increase of E corr . This result reveals that the tested inorganic inhibitors act as a mixed-type inhibitor [ 25 , 26 ] predominantly with anodic effectiveness [ 26 ]. The inhibition efficiency (IE%) was calculated by the following equation:

where i 0 corr and i corr represent the corrosion current density values in test solution without and with inhibitor, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the damage regions on passivation film acts as an anode, whereas the complete passivation film serves as a cathode. Accordingly, the electrochemical reactions that occurred on the steel surface when exposed to alkaline solutions are as follows [ 25 , 59 ]: Anodic reaction: Fe→Fe 2+ + 2e − Cathode reaction: O 2 + 2H 2 O + 4e − →4OH − Corrosion products formation: Fe 2+ + 2OH − →Fe(OH) 2 →Fe(OH) 3 …”

Section: Discussionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

where i 0 corr and i corr represent the corrosion current density values in test solution without and with inhibitor, respectively.…”

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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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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“…Considering the effect of inhibitors on capacitance, a substantial decrease in

C_{dl}

can be observed and the double‐layer capacitance can be expressed as follows:

{italicC}_{dl} = {italicY}_{0} {({italicω}_{max})}^{n −1},

where

ω_{max}

is the frequency at which the imaginary part of the impedance is at maximum. Generally, the decrease in

C_{dl}

is due to the reducing local dielectric constant for the displacement of water and/or thickening electric double layer . The CPE can be expressed as follows:

{italicZ}_{CPE} = {italicY}_{0}^{- 1} {(j ω)}^{- n},

where

Y_{0}

is the proportional factor,

normalω

is the angular frequency, j =

\sqrt{- 1}

and n is the phase shift which are regarded as a measure of the heterogeneity and roughness of the electrode surface.…”

Section: Resultsmentioning

confidence: 99%

“…Generally, the decrease in

C_{dl}

is due to the reducing local dielectric constant for the displacement of water and/or thickening electric double layer . The CPE can be expressed as follows:

{italicZ}_{CPE} = {italicY}_{0}^{- 1} {(j ω)}^{- n},

where

Y_{0}

is the proportional factor,

normalω

is the angular frequency, j =

\sqrt{- 1}

and n is the phase shift which are regarded as a measure of the heterogeneity and roughness of the electrode surface. While n = 0, the CPE represents a pure resistor; for n = 1, an inductor; and for n =+1, a pure capacitor.…”

Section: Resultsmentioning

confidence: 99%

New surfactants N‐alkyl‐N,N‐dimethyl‐N‐(3‐thienylmethylene)ammonium bromides: Preparation and anticorrosion evaluation

Chen

Jiang

Cheng

et al. 2019

Materials & Corrosion

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A new series of N‐alkyl‐N,N‐dimethyl‐N‐(3‐thienylmethylene)ammonium bromides (designated as NTA‐n, n = 8, 10, 12, 14, and 16) were synthesized. The electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization showed that NTA‐n could protect availably X70 steel from attack of HCl with an inhibition efficiency of about 95%. And the inhibition ability follows the following sequence: NTA‐8 < NTA‐10 < NTA‐12 < NTA‐14 < NTA‐16, suggesting that prolonging alkyl chain may enhance the inhibition capacity of the molecules. Theoretical investigation backs up well the experiment results. The correlation of theoretical calculation with the experiment results illustrated clearly double logarithmic relations between the corrosion current and the computed quantum chemical parameters such as the highest occupied molecular orbital energy ( E HOMO), energy gap (ΔE), molecular volume ( ν), electronegativity ( χ), the total energy of iron crystal with the adsorbed inhibitor molecule ( E total), the interaction energy of Fe (1 0 0) surface and inhibitor molecules ( E inhibitor), while an equation resembling Hammet relation was existed between the corrosion currents and the fraction of electrons transfer (ΔN). These linear correlations suggest the relation of the inhibitor structure with its inhibition activity: long alkyl chain and electron donating groups in NTA‐n will enhance the corrosion efficiency.

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Application of electrochemical methods for studying steel corrosion in alkali‐activated materials

Mundra

Samson

Masi

et al. 2023

Materials & Corrosion

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Alkali-activated materials (AAMs) are binders that can complement and partially substitute the current use of conventional cement. However, the present knowledge about how AAMs protect steel reinforcement in concrete elements is incomplete, and uncertainties exist regarding the application of electrochemical methods to investigate this issue. The present review by EFC WP11-Task Force 'Corrosion of steel in alkali-activated materials' demonstrates that important differences exist between AAMs and Portland cement, and between different classes of AAMs, which are mainly caused by differing pore solution compositions, and which affect the outcomes of electrochemical measurements. The high sulfide concentrations in blast furnace slag-based AAMs lead to distinct anodic polarisation curves, unusually low open circuit potentials, and low polarisation resistances, which might be incorrectly interpreted as indicating active corrosion of steel reinforcement. No systematic

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Electrochemical performance of reinforcing steel in alkali-activated slag extract in the presence of chlorides

Cited by 79 publications

References 48 publications

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

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

New surfactants N‐alkyl‐N,N‐dimethyl‐N‐(3‐thienylmethylene)ammonium bromides: Preparation and anticorrosion evaluation

Application of electrochemical methods for studying steel corrosion in alkali‐activated materials

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