Electrochemical injection of organic corrosion inhibitors into concrete

Sawada, Shohei; Page, Christopher; Page, M.M.

doi:10.1016/j.corsci.2004.10.001

Cited by 71 publications

(44 citation statements)

References 8 publications

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“…Devido a esse fato, estudos relacionados à composição e durabilidade do concreto estão sendo constantemente realizados. [1][2][3][4][5][6][7][8] Para os autores Helene e Cascudo, 9,10 a corrosão das armaduras lidera a incidência das manifestações patológicas que ocorrem em estruturas de concreto. O fenômeno da corrosão, além de diminuir a seção dos vergalhões de aço, ainda causa a fissuração e deformações na estrutura devido à formação de óxidos e hidróxidos de ferro ao redor da barra.…”

Section: Introductionunclassified

“…7 Esses inibidores podem ser adicionados ao concreto fresco, para novas estruturas, ou migrar através do concreto após a cura. Os primeiros estudos estão focados na utilização de inibidores de corrosão como aditivos para o concreto, que mostram maior eficiência para aqueles à base de nitrito, devido às suas propriedades oxidantes e à sua capacidade de eliminar defeitos na camada passiva sobre o aço.…”

Section: Introductionunclassified

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Corrosion Inhibitor Efficiency Rating to Concrete in Environments Contaminated with CO2 and Chloride Ions

et al. 2017

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Abstract:The objective of this study was to evaluate, through electrochemical techniques, the behavior and efficiency of three corrosion inhibitors for concrete in marine environments and contamination from carbon dioxide (CO 2 ). The synthetic inhibitor of sodium nitrite (SN) and the commercial inhibitors nitrite salts (NIS) and organic and inorganic compounds (OIC) were tested at the concentrations of 2, 3 and 4% (m.V -1 ). Electrochemical tests were carried out to assess the effectiveness of inhibitors against corrosion caused by chloride ions along with the effect of carbon dioxide gas. In these tests, a simulated pore solution (SPS) was used, which represents the electrochemical characteristics of the concrete, adding chloride and bubbling the CO 2 gas until the achievement of a pH approximately 7. This procedure was used to simulate the carbonation of the concrete. In environments with CO 2 , where there was a drop in pH to around 7, the inhibitors NTS and SNI showed a small passivation domain. This occurred for the inhibitor SN in all tested concentrations and with the NIS inhibitor it occurred in concentrations above 2% (m.V -1 ). For the OIC inhibitor, the 1020 steel showed active dissolution in all tested concentrations, ie. is a passivation domain was not observed in these conditions with CO 2 gas. Impedance tests showed less resistance to polarization for the solutions with CO 2 and NaCl, in the absence and in the presence of inhibitors.Keywords: Carbonation; Concrete; Corrosion Inhibitors; Synthetic Pore Solution. ResumoO objetivo deste trabalho foi avaliar, através de técnicas eletroquímicas, o comportamento e a eficiência de três inibidores de corrosão para concreto em ambientes marinhos e com contaminação por dióxido de carbono (CO 2 ) para simular a carbonatação do concreto. O inibidor sintético nitrito de sódio (NTS) e os inibidores comerciais sais de nitrito (SNI) e compostos orgânicos e inorgânicos (COI) foram testados nas concentrações 2, 3 e 4% (m.V -1 ). Ensaios eletroquímicos foram realizados para avaliar a eficácia dos inibidores contra a corrosão causada por íons cloreto juntamente com o efeito de gás carbônico. Nestes testes, empregou-se uma solução simuladora de poros (SSP) que apresenta as características eletroquímicas do concreto, adicionando o cloreto e borbulhando o gás CO 2 até a obtenção de pH próximo de 7. Este procedimento foi utilizado para simular a carbonatação do concreto. Em ambientes com CO 2 , onde ocorreu a queda do pH para aproximadamente 7, os inibidores NTS e SNI apresentaram um pequeno domínio de passivação. Para o inibidor NTS isto ocorreu em todas as concentrações testadas e com o inibidor SNI ocorreu em concentrações acima de 2% (m.V -1 ). Para o inibidor COI, o aço 1020 apresentou dissolução ativa em todas as concentrações testadas, ou seja, não foi observado domínio de passivação nestas condições com o gás CO 2 . Os ensaios de impedância apresentaram menor resistência à polarização para as soluções com CO 2 e NaCl, na ausência e na presença de inibidores.

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Section: Introductionunclassified

Corrosion Inhibitor Efficiency Rating to Concrete in Environments Contaminated with CO2 and Chloride Ions

et al. 2017

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“…Inhibition for CO 2 corrosion of N80 steel by quaternary alkynoxymethyl amine (IMC-80-Q) and imidazoline in 3% NaCl solution was investigated under static and flowing conditions by using modified rotating disk apparatus (Jiang et al, 2005). They concluded that: In a related research, Sawada et al (2005) and Kubo et al (2007) electrochemically injected two organic base inhibitors (ethanolamine and quanidine) into saturated specimens of carbonated and non-carbonated concrete from external electrolytes under the influence of an electrical field applied between embedded steel cathodes and external anodes. The main conclusions of this investigation may be summarized as follows:…”

Section: Lateral Interaction Effectmentioning

confidence: 99%

Corrosion inhibitors for steel reinforcement in concrete: A review

Abdulrahman¹,

Ismail²,

Hussain³

2011

Sci. Res. Essays

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Inhibitors are added to concrete to improve its quality and integrity. In recent years the use of these inhibitors in producing high performance concrete has increased significantly as a result of aggressive environment. This report is based on the corrosion inhibitors used in concrete and also on the published literatures. Most authors agreed that reinforcement corrosion is the most important causes of premature failure of reinforced concrete structure worldwide and generate a great research concern due to its effects on global economy. The report presents information related to basic mechanism of corrosion protection methods to extend the service life of reinforced concrete structures which include inhibitors, sealers and barriers. Environmental sustainability issues concerning the present inhibitors being used were examined, viability and versatility of green inhibitors to concrete was also x-rayed.

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“…Besides, the electrochemical realkalisation method is developed to restore the alkalinity of the concrete around the reinforcement so as to stop the corrosion of reinforcement in carbonated concrete (Ribeiro et al 2013;Yeih and Chang 2005). In addition, investigations indicate that the reinforcement corrosion can be also mitigated by the electrical injection of corrosion inhibitor (Kubo et al 2013;Sawada et al, 2005), and the concrete expansion induced by the alkali-silica reaction (ASR) can be suppressed by the electrochemical penetration of lithium ions (Ueda et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Application of Electrodeposition Method in Upgrading Mortar Durability

Feng

Shan

et al. 2015

ACT

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Journal of AdvancedAbstract A novel electrodeposition method in which silicate ions are key materials, has been applied on mortar samples. The microstructures of electrodeposited mortar were observed using scanning electron microscopy (SEM), X-ray diffraction instrument (XRD), mercury intrusion porosimeter (MIP) and differential thermo-gravimetric analysis (DTG). The durability of electrodeposited mortar was evaluated by examining the resistance to carbonization, sulfate attack and chloride diffusion. The results indicate that the method can not only refine the pore structure, but also coat the surface of mortar. In comparison with the control mortar, the carbonization depth at the same carbonization time and the reduction in the compressive strength after the identical time of exposure to sodium sulfate solution for the electrodeposited mortar are decreased. In addition, the chloride diffusion coefficient is remarkably decreased by approximate three times. Based on these, the electrodeposition method is promising for the application in upgrading the durability of real concrete structure.

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Electrochemical injection of organic corrosion inhibitors into concrete

Cited by 71 publications

References 8 publications

Corrosion Inhibitor Efficiency Rating to Concrete in Environments Contaminated with CO2 and Chloride Ions

Corrosion Inhibitor Efficiency Rating to Concrete in Environments Contaminated with CO2 and Chloride Ions

Corrosion inhibitors for steel reinforcement in concrete: A review

Application of Electrodeposition Method in Upgrading Mortar Durability

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