Corrosion protection of steel with DMEA-based organic inhibitor

Rakanta, E.; Zafeiropoulou, Th.; Batis, G.

doi:10.1016/j.conbuildmat.2013.03.030

Cited by 75 publications

(25 citation statements)

References 11 publications

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“…However, despite the fact that the active principles are known, their composition is not defined, and the dosage of inhibitor required to prevent corrosion in relation to the chloride content is not always provided. Literature data record an increase in the critical chloride content up to a maximum 1.5% compared to the weight of cement [5,[10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Corrosion inhibitors for reinforced concrete structures: a study of binary mixtures

Brenna¹,

Bolzoni²,

Pedeferri³

et al. 2017

Int. J. Corros. Scale Inhib.

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Corrosion inhibitors are used to prevent or delay corrosion of steel reinforcement in concrete. Available commercial products are of inorganic nature based on sodium nitrite (acknowledged to be the most effective product), or organic mixtures based on amines, alkanolamines, fatty acids and carboxylic substances. During the last 15 years in our laboratories an intense experimental research aimed at identifying new organic substances or mixtures thereof that might have greater inhibiting effectiveness on corrosion by chlorides. This paper present the results of electrochemical tests carried out in alkaline solution, in the presence of chlorides, that were conducted on binary mixtures made with three substances (nitrite, DMEA and benzoate). Electrochemical tests (namely potentiodynamic and potentiostatic polarisation) were carried out. Some of the mixtures exhibited a marked synergistic effect in the potentiodynamic polarisation tests, with a clear-cut increase in the pitting potential. In potentiostatic polarisation the effect on the critical chloride concentration for the initiation of localised corrosion were limited.

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Section: Introductionmentioning

confidence: 99%

Corrosion inhibitors for reinforced concrete structures: a study of binary mixtures

Brenna¹,

Bolzoni²,

Pedeferri³

et al. 2017

Int. J. Corros. Scale Inhib.

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show abstract

“…In this method after measurement of open circuit potential (E OCP ) and its stabilization, small perturbation of potential applies (10 mV below to 10 mV above of the E OCP at low scan rate of 0.166mV/s). Generally, the plot of the applied potential versus the measured current is linear in this small range of potential and its slope is named as polarization resistance (Rp) [25].…”

Section: Evaluation Of the Corrosion Resistance Of The Coatingsmentioning

confidence: 99%

The new aspects of the anticorrosive ZnO@SiO 2 core–shell NPs in stabilizing of the electrolytic Ni bath and the Ni coating structure; electrochemical behavior of the resulting nano-composite coatings

Sharifalhoseini

Entezari

2015

Journal of Colloid and Interface Science

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“…Foi verificada uma redução das taxas de corrosão atingindo um índice de 98% [5]. Considerando o efeito em argamassas, Rakanta et al [16] ao estudar a ação inibidora do dimetilaminoetanol na proteção à corrosão de aço, verificaram a redução das taxas de corrosão em aproximadamente 50%, ao empregarem uma concentração de 1% de aditivo. O uso de 2 % de aditivo não mostrou aumento na ação inibidora.…”

Section: Aditivos Inibidores De Molibdato E Tungstatounclassified

Avaliação de inibidores de corrosão para estruturas de concreto armado

et al. 2017

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RESUMOA corrosão de armadura é um dos maiores problemas que reduzem a durabilidade das estruturas de concreto, causada, frequentemente, pelo processo de carbonatação e ataque de íons cloretos, presentes em ambientes agressivos e marinhos. Estima-se que 90% dos problemas patológicos em estruturas de concreto no mundo tem como consequência a corrosão de armadura. Dessa forma, a pesquisa por materiais com resistência a este processo de deterioração é fundamental para melhorar a durabilidade e a eficiência das estruturas de concreto. Neste contexto, foi estudado o efeito de três aditivos químicos, um comercial à base de sais de nitrito, o molibdato de sódio (MoNa 2 O 4 ) e o tungstato de sódio (Na 2 O 4 W.2H 2 O), utilizados nos teores de 1% e 2% em relação à massa de cimento. Foram preparados corpos de prova cilíndricos de argamassa (classe de resistên-cia de 30 MPa) com aço embebidos neste, para serem submetidos ao ensaio eletroquímico de polarização potenciodinâmica. A utilização do aditivo comercial não foi eficiente na redução das taxas de corrosão, porém, o efeito do tempo de cura, reduziu a taxa média de corrosão de 4,7 mm/ano aos 60 dias, para 1,6 mm/ano, aos 90 dias. Os melhores resultados foram obtidos para os aditivos de molibdato e tungstato, nos quais foi observado um índice de eficiência do aditivo de 50%, para adição de 1% de molibdato, e de 29%, para adição de 2% de tungstato. Palavras-chave: Corrosão, Concreto armado, Aditivos químicos. ABSTRACTConcrete reinforcement corrosion is one of the most important problems that diminish the durability of concrete structures, and it is often caused by the carbonation process and chloride ion attack in aggressive and marine environments. It is estimated that 90% of pathological problems affecting concrete structures worldwide lead to reinforcement corrosion. The research for materials with resistance to this deterioration process is fundamental to improve the durability and efficiency of concrete structures. In this context, the effect of three chemical additives, a commercial one based on nitrite salts, sodium molybdate (MoNa 2 O 4 ) and sodium tungstate (Na 2 O 4 W.2H 2 O), used in contents of 1% and 2% in relation to the cement mass. Cylindrical, steel embedded, mortar samples (30 MPa strength class) were submitted to the potentiodynamic polarization test. The use of commercial additive was not efficient in reducing corrosion rates, but the effect of curing time reduced the mean corrosion rate from 4.7 mm/year at 60 days to 1.6 mm/year, at 90 days. The best results were obtained for the tungstate and molybdate additives, in which the addition of 1% of molybdate additive presented an efficiency rate of 50%, while 2% of tungstate additive presented an efficiency rate of 29%.

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Corrosion protection of steel with DMEA-based organic inhibitor

Cited by 75 publications

References 11 publications

Corrosion inhibitors for reinforced concrete structures: a study of binary mixtures

Corrosion inhibitors for reinforced concrete structures: a study of binary mixtures

The new aspects of the anticorrosive ZnO@SiO 2 core–shell NPs in stabilizing of the electrolytic Ni bath and the Ni coating structure; electrochemical behavior of the resulting nano-composite coatings

Avaliação de inibidores de corrosão para estruturas de concreto armado

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