A study of organic substances as inhibitors for chloride-induced corrosion in concrete

Ormellese, Marco; Lazzari, Luciano; Goidanich, Sara; Fumagalli, G.; Brenna, Andrea

doi:10.1016/j.corsci.2009.08.018

Cited by 253 publications

(163 citation statements)

References 18 publications

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“…33 Os inibidores de corrosão podem atuar tanto no período inicial do tratamento ou no período de propagação, reduzindo a taxa de corrosão. 34 Inibidores de corrosão são compostos químicos normalmente utilizados em pequenas concentrações, sempre que um metal se encontra em contato com um meio agressivo. A presença de tais compostos, retarda o processo de corrosão, e mantém a sua taxa em um mínimo e, assim, evita perdas econômicas devido a corrosão metálica.…”

Section: Inibidores De Corrosãounclassified

The Corrosion and the Anticorrosion Agents

Frauches-Santos¹,

Albuquerque²,

Oliveira³

et al. 2014

Revista Virtual De Química

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Abstract:Corrosion is generally present in metal materials, especially when they are involved in several industrial activities. Their deterioration is induced by the physicochemical interaction between the metal and the corrosive environment, which causes great problems in several activities. The petrol sector is one of the most damaged as the constituents of perforation fluids and petroleum production water influence corrosion. Conventional anti-corrosion techniques are employed to prevent the loss of highly used industrial material; they include coatings, change of environment, cathodic and anodic protection and inhibitor treatments using organic compounds. Broadly speaking, this article describes the main anti-corrosion protection methods, corrosion in petroleum industry, and the anti-corrosion agents used in the industrial sector.Keywords: Corrosion; corrosion inhibitors; anti-corrosion protection; corrosion in petroleum industry. ResumoA corrosão está presente nos materiais metálicos em geral e, em especial, envolvidos nas diversas atividades industriais. A deterioração destes é causada pela interação físico-química entre o material e o meio corrosivo, onde causa grandes problemas nas mais variadas atividades. Um dos setores que mais se prejudica com a corrosão é o petrolífero devido a influencia de constituintes dos fluidos de perfuração e da água de produção. Para evitar as perdas dos materiais de elevado uso industrial, são utilizadas técnicas anticorrosivas que incluem os revestimentos, as técnicas de modificação do meio, a proteção catódica e anódica e, os inibidores de corrosão como a utilização de compostos orgânicos. Este artigo descreve, em linhas gerais, as principais técnicas de proteção anticorrosiva, a corrosão na indústria do petróleo e os agentes anticorrosivos utilizadas no meio industrial.Palavras-chave: Corrosão; inibidores de corrosão; proteção anticorrosiva; corrosão na indústria de petróleo.

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Section: Inibidores De Corrosãounclassified

The Corrosion and the Anticorrosion Agents

Frauches-Santos¹,

Albuquerque²,

Oliveira³

et al. 2014

Revista Virtual De Química

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“…• from 1999 to 2011 pure organic compounds have been studied, both in solution and in concrete (Series C) [45][46][47][48].…”

Section: Methodsmentioning

confidence: 99%

“…A first screening test (potentiodynamic test) was performed on about 80 organic compounds (mainly amines, amino-alcohols and carboxylates) in order to identify the best inhibiting substances [46].…”

Section: Organic Substancesmentioning

confidence: 99%

“…The performance of corrosion inhibitors for reinforced concrete structures has been studied at PoliLaPP, Laboratory of Corrosion of materials "P. Pedeferri" of the Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, in the last 15 years on commercial corrosion inhibitors, both mixed in (nitrite based and organic) and migrating [40][41][42][43][44] and on organic compounds, mainly amines, carboxylates and amino acids [45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

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Experiences on corrosion inhibitors for reinforced concrete

Bolzoni¹,

Brenna²,

Fumagalli³

et al. 2014

Int. J. Corros. Scale Inhib.

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Corrosion of carbon steel reinforcement is the most important cause of premature failure on reinforced concrete structures. Prevention of corrosion is primarily achieved in the design phase by using high quality concrete and adequate cover. Additional prevention methods are adopted when severe environmental conditions occur or on structures requiring very long service life. Among these methods, corrosion inhibitors seem to offer a simple and cost effective prevention technique. They may be used both as a preventative techniques, if added to fresh concrete, and as a repair system, if applied on hardened concrete.The performance of corrosion inhibitors for reinforced concrete structures affected by chloride induced and carbonation corrosion has been studied at PoliLaPP, Laboratory of Corrosion of materials "P. Pedeferri" of the Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, in the last 15 years.Organic commercial admixed corrosion inhibitors delayed the occurrence of chloride induced corrosion. This result is related to two effects: reduction of the rate of chloride transport into concrete and increase of the critical chloride threshold.Commercial migrating corrosion inhibitors (MCI) are able to delay time-to-corrosion of passive rebars in concrete subjected to chlorides ponding; this effect is mainly related to the reduction of chlorides diffusion coefficient. MCI can reduce the corrosion rate after corrosion initiation only in carbonated concrete, nevertheless efficiency is low and residual corrosion rate is not negligible.Commercial MCI can penetrate into concrete mainly through capillary sorption but penetration depth is limited to 20 mm.The results obtained with nitrite-based inhibitor confirm literature data: the inhibitor is effective if the molar ratio is higher than 0.5-0.6; in carbonated concrete, due to insufficient amount of inhibitor, no significant effect has been observed on corrosion rate.Among the tested organic substances, compounds containing carboxylic group showed the best results solution tests: pitting potential, time-to-corrosion and critical chloride content are similar to those obtained with sodium nitrite. In concrete tests, only one amine and one amino acid showed good performance increasing the critical chlorides Int. J. Corros. Scale Inhib., 2014, 3, no. 4, 254-278 255 threshold with respect to the reference condition. For carboxylate substances, a strong link was found between inhibiting properties and molecular structure.

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“…This paper, therefore, studies the corrosion behaviours of C. citratus leaf-extract and NaNO 2 on the corrosion of reinforcing-steel in concrete immersed in 3.5% NaCl medium (saline/marine simulating-environment). Also, because using admixtures exhibit potency of changing concrete properties [58,59], especially, via strength improvement/reduction [60], the compressive-strength effects of C. citratus and NaNO 2 admixtures on the studied steel-reinforced concrete were also investigated. [50], C. citratus used for the study had been freshly cut from Idiroko road, Canaanland, Ota, Nigeria, identified with FHI number 109497 by a professional Determinavit, dried at 20 ∘ C in well aerated room employing a 5-ton air-conditioning facility.…”

Section: Introductionmentioning

confidence: 99%

Cymbopogon citratusand NaNO₂Behaviours in 3.5% NaCl-Immersed Steel-Reinforced Concrete: Implications for Eco-Friendly Corrosion Inhibitor Applications for Steel in Concrete

Okeniyi

Popoola

Okeniyi

2018

International Journal of Corrosion

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This paper studies behaviours of Cymbopogon citratus leaf-extract and NaNO 2 , used as equal-mass admixture models, in 3.5% NaCl-immersed steel-reinforced concrete by nondestructive electrochemical methods and by compressive-strength improvement/reduction effects. Corrosion-rate, corrosion-current, and corrosion-potential constitute electrochemical test-techniques while compressive-strength effect investigations followed ASTM C29 and ASTM C33, in experiments using positive-controls for the electrochemical and compressive-strength studies. Analyses of the different electrochemical test-results mostly portrayed agreements on reinforcing-steel anticorrosion effects by the concentrations of natural plant and of chemical admixtures in the saline/marine simulating-environment and in the distilled H 2 O (electrochemical positive control) of steel-reinforced concrete immersions. These indicated that little amount (0.0833% cement for concrete-mixing) of Cymbopogon citratus leaf-extract was required for optimal inhibition efficiency, = 99.35%, on reinforcing-steel corrosion, in the study. Results of compressive-strength change factor also indicated that the 0.0833% Cymbopogon citratus concentration outperformed NaNO 2 admixture concentrations also in compressive-strength improvement effects on the NaCl-immersed steel-reinforced concrete. These established implications, from the study, on the suitability of the eco-friendly Cymbopogon citratus leaf-extract for replacing the also highly effective NaNO 2 inhibitor of steel-in-concrete corrosion in concrete designed for the saline/marine service-environment.

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A study of organic substances as inhibitors for chloride-induced corrosion in concrete

Cited by 253 publications

References 18 publications

The Corrosion and the Anticorrosion Agents

The Corrosion and the Anticorrosion Agents

Experiences on corrosion inhibitors for reinforced concrete

Cymbopogon citratusand NaNO₂Behaviours in 3.5% NaCl-Immersed Steel-Reinforced Concrete: Implications for Eco-Friendly Corrosion Inhibitor Applications for Steel in Concrete

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A study of organic substances as inhibitors for chloride-induced corrosion in concrete

Cited by 253 publications

References 18 publications

The Corrosion and the Anticorrosion Agents

The Corrosion and the Anticorrosion Agents

Experiences on corrosion inhibitors for reinforced concrete

Cymbopogon citratusand NaNO2Behaviours in 3.5% NaCl-Immersed Steel-Reinforced Concrete: Implications for Eco-Friendly Corrosion Inhibitor Applications for Steel in Concrete

Contact Info

Product

Resources

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Cymbopogon citratusand NaNO₂Behaviours in 3.5% NaCl-Immersed Steel-Reinforced Concrete: Implications for Eco-Friendly Corrosion Inhibitor Applications for Steel in Concrete