Efficiency of Amino Alcohols as Corrosion Inhibitors in Reinforced Concrete

Vyrides, Ioannis; Rakanta, E.; Zafeiropoulou, Theodosia; Batis, G.

doi:10.4236/ojce.2013.32a001

Cited by 25 publications

(11 citation statements)

References 20 publications

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“…Deanol has been used for corrosion prevention in concrete with mixed results. [4][5][6][7] The compound adsorbs through concrete resulting in the formation of a complex precipitate of protective film, which adsorbs onto the metal surface. This provides an impenetrable barrier to metal dissolution that acts to stifle cathodic and or anodic electrochemical corrosion reactions taking place at the metal/solution interface.…”

Section: Introductionmentioning

confidence: 99%

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

Loto

Popoola

2015

S.Afr.j.chem

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The influence of deanol on the corrosion behaviour of mild steel in dilute sulphuric acid with sodium chloride addition was studied by means of mass-loss, potentiodynamic polarization, electrode potential monitoring, scanning electron microscopy and statistical analysis. Results show that deanol performed excellently with a maximum inhibition efficiency of 97.9 % obtained from the mass loss technique and 98.23 % from the potentiodynamic polarization tests at the maximum deanol concentration evaluated. Polarization studies show that the amino alcohol is a cathodic type inhibitor. Adsorption of deanol on the steel surface was observed to obey the Langmuir and Frumkin adsorption isotherms. Scanning electron microscopy studies confirmed the corrosion protection property of deanol to be through adsorption on the mild steel surface while statistical evaluation showed the overwhelming influence and significance of inhibitor concentration on inhibition efficiency compared with exposure time. KEYWORDSOrganic compounds, metals, deanol, corrosion, sulphuric acid, inhibitor IntroductionMild steel has excellent mechanical properties. Its low cost allows for extensive use as the material of construction in petroleum industries, chemical processing plants, marine applications, boilers, refinery plants, extractive industries, etc. However, its application under these industrial conditions subjects it to rapid corrosion attack especially in applications involving the extensive use of sulfuric acid and other corrosive media due to their wide range of applications, including domestic acidic drain cleaner, electrolyte in lead-acid batteries and various cleaning agents.1 The most cost-effective and practical corrosion control technique for effectively preventing the occurrence or reducing the severity of corrosion is to alter the electrochemical nature of the environment with chemical compounds known as inhibitors.2,3 Effective corrosion inhibition is subject to the chemical composition, molecular structure and affinity of the inhibiting compound with the metallic alloy surface. Deanol has been used for corrosion prevention in concrete with mixed results. [4][5][6][7] The compound adsorbs through concrete resulting in the formation of a complex precipitate of protective film, which adsorbs onto the metal surface. This provides an impenetrable barrier to metal dissolution that acts to stifle cathodic and or anodic electrochemical corrosion reactions taking place at the metal/solution interface. This investigation aims to evaluate the corrosion inhibition properties of deanol on the electrochemical behaviour of mild steel in aqueous dilute sulphuric acid at ambient temperature of 25 °C.

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Section: Introductionmentioning

confidence: 99%

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

Loto

Popoola

2015

S.Afr.j.chem

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“…The specimens are then cured in potable water for 20 days. After normal curing period the specimens are shifted to saline tank containing 3.5 % NaCl solution for further curing [10]. This is done so the chloride ions will penetrate the concrete surface reaching for the steel bars thereby initiating corrosion.…”

Section: Casting and Curing Of Specimensmentioning

confidence: 99%

Effect of Surface Applied Organic and Inorganic Corrosion Inhibitors on Reinforced Steel in Concrete

Kumar,

Chalisey,

Saharan

et al. 2019

IJEAT

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This paper presents the results of an experimental investigation carried out to study the effect of surface applied organic and inorganic corrosion inhibitors on reinforced steel in concrete. The reinforcement bars were coated with Neem powder (organic inhibitor) and Zinc powder (inorganic inhibitor) as corrosion inhibitors. The samples of beams of size 100X100X640mm having 4 steel bars as reinforcement were prepared and cured in normal water for 15 days and in saline environment for 42 days. The inhibitors were applied in the form of 2 coats, 4 coats and blend of both. The grade of concrete used was M30. Half-cell Potential and Weight loss measurements were carried out to determine the efficiency of corrosion inhibitors [11]. The corrosion inhibition efficiency of controlled specimen and coated specimens were compared. From the results it was seen that samples with 4 coats of Neem showed 44% inhibition efficiency as compared to control specimens. Similarly specimens with two coats of Neem, four coats of Neem and Zinc also showed better corrosion inhibition efficiency. Highest weight loss was observed in case of control specimen. The study concludes that use of surface applied corrosion inhibitors prove efficient in enhancing the corrosion inhibition efficiency of concrete. Surface applied corrosion inhibitors provide protective layer to the reinforcement thereby protecting it from corrosion and increasing the durability of the structure. This type of technique of using corrosion inhibitors in concrete can be used in various structures such as buildings, bridges, sewage pipes, marine structures, abutments & piers, RCC roads which are subjected to harsh environmental conditions.

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“…The inhibitive action of steel with calcium nitrite is as follows [1,10]: [1,10,15,27,33]. But, at the same time, possible increase of corrosion rate in case of low dosage or the presence of cracks [16]. Also, increase in dosage resulted in a decrease of the setting time and lowers the compressive strength of concrete and corrosion process may get accelerated [10,32].…”

Section: Effect Of Anodic Cathodic and Mixed Inhibitors In Concretementioning

confidence: 99%

“…It has been reported that carboxylate and amino alcohol-based corrosion inhibitors show dual actions in concrete as the amines and alkanol amines adsorb on the metal surface and form a protective film against chloride [58,59], whereas the carboxylate ester compound reacts with calcium hydroxide, precipitates and blocks the pores of the concrete. This pore blocking property is said to be a secondary protection mechanism against reinforcement corrosion [16,18,44,58]. Furthermore, another study reported that some organic inhibitors adsorb better on the iron surface in the active state than in the passive state [60].…”

Section: Effect Of Organic Inhibitors In Concrete 21 Admixed Vs MImentioning

confidence: 99%

Corrosion Inhibitors for Reinforced Concrete: A Review

Lee¹,

Saraswathy²,

Kwon³

et al. 2018

Corrosion Inhibitors, Principles and Recent Applications

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The objective of the topic is to review the recent trends in corrosion inhibitors for reinforced concrete and their application in the laboratory and field conditions. Inhibitors are chemical substances which when added to the concrete in small concentrations will inhibit or prolong the time to initiation of corrosion in concrete structures. This chapter focuses on the type of inhibitors used in concrete based upon their mode of action and the way of application. The section deals with anodic, cathodic, mixed inhibitors; performance of admixed inhibitor vs. migrating/surface applied inhibitor and their evaluation studies; and electrochemical injection of corrosion inhibitor (EICI) in concrete and electrochemical chloride extraction techniques has been reviewed.

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Efficiency of Amino Alcohols as Corrosion Inhibitors in Reinforced Concrete

Cited by 25 publications

References 20 publications

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

Inhibition effect of deanol on mild steel corrosion in dilute sulphuric acid

Effect of Surface Applied Organic and Inorganic Corrosion Inhibitors on Reinforced Steel in Concrete

Corrosion Inhibitors for Reinforced Concrete: A Review

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