Adsorption of organic corrosion inhibitors on iron in the active and passive state. A replacement reaction between inhibitor and water studied with the rotating quartz crystal microbalance

Kern, P.; Landolt, D.

doi:10.1016/s0013-4686(01)00781-2

Cited by 83 publications

(48 citation statements)

References 37 publications

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“…The electrosorption properties of benzoic acid on metallic surfaces have been quite well studied from a fundamental point-of-view and for its inhibitory effect on corrosion of iron and steel (1,2). This molecule can be adsorbed through two adsorption centres either the aromatic ring or the carboxylic group (3).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behaviour of Benzoic Acid on Platinum and Gold Electrodes

2003

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A voltammetric and spectroscopic study of the adsorption and oxidation of benzoic acid on platinum and gold electrodes has been carried out in acid medium. The oxidation of benzoic acid depends on the surface structure of the platinum electrode. Benzoic acid is adsorbed through the carboxylate group in a two-fold coordination at potential above 0.4V/RHE on platinum electrodes and above 0.5V/RHE on gold electrode. However, at lower potential it is adsorbed through the aromatic ring. The analysis of the potential dependent band centre frequencies and integrated band intensities indicates that lateral interactions between adsorbed benzoate anions are the responsible of the frequency shift observed with increasing potential.On platinum electrodes benzoic acid is reduced to cyclohexanecarboxylic acid at low potentials and is oxidised to CO 2 , quinones and lactones, similarly to other aromatic compounds such as benzene. On gold electrodes, it is oxidised mainly to CO 2 .2

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Section: Introductionmentioning

confidence: 99%

Electrochemical Behaviour of Benzoic Acid on Platinum and Gold Electrodes

2003

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“…26,27 However, there are still conflicting opinions about the effectiveness of organic inhibitors on reinforcement corrosion protection; [28][29][30][31] different mechanisms are also reported: Some investigations illustrate that organic inhibitors are able to form an adsorbed layer on the steel surface, hindering steel dissolution. 32 It is also suggested that organic inhibitors can block the anodic and cathodic reactions. 21,33,34 Other authors report that organic inhibitors decrease the chloride content and chloride diffusion in concrete.…”

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confidence: 99%

Corrosion Performance of Carbon Steel in Simulated Pore Solution in the Presence of Micelles

Koleva

Wit

et al. 2011

J. Electrochem. Soc.

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This study presents the results on the investigation of the corrosion behavior of carbon steel in model alkaline medium in the presence of very low concentration of polymeric nanoaggregates ͓0.0024 wt % polyethylene oxide ͑PEO͒ 113 -b-PS 70 micelles͔. The steel electrodes were investigated in chloride-free and chloride-containing cement extracts. The electrochemical measurements ͑electrochemical impedance spectroscopy and potentiodynamic polarization͒ indicate that the presence of micelles alters the composition of the surface layers ͑i.e., micelles were indeed absorbed to the steel surface͒ and influences the electrochemical behavior of the steel, i.e., the micelles lead to an initially increased corrosion resistance of the steel whereas no significant improvement was observed within longer immersion periods. Surface analysis, performed by environmental scanning electronic microscopy, energy-dispersive x-ray analysis, and x-ray photoelectron spectroscopy, supports and elucidates the corrosion performance. The product layers in the micelles-containing specimens are more homogenous and compact, presenting protective ␣-Fe 2 O 3 and/or Fe 3 O 4 , whereas the product layers in the micelles-free specimens exhibit mainly FeOOH, FeO, and FeCO 3 , which are prone to chloride attack. Therefore, the increased "barrier effects" along with the layers composition and altered surface morphology denote for the initially increased corrosion resistance of the steel in chloride-containing alkaline medium in the presence of micelles. A well-known fact is that corrosion of steel reinforcement can cause reinforced concrete deterioration and thus affect civil structures durability.1,2 Logically, corrosion-related issues result in a significant economic loss. For example, in the United States, the annual direct cost of bridge infrastructure corrosion was estimated to be $8.3 billion, and the indirect cost was reported to be many times higher. 3In normal conditions, the reinforcing steel embedded in cementbased materials ͑i.e., cement paste, mortar, and concrete͒ is in a passive state because of the high alkalinity ͑pH = 12.6-13.5͒ of the pore solution and the cement paste, respectively. 4,5 However, corrosion can be initiated due to carbonation or chloride contamination. 6 Carbonation can result in a pH drop ͑to about 8-9͒ 7,8 in the pore solution of the bulk cementitious matrix, leading to a general corrosion of the reinforcing steel. In the event of chloride penetration and chloride arrival at the steel/cement paste interface, localized corrosion is initiated; the local pH can drop to even below 6, resulting in fast corrosion propagation. This will cause accelerated damage of the reinforcing steel and possible rapid failure of reinforced concrete. 9To minimize the corrosion processes, various methods and techniques are used. Among them, the polymer-based organic corrosion inhibitors are widely applied because they can provide an easy handling, cost-effective corrosion prevention, delaying corrosion initiation.10-14 The organic inh...

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“…These results should be ascribed to that the inhibitors can be adsorbed on the steel surface and form a protective layer which inhibited the corrosion of the steel samples. [8,9] Furthermore, compared to the steel sample in the system only with rebar inhibitor, the capacitance arc radius of the steel sample is larger in the system with PAE, illustrating the excellent rebar inhibitor control properties of PAE.…”

Section: B Cycle Performance Determinationmentioning

confidence: 97%

Poly Acrylic Acid Ethyl Acrylate as Smart Carrier for Rebar Inhibitor Delivery in Alkaline Condition

Feng

Li²,

Zhang³

et al. 2015

Proceedings of the 2nd International Conference on Civil, Materials and Environmental Sciences

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Abstract-With ethyl acrylate, acrylic acid as monomers, an intelligent carrier material (PAE) was synthesized, and its swelling properties at different pH values, its cycle characteristics as well as its release control performance for inhibitors in alkaline solution were studied. The results indicate that the synthesized material is sensitive to pH and has excellent cycle performance which is suitable for controlling drug delivery in the pH range from 10 to11.

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Adsorption of organic corrosion inhibitors on iron in the active and passive state. A replacement reaction between inhibitor and water studied with the rotating quartz crystal microbalance

Cited by 83 publications

References 37 publications

Electrochemical Behaviour of Benzoic Acid on Platinum and Gold Electrodes

Electrochemical Behaviour of Benzoic Acid on Platinum and Gold Electrodes

Corrosion Performance of Carbon Steel in Simulated Pore Solution in the Presence of Micelles

Poly Acrylic Acid Ethyl Acrylate as Smart Carrier for Rebar Inhibitor Delivery in Alkaline Condition

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