Electrochemical characterisation of the ability of dicarboxylic acid salts to the corrosion inhibition of mild steel in aqueous solutions

Rammelt, U.; Koehler, Sven P. K.; Reinhard, G.

doi:10.1016/j.corsci.2011.06.023

Cited by 42 publications

(36 citation statements)

References 26 publications

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“…The authors [19] suggest that the impedance spectra obtained on mild steel in a neutral aqueous solution can be interpreted using a simple equivalent circuit with two time constants in parallel that represents an imperfectly covered electrode. The high frequency time constant (R ad /C ad ) was attributed to the adsorption of an electrochemically indifferent substance.…”

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confidence: 99%

“…Recently it was found [19] that the adsorption ability of dicarboxylates is weak, but the corrosion protective effect could be improved considerably if mixtures of dicarboxylates with monocarboxylates are used. The additional inhibition effect was ascribed to the ability of monocarboxylates to adsorb stronger on the oxide-covered mild steel surface than dicarboxylates.…”

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confidence: 99%

“…The CPE element is related to surface inhomogeneity resulting from surface roughness, adsorption processes or porous layer formation. [19]. Here R el is the solution resistance; R ad and C ad are the resistance and capacity that characterize adsorption; R p and C are the charge transfer resistance and double layer capacity; and W is the Warburg impedance.…”

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confidence: 99%

“…Thus, Rammelt et al [19] used measurements of the dependence of the free corrosion potential E cor , anodic polarization of mild steel, and EIS to compare the corrosion protection of steel in aerated neutral solution (pH 7.5) by mono-(pelargonate n = 7, caprinate n = 8) and dicarboxylates (azelate n = 6, sebacate n = 8). 3 Although all the investigated carboxylates are efficient in the presence of air, the authors found no advantages of dicarboxylates over monocarboxylates.…”

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confidence: 99%

“…An important step in this research was made by using the well-known linear free-energy relationship (LFER) principle [13] to describe and predict the efficiency of corrosion inhibitors not only in the dissolution and passivation of metals or alloys, but also in the prevention of its local depassivation [1,14,15]. Over the past decade, the high passivating ability of various carboxylates and amino acids was proved not only for iron or low carbon steels [10,[16][17][18][19][20][21][22] but also for nonferrous metals [23][24][25][26][27][28][29].…”

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confidence: 99%

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Organic corrosion inhibitors: where are we now? A review. Part II. Passivation and the role of chemical structure of carboxylates

Kuznetsov

2016

Int. J. Corros. Scale Inhib.

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This article provides an overview of works (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016) devoted to the passivation of various metals and the influence of organic carboxylic acids and their salts thereon. The results of corrosion and electrochemical studies, as well studies on the composition and structural features of surface layers on the metals being protected by a variety of physicochemical methods are considered. Protection of metals by organic corrosion inhibitors (CIs) is based mostly on the adsorption of these compounds on a metal surface and subsequent formation of protective layers that minimizes access of corrosive ions to that surface. Adsorption can occur via electrostatic interaction of the CI with the metal substrate (physisorption), or it can involve charge sharing between the surface and CI (chemisorption), or combination of both interaction types can take place. Passivation of metals remains a central problem to be solved by the corrosion science. In the development of nanoindustry methods focused on creating ultrathin layers on metals capable of preventing the corrosion of the metals, an important role is played by surface passivation using CIs. Corrosion inhibitors can form passivating (often polymolecular) layers on metals but with thickness d < 10 nm, making them invisible to an unaided eye and keeping intact the decorative properties of a coated article's surface. This passivation can be done using volatile CIs from the vapor phase or nonvolatile CIs from aqueous solutions. Since metal passivation using conventional corrosion inhibitors of oxidizing type (e.g., nitrites, chromates) is seriously limited in practice due to environmental considerations, requirements for inhibiting formulations keep changing over time.The use of corrosion inhibitors in passivation has played a major role not only in the application of oxidants (chromates, nitrites, etc.) but also in adsorptive, often "oxideless" passivation that we discovered as early as in the mid-1970s [1]. As for corrosion inhibitors

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Organic corrosion inhibitors: where are we now? A review. Part II. Passivation and the role of chemical structure of carboxylates

Kuznetsov

2016

Int. J. Corros. Scale Inhib.

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Corrosion inhibition of carbon steel in aqueous solution of ammonium nitrate and urea

Starostin

Shter

Grader

2012

Materials and Corrosion

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The effect of diethanolamine (DEA) and hexamethylenetetramine (HMTA) on the corrosion of carbon steel (CS) in concentrated aqueous solution of ammonium nitrate and urea (ANU) was studied by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy. Both amines showed high inhibition efficiency >99% above a concentration of 0.5 wt% at 25 and 50 8C. The addition of 0.1-0.5 wt% sebacic acid to the tested solution containing amines did not enhance the inhibition efficiency. A positive synergistic effect was observed when 0.1-0.5 wt% of cinnamic acid was added to the ANU solution containing 0.3-1 wt% of amines. These results clearly demonstrate the potential of using CS for storage and transport of ANU solutions under ambient conditions.

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Effect of tartrate on the electrochemical behaviour and semiconductive properties of passive film on steel in saturated calcium hydroxide

Žulj

Serdar

Martinez

2015

Materials & Corrosion

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This paper presents results of the basic study on the inhibitive action of tartrate toward chloride‐induced corrosion on carbon steel rebar in alkaline environment. Modification of the electrochemical behaviour and semiconductive properties of passive film formed on steel surface in the presence of tartrate were characterised by a range of electrochemical techniques in saturated calcium hydroxide. In the presence of tartrate in saturated calcium hydroxide with addition of 0.14 M sodium chloride pitting corrosion initiation was postponed for 622 mV up to potentials of oxygen evolution reaction. The hypothesis on the competitive adsorption between the chloride ions and tartrate anion through the surface complex formation was applied on the studied system.

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Electrochemical characterisation of the ability of dicarboxylic acid salts to the corrosion inhibition of mild steel in aqueous solutions

Cited by 42 publications

References 26 publications

Organic corrosion inhibitors: where are we now? A review. Part II. Passivation and the role of chemical structure of carboxylates

Organic corrosion inhibitors: where are we now? A review. Part II. Passivation and the role of chemical structure of carboxylates

Corrosion inhibition of carbon steel in aqueous solution of ammonium nitrate and urea

Effect of tartrate on the electrochemical behaviour and semiconductive properties of passive film on steel in saturated calcium hydroxide

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